期刊
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
卷 438, 期 -, 页码 1065-1070出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2006.02.187
关键词
NiMnGa; shape memory alloy; martensitic transformation; grain refinement; Fe alloying
The relationship among the composition, structure and martensitic transformation temperatures have been studied in detail for Ni50-xMn25Ga25-x, (at.%) alloys by optical and transmission election microscopy, X-ray diffraction and differential scanning calorimeter measurements. The martensitic transformation temperatures almost linearly increase with increasing Ni content up to 670 K showing their potentials as high-temperature shape memory alloys. The results show that the tetragonality ratio (c/a) increases with the Ni substitution for Ga, but the unit-cell volume reduces simultaneously. The martensitic transformation characteristics of Ni54Mn25Ga21 alloy with single martensite phase show excellent stability during thermal cycles or aging. The polycrystalline Ni54Mn25Ga21 alloy exhibited a shape-memory effect of 4.2% and compressive strain larger than 10% by using grain refining technique. Addition of Fe as a fourth element is an effective method to improve the mechanical properties, especially plasticity of polycrystalline Ni-Mn-Ga alloy due to the precipitation of gamma-phase. A compressive strain of 30% and a shape-memory effect of 2.8% are obtained for Ni56Mn17Fe8Ga19 alloy. (c) 2006 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据