Transformation behavior of sintered porous NiTi alloys

被引：23

作者：

Li, BY ^{[1
]}

Rong, LJ ^{[1
]}

Luo, XH ^{[1
]}

Li, YY ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Met Res, Atom Imaging Solids Lab, Shenyang 110015, Peoples R China

来源：

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 1999年 / 30卷 / 11期

关键词：

D O I：

10.1007/s11661-999-0112-y

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

TiH2 powder is added as a reactant and pore-forming agent to produce porous NiTi shape-memory alloys (SMAs). The transformation behavior of porous NiTi alloys is investigated because it is relevant to the engineering and medical applications of SMAs. It is found that the transformation behavior of porous NiTi alloys is different from that of cast NiTi alloys. It is demonstrated for the first time, by in situ X-ray diffraction (XRD), that there is no R-phase transformation in porous NiTi alloys, and a broadened, two-peak phenomenon observed with a differential scanning calorimeter (DSC) is not associated with R-phase transformation. The characteristic transformation temperatures of porous NiTi alloys are independent of sintering temperature, sintering time, TiH2 content, and the heating/cooling rate during thermal cycling between +123 and +423 K. Further, the latent heats of transformation are associated with the TiH2 content and the sintering conditions.

引用

页码：2753 / 2756

页数：4

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