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Processing and Characterization of Al2Ti/Al 3Ti Two-Phase Alloys

Published online by Cambridge University Press:  10 February 2011

M. J. Lukitsch  and
J. E. Benci
M. J. Lukitsch
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

Several buttons of each of three binary Ti-Al alloys containing nominally 70, 71 and 72 at.% Al were prepared from elemental Ti and Al by plasma arc-melting. One button of each composition was then either solution heat-treated, subjected to a two-step heat treatment, or hot forged. Each composition and material condition was then characterized using SEM/EDS and microhardness testing. The results show that while all three compositions have a predominantly two-phase, coarse microstructure in the as-cast condition, it is possible to produce an essentially single phase material through an appropriate solution heat treatment for the two lower Al content alloys. A fine two-phase microstructure can be achieved through an additional, lower temperature heat treatment step. The microhardness results show that the solution heat treatment reduced the hardness for all three compositions compared to the as-cast condition while hot forging as-cast samples increased hardness. The 70% Al alloy has the highest hardness for all four material conditions studied while the 71% Al alloy has the lowest hardness in three of the four material conditions.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 552: Symposium KK – High-Temperature Ordered Intermetallic Alloys VIII , 1998 , KK2.5.1
Copyright
Copyright © Materials Research Society 1999

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References

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