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Environmental effect on mechanical properties of TiAl base alloys

Published online by Cambridge University Press:  18 February 2016

Morihiko Nakamura ,
Kenki Hashimoto  and
Tokuzo Tsujimoto
Morihiko Nakamura
Affiliation:
National Research Institute for Metals, Meguro-ku, Tokyo 153, Japan
Kenki Hashimoto
Affiliation:
National Research Institute for Metals, Meguro-ku, Tokyo 153, Japan
Tokuzo Tsujimoto
Affiliation:
National Research Institute for Metals, Meguro-ku, Tokyo 153, Japan
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Extract

Mechanical properties of TiAl base alloys were studied with three-point bending tests in vacuum, air, and gaseous hydrogen. The TiAl-Mn and TiAl (50:50) alloys homogenized at 1273 K exhibited relatively good bend ductility (about 2.5–3.0%) in vacuum, and poor ductility (about 1%) in air and hydrogen. The Ti-rich and Al-rich TiAl alloys, which exhibited little ductility even in vacuum, hardly showed any environmental effect on ductility. These facts may suggest that the mechanical properties of TiAl base alloys are affected at room temperature by the laboratory air and hydrogen, and that plastic deformation plays an important role in environmental embrittlement of TiAl base alloys at room temperature.

Type
Research Article
Information
Journal of Materials Research , Volume 8 , Issue 1 , January 1993 , pp. 68 - 77
Copyright
Copyright © Materials Research Society 1993

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