Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 5    No. 2    June 1995

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MARTENSITE TRANSFORMATION OF A TiNiCu ALLOY
Zhang Yi; Jin Jialing; Ji Zhiqiang

Shanghai Iron and Steel Research Institute; Shanghai 200940

Abstract:The two-stage martensitic transformation B2-B19-B19' in a Ti49Ni41Cu10 alloy has been investigated by means of electrical resistivity, differential scanning calorimetry(DSC), elastic modulus, X-ray diffraction and TEM observation. The cubic B2-orthorhomic B19 transformation has significant transformation heat effect with clear and sharp DSC peaks in a narrow temperature range and is accompanied with a pronounced softening of the elastic modulus; but its resistivity change is minor. The orthorhomic B19 -monoclinic B19' transformation has small heat effect with diffuse DSC peaks over a wide temperature range and an obvious resistivity change.TEM observation reveals the twin substructure of B19' martensite, contrasting to the defect-free B19 martensite.The difference in transformation behaviour of the B2-B19 and the B19-B19' might be related to the different martensite lattice type and substructure. The comparison between ternary and binary alloys have been also discussed.

 

Key words: TiNiCu shape memory alloy two-stage martensitic transformation

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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