Advertisement

Sadhana

, Volume 28, Issue 3–4, pp 677–693 | Cite as

Toughening and creep in multiphase intermetallics through microstructural control

  • A. K. Gogia
  • R. G. Baligidad
  • D. Banerjee
Article

Abstract

The lack of engineering ductility in intermetallics has limited their structural applications, in spite of their attractive specific properties at high temperatures. Over the last decade, research in intermetallics has been stimulated by the discovery of remarkable ductilisation mechanisms in these materials. It has however often been the case that the process of ductilisation or toughening has also led to a decrease in high temperature properties, especially creep. In this paper we describe approaches to the ductilisation of two different classes of intermetallic alloys through alloying to introduce beneficial, second phase effects. The Ti2AlNb based intermetallics in the Ti-Al-Nb system can be ductilised by stabilising thebcc phase of titanium into the structure. The principles of microstructural and compositional optimization developed to achieve adequate plasticity, while retaining creep properties of these alloys, are described. An entirely different approach has been successful in imparting plasticity to intermetallics based on Fe3Al. The addition of carbon to form the Fe3AlC0.5 phase imparts ductility, while enhancing both tensile and creep strength.

Keywords

Multiphase intermetallics multistructural control toughening creep 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Baligidad R G, Prakash U, Radhakrishna A, Ramakrishna Rao V, Rao P K, Ballai N R 1996aISIJ Int. 36: 1215Google Scholar
  2. Baligidad R G, Prakash U, Ramakrishna Rao V, Rao P K, Ballal N B 1996bISIJ Int. 36: 1448Google Scholar
  3. Baligidad R G, Prakash U, Ramakrishna Rao V, Rao P K, Ballal N B 1996cISIJ Int. 36: 1453Google Scholar
  4. Baligidad R G, Prakash U, Radhakrishna A 1997Mater. Sci. Eng. A231: 206Google Scholar
  5. Baligidad R G, Radhakrishna A, Prakash U 1998Mater. Sci. Eng. A257: 235Google Scholar
  6. Banerjee D 1994 InIntermetallic compounds -Principles and practise (eds.) J Westbrook, R L Fleischer (New York: John Wiley and Sons) p 91Google Scholar
  7. Banerjee D 1995Philos. Mag. A72: 1559Google Scholar
  8. Banerjee D 1997Prog. Mater. Sci. 42: 135CrossRefGoogle Scholar
  9. Banerjee D, Gogia A K, Nandy T K, Joshi V A 1988Acta Metall. 36: 871CrossRefGoogle Scholar
  10. Banerjee D, Gogia A K, Nandy T K, Muraleedharan K, Mishra R S 1993 InStructural intermetallics (eds) R Darolia, J J Lewandowski, C T Liu, P L Martin, D B Miracle, M V Nathal (Warrendale, PA: The Mater. Soc.) p 19Google Scholar
  11. Blackburn M J, Smith M P 1978 Research to conduct exploratory and analytical investigations of alloys. AFML-TR-78-18, USAGoogle Scholar
  12. Boehlert C J 1997 WL-TR-97-418, USAGoogle Scholar
  13. Carisey T, Germann L, Strudel J L, Vikas Kumar S, Nandy T K, Gogia A K, Banerjee D, Franchet J M, Gedou J Y 2000 Research in progress. Ecole Des Mines, Paris, France, DMRL, India, Snecma, FranceGoogle Scholar
  14. Chu F, Mitchell T E, Majumdar B, Miracle D, Nandy T K, Banerjee D 1997Intermetallics 5: 147CrossRefGoogle Scholar
  15. Gogia A K, Nandy T K, Banerjee D, Carisey T, Strudel J L, Franchet J M 1998Intermetallics 6: 74CrossRefGoogle Scholar
  16. Kamat S K, Gogia A K, Banerjee D 1998Acta Mater. 46: 239CrossRefGoogle Scholar
  17. Kerry S 1992 DRA Tech. Report 92019, UKGoogle Scholar
  18. Koss D A, Banerjee D, Lukasak D A, Gogia A K 1990 InHigh temperature aluminides and intermetallics (eds.) S H Whang, C T Liu, D P Pope, J O Steigler (Warrendale, PA: The Mater. Soc.) p 175Google Scholar
  19. McAndrew J P, Simcoe C R 1961 Development of a Ti-Al-Cb alloy for use at 1200F-1800F ASD-TR-61-466, USAGoogle Scholar
  20. McKamey C G, DeVan J H, Tortorelli P F, Sikka V K 1991J. Mater. Res. 6: 1779CrossRefGoogle Scholar
  21. Mishra R S, Nandy T K, Sagar P K, Gogia A K, Banerjee D 1996Trans. Indian Inst. Met. 49: 331Google Scholar
  22. Nandy T K, Banerjee D 1997 InStructural intermetallics (eds.) M V Nathal, R Darolia, C T Liu, P L Martin, D B Miracle, D B Miracle, R Wagner, M Yamaguchi (Warrendale, PA: The Mater. Soc.) p 777Google Scholar
  23. Palm M, Inden G 1995Intermetallics 3: 493CrossRefGoogle Scholar
  24. Rowe R G 1991US Patent 5 032 357, USAGoogle Scholar
  25. Sagar P K, Nandy T K, Gogia A K, Muraleedharan K, Banerjee D 1995Mater. Sci. Eng. 192/193: 799CrossRefGoogle Scholar
  26. Sikka V K 1997Int. Symp. on nickel and iron aluminides: Processing, properties, and applications (Materials Park, OH: ASM Int.) p. 361Google Scholar
  27. Stoloff N S 1998Mater. Sci. Eng. A258: 1Google Scholar

Copyright information

© Printed in India 2003

Authors and Affiliations

  • A. K. Gogia
    • 1
  • R. G. Baligidad
    • 1
  • D. Banerjee
    • 1
  1. 1.Defence Metallurgical Research LaboratoryHyderabadIndia

Personalised recommendations