Sai Ramudu Meka
Associate professor
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Interests
Surface Engineering - Thermochemical surface treatments for steels, powder metallurgy, second-phase dispersion strengthened metal alloys, Solid State Phase Transformation
s.r.meka@mt.iitr.ac.in
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01332284860
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Educational Details
University of Stuttgart, Max Planck Institute for Metals Research, Stuttgart
2011
Ph.D, Thesis title: Nitriding of iron based binary and ternary alloys
IIT Kanpur
2007
M.Tech, Materials and Metallurgical Engineering
NITK, Surathkal
2002
B.E., Metallury
Miscellaneous
Journal publications

1.      A.S. Yadav, P.Kurnsteiner, E. Jaegle and S.R. Meka*, Nitridation and hydrogen reduction of Fe-2.3 wt% Al alloy powder, Powder Technology. Vol. 374, 2020, p 527-533.

  1. S.R.Meka*, A.Schubert, E.Bischoff and E.J. Mittemeijer, Unusual iron-nitride formation upon nitriding Fe-Si alloy, Metallurgical and Materials Transactions A. Vol. 51, 2020, p 3154-3166.
  2. V.M.Rajavel Muthaiah, S.R.Meka, B.Venkata Manoj Kumar*, Development of Dual Phase SiC/Si3N4 Nanostructures on Nanosized SiC particles, Philosophical Magazine Letters, Vol. 100, No.2, 2020, p 74-85.
  3. Nitin Kumar, G.P. Chaudhari, S.R.Meka*, Investigation of low temperature liquid nitriding conditions for 316 stainless steel for improved mechanical and corrosion response, Transactions of the Indian Institute of Metals, Vol. 73, 2020, p. 235-242.
  4. K.N. Sasidhar and S.R. Meka*, Natural air atmosphere induced surface directed spinodal decomposition in stainless steel, Corrosion Science, Vol. 166, 2020, 108433.
  5. K.N. Sasidhar and S.R. Meka*, Thermodynamic reasoning for colossal N supersaturation in austenitic and ferritic stainless steels during low-temperature nitridation, Scientific Reports,  volume 9, Article number: 7996 (2019) 
  6. K.N. Sasidhar and S.R. Meka*, Immiscibility regions in iron based ferritic solid solutions and their relevance to thermodynamics and kinetics of nitriding, Philosophical Magazine, Vol. 99, 2019, p 2152-2168.
  7. V.M.Rajavel Muthaiah, S.R.Meka, B.Venkata Manoj Kumar*, Processing of heat treated silicon carbide reinforced aluminium alloy composites, Materials and Manufacturing Processes, Vol. 34:3, 2019, p. 312-320.
  8. K.N. Sasidhar and S.R. Meka*, What causes the colossal C supersaturation of δ-ferrite in stainless steel during low-temperature carburization? Scripta Materialia, Vol. 162, 2019, p. 118-120.
  9. K.N. Sasidhar and S.R. Meka*, Spinodal decomposition during isothermal gas-solid equilibration – Its effects and implications, Acta Materialia, Vol. 161, 2018, p. 266-272.
  10. Z. Hegedus*, S.R. Meka and E.J. Mittemeijer. Insitu consolidation of ball milled metals,  Journal of Alloys and Compounds, Vol. 695, 2017, p. 721-725.
  11. T. Steiner*, S.R. Meka, H. Goehring and E.J. Mittemeijer. Alloying element nitride stability in iron-based alloys; denitriding of nitrided Fe–V alloys, Materials Science and Technology, Vol. 33, 2017, p 23-32.
  12. C.W. Kang, S.R. Meka*, T. Steiner, R.E. Schacherl and E.J. Mittemeijer. Microstructural evolution of 31CrMoV9 steel upon controlled gaseous nitriding treatment, HTM Journal of Heat Treatment and Materials, Vol. 71, 2016, p. 181-190.
  13. M. Akhlaghi*, S.R. Meka, E.A. Jaegle, S.J.B. Kurz, E. Bischoff and E.J. Mittemeijer. Formation mechanisms of alloying element nitrides in recrystallized and deformed ferritic Fe-Cr-Al alloy, Metallurgical and Materials Transactions A. Vol. 47, 2016, p. 4578-4593.
  14. M. Jung,  S.R. Meka* and E.J. Mittemeijer. Incubation time for iron-nitride layer formation upon gaseous nitriding of iron-based alloys, Philosophical Magazine. Vol. 96, 2016, p. 1369-1385.
  15. T. Steiner*, S.R. Meka, B. Rheingans, E. Bischoff, T. Wadenmaier, G. Yeli, T.L. Martin, P.A.J. Bagot, M.P. Moody and E.J. Mittemeijer. Continuous and discontinuous precipitation in Fe-1 at.%Cr-1 at.%Mo alloy upon nitriding; crystal structure and composition of ternary nitrides, Philosophical Magazine. Vol. 95, 2016. p 1509-1537.
  16. T. Steiner*, S.R. Meka, E. Bischoff, T. Waldenmaier and E.J. Mittemeijer. Nitriding of ternary Fe-Cr-Mo alloys; role of the Cr/Mo ratio, Surface and coatings technology. Vol. 291, 2016, p 21-33.
  17. M. Akhlaghi*, T. Steiner, S.R. Meka and E.J. Mittemeijer. Misfit induced changes of lattice parameters in two-phase systems: Coherent/incoherent precipitates in a matrix, Journal of Applied Crystallography, Vol. 49, 2016, p 69-77.
  18. M. Jung*,  S.R. Meka, B. Rheingans and E.J. Mittemeijer. Coupling inward diffusion and precipitation kinetics; the case of nitriding iron-based alloys, Metallurgical and Materials Transactions A. Vol. 47A, 2016, p 1425-1439.
  19. Z. Hegedus*, S.R. Meka and E.J. Mittemeijer. Crystallite growth in nanocrystalline tungsten; rate determining mechanism and the role of contaminations, Acta Materialia, Vol. 105, 2016, p 232-243.
  20. S.R. Meka*, A. Chauhan, T. Steiner, E. Bischoff, P.K. Ghosh and E.J. Mittemeijer. Generating duplex microstructures by nitriding; the nitriding of iron-based Fe-Mn alloy, Materials Science and Technology, Vol. 32, 2016, p 883-889.
  21. M. Akhlaghi*, M. Jung, S.R. Meka, M. Fonovic, A. Leineweber and E.J. Mittemeijer. Dependence of the nitriding rate of ferritic and austenitic substrates on the crystallographic orientation of surface grains; gaseous nitriding of Fe-Cr and Ni-Ti alloys, Philosophical Magazine. Vol. 95, 2015, p 4143-4160.
  22. M. Akhlaghi, T. Steiner, S.R. Meka*, A. Leineweber and E.J. Mittemeijer. Lattice-parameter change induced by accommodation of precipitate/matrix misfit; misfitting nitrides in ferrite, Acta Materialia, Vol. 98, 2015, p 254-262.
  23. T. Steiner, M. Akhlaghi,  S.R. Meka*and E.J. Mittemeijer. Diffraction-line shifts and broadenings in continuously and discontinuously coarsening precipitate-matrix systems; coarsening of initially coherent nitride precipitates in a ferrite matrix, Journal of Materials Science. Vol. 50, 2015, p 7075-7086.
  24. S. Loewy*, B. Rheingans, S.R. Meka and E.J. Mittemeijer. Modulated martensite-formation behavior in Fe-Ni based alloys; athermal and thermally activated mechanisms, Journal of Materials Research, Vol. 30, 2015, p 2101-2107.
  25. S.J.B. Kurz*, S.R. Meka, N. Schell, W. Ecker, J. Keckes, E.J. Mittemeijer. Residual stress and microstructure depth gradients in nitrided iron-based alloys revealed by dynamical cross-sectional transmission X-ray microdiffraction, Acta Materialia, Vol. 87, 2015, p 100-110.
  26. C.W. Kang, S.R. Meka*, R.E. Schacherl and E.J. Mittemeijer. Nitriding response of a quaternary iron-based Fe-2.82at.%Cr-0.13at.%Mo-0.18at.%V alloy, Metallurgical and Materials Transactions A. Vol. 46A, 2015, p 328-336.
  27. B. Schwarz,H. Göhring, S.R. Meka*, R.E. Schacherland E.J. Mittemeijer. Pore formation upon nitriding iron and iron-based alloys; the role of alloying elements and grain boundaries, Metallurgical and Materials Transactions A, Vol. 25A, 2014, p 6173-6186.
  28. S.R. Meka*, E. Bischoff, S.S. Hosmaniand E.J. Mittemeijer. Interrelationships of defects, nitride modification and excess nitrogen in nitrided Fe-4.75 at.% Al alloy, International Journal of Materials Research, Vol. 105, 2014, 11, p 1057-1066.
  29. B. Schwarz, P.J. Rossi, L. Straßberger, F. Jörg, S.R. Meka*, E. Bischoff, R.E. Schacherl, and E.J. Mittemeijer. Coherency strain and precipitation kinetics; crystalline and amorphous nitride formation in ternary Fe-Ti/Cr/V-Si alloys,  Philosophical Magazine, Vol. 94, 2014, 27, p 3098-3119.
  30. B. Schwarz, S.R. Meka*, R.E. Schacherl, E. Bischoff and E.J. Mittemeijer. Nitriding of Iron-based Ternary Fe-V-Si Alloy; The Precipitation Process of Separate Nitrides, Acta Materialia, Vol. 76, 2014, p 394-403.
  31. S. Loewy*, B. Rheingans, S.R. Meka and E.J. Mittemeijer. Unusual martensite-formation kinetics in steels: observation of discontinuous transformation rates, Acta Materialia, Vol. 64, 2014, p 93-99.
  32. H. Selg, E. Bischoff, S.R. Meka, R.E. Schacherl*, T. Waldenmaier and E.J. Mittemeijer. Molybdenum-nitride precipitation in recrystallized and cold rolled Fe-1at.%Mo alloy, Metallurgical and Materials Transactions A, Vol. 44A, 2013, p 4059-4070.
  33. J. Stein, R.E. Schacherl*, M. Jung, S.R. Meka, B. Rheingans and E.J. Mittemeijer. Solubility of nitrogen in ferrite; the Fe-N phase diagram, International Journal of Materials Research, Vol. 104,2013, 11, p 1053-1065.
  34. S.R. Meka* and E.J. Mittemeijer. Abnormal nitride morphologies upon nitriding iron-based substrates, JOM, Vol. 65, 2013, p 769-775.
  35. H. Selg, E. Bischoff, I. Bernstein, T. Woehrle, S.R. Meka*, R.E. Schacherl, T. Waldenmaier and E.J. Mittemeijer. Defect-dependent nitride surface-layer development upon nitriding of Fe-1 at.%Mo alloys, Philosophical Magazine, Vol. 93, 2013, p 2133-2160.
  36. H. Selg, S.R. Meka*, M. Kachel, R. Schacherl, T. Waldenmaier and E.J. Mittemeijer. Nitriding behaviour of maraging steel: experiments and modelling, Journal of Materials Science, Vol. 48, 2013, p 4321-4335.
  37. G.K. Rane, U. Welzel, S.R. Meka* and E.J. Mittemeijer. Non-monotonic lattice parameter variation with crystallite size in nanocrystalline solids, ActaMaterialia, Vol. 61, 2013, p 4524-4533.
  38. S.R. Meka*, E. Bischoff, B. Rheingans and E.J. Mittemeijer. Octapod-shaped, nanosized,amorphous precipitates in a crystalline ferrite matrix, Philosophical Magazine Letters, Vol. 93, 2013, p 238-245.
  39. S.R. Meka*, E. Bischoff, R.E. Schacherl and E.J. Mittemeijer. Unusual nucleation and growth of γ′ iron nitride upon nitriding Fe-4.75at.%Al alloy, Philosophical Magazine, Vol. 92, 2012, p 1083-1105.
  40. S.R. Meka*, K.S. Jung, E. Bischoff and E.J. Mittemeijer. Unusual precipitation of amorphous silicon nitride upon nitriding Fe-2at.%Si alloy, Philosophical Magazine, Vol. 92, 2012, p 1435-1455.
  41. K.S. Jung, S.R. Meka, R.E. Schacherl*, E. Bischoff and E.J. Mittemeijer. Nitride formation and excess nitrogen uptake upon nitriding ferritic Fe-Ti-Cr alloys, Metallurgical and Materials Transactions A, Vol. 43A, 2012, p 934-944.
  42. S.R. Meka*, R.E. Schacherl, E. Bischoff and E.J. Mittemeijer. Ideally weak nitriding kinetics during gaseous nitriding of Fe-2at.%Si alloy, HTM Journal of Heat Treatment and Materials, Vol. 66, 2011, p 103-108.
  43. S.R. Meka, S.S. Hosmani, A.R. Clauss and E.J. Mittemeijer*. The emergence and disappearance of a high density of microcracks in nitrided Fe-4.65at.%Al alloy, International Journal of Materials Research, Vol. 99, 2008, p 808-814.
Research projects as P.I.
  1. Nominated as head of the Max Planck Partner Group of Max Planck Institute for Iron Research, Dusseldorf, Germany at IIT Roorkee. For this activity Max Planck Society has provided 20000 Euro/year for first three years. After reviewing the research output of first three years, funding under this scheme has been extended for two more years making total project budget as 100000 Euro. Research work under this project is focused at fundamental understanding of gas/solid interaction with more emphasis on nitriding of steels. This project runs until the end of march 2022.
  2. SERB CRG project proposal titled “design of stainless steel chemistry for realization of colossal nitrogen supersaturation upon low temperature nitriding” has been approved with a budget of Rs. 67.9 lacs. This project duration is for 3 years and is expected to start from 2021.
  3. Global Institute for Materials Research Tohoku (GIMRT, Japan) proposal titled “Substitutional-Interstitial High Entropy Alloys” has been accepted. Under this, GIMRT supports travel and accommodation expenses of 400000 JPY for the visit to GIMRT to carry collaborative research work in 2021. 
  4. Faculty initiation grant of Rs. 10 lacs from IIT Roorkee was received to develop nitride dispersion strengthened steels. 
PhD guidance

1

Mr. K.N. Sasidhar (completed)

B.Tech:Metallurgical and Materials Engg.

Topic: metastable paraequilibrium states accessible during Gas/Solid equilibriation

Enrolled as a PhD student in July 2017

He is the recipient of prime minister research fellowship (PMRF)

2

Mr. Akeshwar Singh Yadav (ongoing)

B.Tech: Mechanical, M.Tech: Metallurgical and Materials Engg.

Topic: Aluminium-Nitride dispersion strengthened steels

Enrolled as a PhD student in December 2015

3

Mr. Devdutt Singh (ongoing)

B.Tech: Metallurgical Engg

Topic: Diffusional processes in photovoltaic solar cells

Enrolled as a PhD student in December 2016

Sponsored candidate from BHEL, Haridwar

4

Mr. Nitin (co-guide: Prof.G.P. Chaudhari) (ongoing)

B.Tech: Mechanical, M.Tech: Metallurgical and Materials Engg.

Title: Properties of Thermo-Mchano-Chemical surface treated stainless steels

Enrolled as a PhD student in Jan 2017

5

Ms. Amuth (ongoing)

B.Tech: Metallurgical and Materials Engg.

Topic: High nitrogen stainless steels

Recipient of prime minister research fellowship (PMRF)

Enrolled as a PhD student in July 2018

6

Mr.Subodh Rana (ongoing)

B.Tech:Metallurgical and Materials Engg.

Topic: Boriding of steels

Enrolled as a PhD student in Jan 2019

7

Ms.Anupama Kashyap (ongoing)

B.Tech:Mechanical Engg.  M.Tech: Materials Engg

Topic: oxidation and nitridation of stainless steels

Enrolled as a PhD student in Jan 2020

Achievements, awards and scholarships
  • Nominated to head Max Planck Partner Group of Max Planck Institute for Iron Research, Dusseldorf, Germany at IIT Roorkee
  • Academic Excellence Award from Indian Institute of Technology, Kanpur, India for the best performance in the Master’s program at IIT Kanpur during academic year 2006.
  • Recipient of IIT-DAAD Scholarship in 2006-2007 under which Master’s thesis work was carried out at Max Planck Institute for Intelligent Systems, Stuttgart, Germany.
  • Received scholarship from Max Planck Society during PhD research at Max Planck Institute for Intelligent Systems, Stuttgart.
  • S.R. Meka et al, Phil. Mag., Vol. 92, 2012, p 1083, runner-up for the 2012 James Clerk Maxwell Young Writers Prize. Paper was awarded the distinction of being highly commended.
  • Co-authored contribution, by T. Steiner, S.R. Meka, E. Bischoff, T. Waldenmaier and E.J. Mittemeijer,in European Conference on Heat Treatment and 21st IFHTSE Congress 2014 received the IFHTSE-Tom Bell Young Author award. Award was given to Mr. T. Steiner.
  • Best poster award at 26th International Symposium on Metastable, Amorphous and Nanostructured Materials (ISMANAM 2019: K.N.Sasidhar and S.R.Meka "isothermal stabilization of metastable states upon controlled gaseous nitriding"
Contributions in conferences and scientific meetings

1.      K.N. Sasidhar and S.R. Meka. Isothermal stabilization of metastable states upon controlled gaseous nitriding. Poster presentation at 26th International Symposium on Metastable, Amorphous and Nanostructured Materials (ISMANAM 2019), July 8-12, 2019, Chennai, India. Received Best Poster Award.

2.      K.N. Sasidhar, A.Kumar and S.R. Meka. Aluminium Partitioning Triggered by Inward Diffusing Carbon During Carburization of Fe2.3wt%Al Alloy, Oral presentation at the 14th International Conference on Diffusion in Solids and Liquids (DSL-2018), June 25-29, 2018, Amsterdam, The Netherlands.

3.      A.S. Yadav, J. Singh and S.R. Meka. Carburization Induced Phase Transformation in Fe-2wt.% Mn Alloys, Oral presentation at the 14th International Conference on Diffusion in Solids and Liquids (DSL-2018), June 25-29, 2018, Amsterdam, The Netherlands.

4.      S.R. Meka, A. Schubert, E.Bischoff and E.J. Mittemeijer. Development of Nitrides of Silicon and Iron upon Nitriding Fe-Si alloys, Oral presentation at the European Conference on Heat Treatment (ECHT 2018), April 12-13, 2018, Friedrichshafen, Lake Constance, Germany.

5.      A. S. Yadav, S. K. Rajulapati and S.R. Meka, Nitridation of Fe-2.3 wt.% Al alloy powder and its compaction by spark plasma sintering, oral presentation by A.S. Yadav at International Conference on Advances in Materials & Processing: Challenges & Opportunities” (AMPCO-2017), IIT Roorkee, Roorkee, 30th Nov. – 2nd December, 2017. Materials Today: Proceedings 5 (2018) 17239–17246.

6.      S. K. Rajulapati, A.D. Saggurthi A. S. Yadav, and S.R. Meka, Crystallite size and microstrain in mechanically alloyed and heat treated Fe-25 wt.% Y2O3, oral presentation by S.K. Rajulapati at International Conference on Advances in Materials & Processing: Challenges & Opportunities” (AMPCO-2017), IIT Roorkee, Roorkee, 30th Nov. – 2nd December, 2017. Materials Today: Proceedings 5 (2018) 16904–16911.

7.      S.R. Meka. Nitriding induced microstructural evolution in Iron-based alloys, invited oral presentation at International Conference on Recent Advances in Materials, Mechanical and Civil Engineering ICRAMMCE-2017, June 01 to June 02, 2017, Hyderabad, India.

8.      S.R. Meka. Stress and defects driven phase transformations, oral presentation at Heads of Max Planck Indian partner groups bi-annual-meeting 2017,  March 03 to March 05, 2017, IISER Mohali, Mohali, India.

9.      S.R. Meka. Nitriding of Iron-based alloys, Oral presentation at joint international conferences  emerging materials and processes for defense and infrastructure and advanced heat processing, organized by ASM International-India chapter, October 12 to October 14, 2016, Mumbai, India.

10.  T. Steiner, S.R. Meka, T. Waldenmaier and E.J. Mittemeijer. Internal nitriding of Fe-Cr-Mo alloys; Precipitation of mixed nitrides and role of the Cr/Mo ratio, Oral presentation by T. Steiner at ASM Heat Treat Society Conference & Exposition, October 20 to October 22, 2015. Detroit, USA.

11.  S. Loewy, B. Rheingans, S.R. Meka and E.J. Mittemeijer. Modulated martensite formation behavior in Fe-Ni steels. Oral presentation by S. Loewy at 10th European Symposium on Martensitic Transformations (ESOMAT), September 14 to September 18, Antwerp, Belgium.

12.  M. Akhlaghi, T. Steiner, S.R. Meka, A. Leineweber and E.J. Mittemeijer. Misfit induced changes of lattice parameters in two-phase systems: Coherent/incoherent precipitates in a matrix, poster presentation by M. Akhlaghi at International Conference on Solid-Solid Phase Transformations in Inorganic Materials (PTM 2015), June 28 to July 3, 2015, Whistler, BC, Canada.

13.  M. Jung, S.R. Meka, B. Rheingans and E.J. Mittemeijer. Simulation of simultaneously occurring coupled inward diffusion and internal precipitation, oral presentation by M. Jung at International Conference on Solid-Solid Phase Transformations in Inorganic Materials (PTM 2015), June 28 to July 3, 2015, Whistler, BC, Canada.

14.  S.R. Meka, A. Chauhan, T. Steiner and E.J. Mittemeijer. Development of austenite-martensite and ferrite-austenite duplex microstructure upon nitriding Fe-Mn alloys. Oral presentation at the European Conference on Heat Treatment and 22nd IFHTSE Congress, May 20-22, 2015, Venice, Italy.

15.  T. Steiner, S.R. Meka and E.J. Mittemeijer. Composition, crystalstructure and kinetics of formation of nitride precipitates in Fe-Cr-Mo alloys, oral presentation by T. Steiner at AWT (Arbeitsgemeinschaft Wärmebehandlung und Werkstofftechni) - Fachausschuss Nitrieren und Nitrocarburieren (Nitriding and Nitrocarburising Board of AWT), May 7, 2015, Gommern, Germany.

16.  T. Steiner, S.R. Meka, E. Bischoff, T. Waldenmaier and E.J. Mittemeijer. Internal nitriding of ternary Fe-Cr-Mo alloys; nitride development, oral presentation by T. Steiner at European Conference on Heat Treatment and 21st IFHTSE Congress, May 12-15, 2014, Munich, Germany.

17.  M. Akhlaghi, S.R. Meka, E. Bischoff and E.J. Mittemeijer. Low temperature nitriding of ferritic Fe-Cr-Al alloys, oral presentation by M. Akhlaghi at European Conference on Heat Treatment and 21st IFHTSE Congress, May 12-15, 2014, Munich, Germany.

18.  S.J.B. Kurz, S.R. Meka, N. Schell, J. Keckes and E.J. Mittemeijer.  Residual stress gradients in nitrided Iron-based alloys revealed by cross-sectional high-energy X-ray micro-diffraction, oral presentation by S.J.B. Kurz at 9th European Conference on Residual Stresses, July 7-9, 2014, Troyes, France.

19.  S. Loewy, B. Rheingans, S.R. Meka and E.J. Mittemeijer. Unusual martensite-formation kinetics in steels: observation of a series of transformation–rate maxima, oral presentation by S. Loewy at International conference on martensitic transformations, July 6-11, 2014, Bilbao, Spain.

20.  S.R. Meka, B. Rheingans, E. Bischoff and E.J. Mittemeijer.Unusual Octapod-shaped, Nanosized Amorphous Silicon-nitride Particles in a Crystalline Ferrite Matrix, Poster presentation at the international conference, 2013 MRS Spring Meeting & Exhibit, April 1-5, 2013, San Francisco, USA.

21.  S.R. Meka and E.J. Mittemeijer. Thermodynamics and kinetics of the competition of internal and external precipitation; morphology, constitution and structure of iron nitrides grown on iron-based alloy substrates, Oral presentation at the international conference, 2013 E- MRS Spring Meeting, May 27-31, 2013, Strasbourg, France.

22.  S.R. Meka, E. Bischoff, B. Rheingans, R.E. Schacherland E.J. Mittemeijer. Anomalous nitriding behaviour of Iron-based Fe-Si alloys, oral presentation at AWT (Arbeitsgemeinschaft Wärmebehandlung und Werkstofftechni) - Fachausschuss Nitrieren und Nitrocarburieren (Nitriding andNitrocarburising Board of AWT), November 27, 2013, Issum, Germany.

23.  S.R. Meka, E. Bischoff, B. Rheingans and E.J. Mittemeijer.The development of amorphous and crystalline nanoparticles of silicon nitride in ferrite; role of interfacial energy and elastic anisotropy upon phase transformation, Oral presentation at the international conference, Materials Science and Engineering 2012, September 25-27, 2012, Darmstadt, Germany.

24.  S.R. Meka. Unusual phase-transformation phenomena during nitriding of iron-based alloys, Oral presentation during meeting of board of trustees, Max Planck Institute for Intelligent Systems, Stuttgart. November 17, 2010, Stuttgart, Germany.

25.  S.R. Meka, E. Bischoff, R.E. Schacherl and E.J. Mittemeijer. Influence of lattice defects on nucleation and growth of different modifications of nanoprecipitates of AlN in nitrided Fe-Al alloy, Oral presentation at the international conference, Materials Science and Engineering 2010, August 24-26, 2010, Darmstadt, Germany.

26.  S.R. Meka, R.E. Schacherl, E. Bischoff and E.J. Mittemeijer.Internal gaseous nitriding of Fe-2at%Si alloy: Ideally weak nitriding interaction and formation of amorphous silicon-nitride precipitates, Oral presentation at European Conference on Heat Treatment 2010: Nitriding and Nitrocarburising, April 29-30, 2010, Aachen, Germany.

27.  S.R. Meka, R.E. Schacherl, E. Bischoff and E.J. Mittemeijer. Unusual microstructural development upon gaseous nitriding of Fe-4.65at.% Al alloy, Poster presentation at THERMEC 2009, International conference on processing and manufacturing of advanced materials, August 25-29, 2009, Berlin, Germany. Advanced Materials Research, Vol. 89-91, 2010, p 371-376.

28.  S.R. Meka. Unusual microstructural development during nitriding of iron-based Fe-Al alloy, oral presentation at AWT (ArbeitsgemeinschaftWärmebehandlung und Werkstofftechni) - FachausschussNitrieren und Nitrocarburieren (Nitriding and Nitrocarburising Board of AWT), September 17, 2009, Wels, Austria