Powder sintering and shape-memory behaviour of NiTi compacts synthesized from Ni and TiH2

被引：52

作者：

Bertheville, B ^{[1
]}

Neudenberger, A ^{[1
]}

Bidaux, JE ^{[1
]}

机构：

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

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2004年 / 384卷 / 1-2期

关键词：

powder metallurgy (PM); sintering; hot isostatic pressing (HIP); shape-memory alloys (SMA); NiTi;

D O I：

10.1016/j.msea.2004.06.025

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The use of TiH2 to produce NiTi shape-memory alloys from elemental powders is investigated. Mixtures of Ni and TiH2 powders are cold-pressed and sintered in vacuum or under protective atmosphere. Some of the sintered NiTi compacts are subjected to an additional post-HIP treatment to further increase their density. Post-HIPped NiTi compacts with approximately 7% porosity are obtained. A detailed characterization of the microstructure of the compacts is carried out using X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) analysis. The phase transformation behaviour is studied by differential scanning calorimetry (DSC). The specimens present significant shape-memory effects. A recovery strain of up to 1.6% is reached under a stress of 120 MPa. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：143 / 150

页数：8

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