MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Internal Defects of B19’ Martensite via R-Phase in Ti-Ni-Fe and Thermally Cycled Ti-Ni Alloys
Tomohiro NishiuraMinoru Nishida
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2009 Volume 50 Issue 5 Pages 1219-1224

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Abstract

Crystallography and morphology of B19’ martensite via R phase transformation in Ti-Ni-Fe alloy have been investigated by X-ray diffraction and transmission electron microscopy. The microstructure aspects of the B19’ martensite in the solution treated Ti-Ni-Fe alloy was the same as those in the solution treated binary Ti-Ni alloy. In the thermal cycled Ti-Ni-Fe alloy, the (001)B19’ compound twins frequently observed were the same as those in the thermal cycled binary Ti-Ni alloy. It is considered that the (001)B19’ compound twin was a kind of deformation twin to reduce the internal stress due to dislocations introduced during the thermal cycle, rather than a lattice invariant shear of the R to B19’ transformation.

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© 2009 The Japan Institute of Metals and Materials
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