Enhanced powder sintering of near-equiatomic NiTi shape-memory alloys using Ca reductant vapor

被引：34

作者：

Bertheville, B ^{[1
]}

Bidaux, JE ^{[1
]}

机构：

[1] Univ Appl Sci Western Switzerland, HEVs, Design & Mat Unit, CH-1950 Sion, Switzerland

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2005年 / 387卷 / 1-2期

关键词：

calciothermic reduction; powder metallurgy; sintering; shape-memory alloys; nickel-titanium;

D O I：

10.1016/j.jallcom.2004.06.079

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

An alternative powder metallurgical process (called VPCR process) for the fabrication of single-phase NiTi shape-memory alloys is presented. It is based on a vapor phase metallothermic reduction operating during the NiTi compound formation. This process allows to achieve high chemical homogeneity. It is effective not only for obtaining homogeneous near-equiatomic NiTi without undesirable oxides (Ti4Ni2Ox) and carbonitrides (TiC1-xNx), but also avoids the formation of other Ni-Ti intermetallics such as Ti2Ni, Ni4Ti3 and Ni3Ti. Furthermore, the produced near-equiatomic NiTi (Ti-50.2 at.% Ni) exhibits improved shape-memory effects associated with the reversible B2 <----> B19' transformation. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：211 / 216

页数：6

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