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Environmental Effects on the Room Temperature Ductility of Polysynthetically Twinned (PST) Crystals of Binary and Some Ternary TiAl Compounds

Published online by Cambridge University Press:  01 January 1992

M. H. Oh ,
H. Inui ,
M. Misaki ,
M. Kobayashi  and
M. Yamaguchi
M. H. Oh
Affiliation:
Department of Metal Science and Technology, Kyoto University, Sakyo-ku, Kyoto 606, Japan.
H. Inui
Affiliation:
Department of Metal Science and Technology, Kyoto University, Sakyo-ku, Kyoto 606, Japan.
M. Misaki
Affiliation:
Department of Metal Science and Technology, Kyoto University, Sakyo-ku, Kyoto 606, Japan.
M. Kobayashi
Affiliation:
Department of Metal Science and Technology, Kyoto University, Sakyo-ku, Kyoto 606, Japan.
M. Yamaguchi
Affiliation:
Department of Metal Science and Technology, Kyoto University, Sakyo-ku, Kyoto 606, Japan.
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Abstract

Environmental effects on the room temperature ductility of polysynthetically twinned (PST) crystals of binary and some ternary TiAl compounds have been investigated through tensile tests conducted in four different atmospheres. The tensile ductility of TiAl PST crystals is sensitive to test environment. It is higher when tested in vacuum or in dry air than in air or in hydrogen gas. The environmental loss in ductility of PST crystals decreases with increasing strain rate. The environmental embrittlement of binary TiAl PST crystals can be interpreted in terms of hydrogen embrittlement. The ternary TiAl PST crystals containing Cr, Mo or Mn exhibit higher ductility than the binary TiAl PST crystals when tested in air, while the ternary ones show lower ductility than the binary ones in vacuum. Additions of alloying elements such as Cr, Mo and Mn seem to be effective in reducing the environmental loss in ductility of TiAl PST crystals.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 288: Symposium L – High-Temperature Ordered Intermetallic Alloys V , 1992 , 1001
Copyright
Copyright © Materials Research Society 1995

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References

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