Low temperature crystal structure of Ni-Mn-Ga alloys

被引：126
|
作者：
Wedel, B
Suzuki, M
Murakami, Y
Wedel, C
Suzuki, T
Shindo, D
Itagaki, K
机构：
[1] Tohoku Univ, Inst Adv Mat Proc, Aoba Ku, Sendai, Miyagi 9808577, Japan
[2] Tohoku Gakuin Univ, Fac Engn, Tagajo, Miyagi 9850873, Japan
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 1999年 / 290卷 / 1-2期
关键词：
martensites; crystal structure; Ni2MnGa; low temperature phases; shape memory alloy;
D O I：
10.1016/S0925-8388(99)00198-X
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：
Transmission electron microscope (TEM) observation at room temperature of the low temperature phase of Ni2.14Mn0.86Ga shows stress-induced 5 periodicity modulation along a pseudo-[111] cubic zone axis. On cooling to 173 K, the periodicity changes to 7. In stress-free areas, a [001] zone axis with new lattice parameters for the tetragonal phase was observed. The new lattice parameters are smaller by a factor of root 2 than the expected lattice parameters. A new model for the tetragonal compound Ni2MnGa and the non-stoichiometric phases was developed with the help of TEM data, X-ray powder diffraction measurements, and a computational simulation based on the X-ray powder diffraction patterns. (C) 1999 Published by Elsevier Science S.A. All rights reserved.
引用
收藏
页码：137 / 143
页数：7
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