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01-07-2007 | Issue 14/2007

Journal of Materials Science 14/2007

Effect of Y addition on microstructure and martensitic transformation of a Ni-rich Ti–Ni shape memory alloy

Journal:
Journal of Materials Science > Issue 14/2007
Authors:
A. L. Liu, J. H. Sui, Y. C. Lei, W. Cai, Z. Y. Gao, L. C. Zhao

Abstract

In the present work, 1 at% Y was added to Ti-50.7at%Ni alloy to prepare Ti-50.2Ni-1Y alloy and the effects of rare earth Y addition on the microstructure and martensitic transformation behavior of Ti-50.7at%Ni alloy was investigated by optical microscope, scanning electronic microscope (SEM) X-ray diffraction (XRD) and differential scanning calorimetry (DSC). The results show the microstructure of Ti-50.2Ni-1Y alloy is different with that of Ti-50.7at.%Ni alloy, and its microstructure consists of B19′martensite and the Y-rich phase, which may be YNi phase. One-step martensitic transformation occurs in Ti-50.2Ni-1Y ternary alloy. The phase transformation temperatures increase rapidly with Y addition, and the increase of Ms is about 85°C.

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