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Deformation of Polysynthetically Twinned (PST) TiAl Crystals at High Strain Rate and High Temperature

Published online by Cambridge University Press:  15 February 2011

Zhe Jin ,
George T. Gray III  and
Masaharu Yamaguchi
Zhe Jin
Affiliation:
Los Alamos National Laboratory, Materials Science and Technology Division, Los Alamos, NM 87545, USA
George T. Gray III
Affiliation:
Los Alamos National Laboratory, Materials Science and Technology Division, Los Alamos, NM 87545, USA
Masaharu Yamaguchi
Affiliation:
Kyoto University, Department of Metal Science and Technology, Sakyo-ku, Kyoto 606, Japan
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Abstract

Deformation microstructures in a 45°<321> oriented (the lamellar interface was tilted 45° from the loading axis about the <321> direction in the lamellar interface) poly synthetically twinned (PST) TiAl crystal deformed in compression at 3000 s-1 and 800 °C was studied. Deformation of this PST crystal is characterized as follows: 1) Deformation of domains [III] and [IV] is dominated by 1/6 [112] parallel twinning (twinning parallel to lamellar interfaces). Ordinary dislocations observed in these domains are found to be a complementary deformation mode. 2) Deformation of domains [II], [V] and [VI] is controlled by a 1/2<110] ordinary dislocation slip. Complementary deformation modes in these domains are ordinary dislocation slip, superdislocation slip and cross-twinning. 3) Domain [I] is not deformed after the specimen deforms up to ∼7% strain.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 460: Symposium Z – High-Temperature Ordered Intermetallic Alloys VII , 1996 , 189
Copyright
Copyright © Materials Research Society 1997

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References

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