A new precipitate phase in a TiNiHf high temperature shape memory alloy

被引：86
|
作者：
Han, XD
Wang, R
Zhang, Z
Yang, DZ
机构：
[1] Chinese Acad Sci, Beijing Lab Electron Microscopy, Beijing 100080, Peoples R China
[2] Dalian Univ Technol, Dept Mat Engn, Dalian 116024, Peoples R China
[3] Wuhan Univ, Dept Phys, Wuhan 430072, Peoples R China
来源：
ACTA MATERIALIA | 1998年 / 46卷 / 01期
基金：
中国国家自然科学基金;
关键词：
D O I：
10.1016/S1359-6454(97)00187-0
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A precipitate phase in a Ti36.5Ni48.5Hf15 high temperature shape memory alloy aged at 873K for 150 h has been studied by transmission electron microscopy (TEM) and high resolution electron microscopy (HREM). The precipitate phase of the approximate composition of (Ti0.6Hf0.4)Ni is identified to be face-centered orthorhombic lattice with lattice parameters A = 1.287nm, B = 0.874nm and C = 2.622 nm and space group F2/d 2/d 2/d.. The lattice correspondence between the precipitate phase and B2 matrix is determined to be A = 4.17c, B = 2(a + b) and C = 6(-a + b), where A, B and C are the basis vectors of the precipitate phase and a, b and c are those of the B2 matrix. The precipitate has an oblate spindle like shape with its habit plane being the (100)(P) parallel to(001)(B) plane. Six orientation variants and translation domains have been observed. These variants are related by those symmetry operations which belong to the BZ matrix but are lost in the precipitate phase. (C) 1997 Acta Metallurgica Inc.
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页码：273 / 281
页数：9
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