Affiliation:
1. Toyota Technological Institute
Abstract
Tensile test of TiAl alloy was carried out in 700oC gas environment(H2, pure air, Ar,
vacuum) at three strain rates, 2.8x10-4, 2.8x10-5, and 2.8x10-6s-1. With decreasing strain rate, the
ultimate tensile strength decreased in all environments similarly. However, elongation to fracture
differed from each environment. With decreasing strain rate, the elongation to fracture in vacuum
and Ar increased slightly, that in H2 increased much and that in pure air significantly. The reasons
of such behaviour are not known. One of the reasons for high elongation to fracture would be
formation of multiple microcracks in H2 and pure air on the gauge surface of the specimen during
tensile deformation.
Publisher
Trans Tech Publications, Ltd.
Subject
Mechanical Engineering,Mechanics of Materials,General Materials Science
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