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Fracture Toughness of Stoichiometric, Non-Stoichiometric and Ternary-Alloyed Al2Ti

Published online by Cambridge University Press:  15 February 2011

J. C. Ma ,
M. J. Lukitsch ,
C. E. Ambrow  and
J. E. Benci
J. C. Ma
Affiliation:
Materials Science and Engineering, Wayne State University, Detroit, MI 48202
M. J. Lukitsch
Affiliation:
Materials Science and Engineering, Wayne State University, Detroit, MI 48202
C. E. Ambrow
Affiliation:
Materials Science and Engineering, Wayne State University, Detroit, MI 48202
J. E. Benci
Affiliation:
Materials Science and Engineering, Wayne State University, Detroit, MI 48202
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Abstract

Polycrystalline stoichiometric Al2Ti was produced via casting or powder metallurgy and further processed yielding material in six conditions. The fracture toughness of the six material conditions was determined from the critical load to initiate cracks with a Vickers indenter. The results show a strong dependence on material condition. Powder processed Al2Ti exhibits the highest fracture toughness value among the material conditions studied.

Polycrystalline non-stoichiometric Al2±yTi1±y and ternary-alloyed Al2Ti + X were prepared in as-cast and cast & annealed conditions. Each material condition exhibited a multiphase microstructure. The composition of the phases present in each alloy was analyzed with SEM/EDS. Fracture toughness values of cast & annealed stoichiometric and non-stoichiometric binary alloys are 20–30% greater than as-cast stoichiometric Al2Ti. For the ternary alloys, the fracture toughness values show a strong dependence on the ternary element used and heat treatment condition. The fracture toughness values of three hot forged ternary alloys were also determined.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 460: Symposium Z – High-Temperature Ordered Intermetallic Alloys VII , 1996 , 115
Copyright
Copyright © Materials Research Society 1997

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References

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