4.7 Article

Martensitic and magnetic transitions in Ni2+xMnGa1-x ferromagnetic shape memory alloys

期刊

JOURNAL OF ALLOYS AND COMPOUNDS
卷 871, 期 -, 页码 -

出版社

ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2021.159480

关键词

Intermetallics; Magnetically ordered materials; Shape memory; Magnetic measurements; Phase diagrams; Phase transitions

资金

  1. Hirose International Scholarship Foundation
  2. Japan Society for the Promotion of Science (JSPS) in Japan [18K04685]
  3. Grants-in-Aid for Scientific Research [18K04685] Funding Source: KAKEN

向作者/读者索取更多资源

This study experimentally investigated the phase transitions of Ni2+xMnGa1-x alloys and constructed experimental phase diagrams for these alloys. The results show that there are remarkable composition dependencies for characteristic temperatures, such as Curie temperature and martensitic transition temperature, with increasing x. The study also observed magnetostructural coupling in a specific composition range.
This study experimentally investigates a series of phase transitions of ferromagnetic shape memory alloys, Ni2+xMnGa1-x, in the composition range 0.02 <= x <= 0.27. An experimental phase diagram of these alloys was constructed by the use of electrical resistivity, thermomagnetization, and thermoanalysis measurements, and compared with both the Ni-rich Ni2+xMn1-xGa and Mn-rich Ni2Mn1+yGa1-y alloy systems which have been extensively studied as proto-materials for ferromagnetic Heusler alloys. The comparison makes it clear that there are remarkable composition dependencies for the following characteristic temperatures. All three systems have the common property that Curie temperature decreases and martensitic transition temperature increases with increasing x till the both temperatures coincide each other. As for the magnetostructural coupling temperature, however, the Ni-rich system has a wide temperature range, and the Mn-rich system does not show signs of the magnetostructural coupling, whereas the magnetostructural coupling was observed in Ni2+xMnGa1-x alloys in the range 0.10 <= x <= 0.12 which has similar characteristics between the former two systems. The premartensitic transition temperature was also observed in Ni2+xMnGa1-x alloys; it reached the ambient temperature at x = similar to 0.04, the highest of the three alloy systems. In addition, an intermartensitic transition appeared in Ni2+xMnGa1-x alloys in the composition range 0.06 <= x <= 0.10, which showed a drastic change especially in the electrical resistivity. These characteristic temperatures are also compared in terms of the number of valence electrons among the Ni-Mn-Ga Heusler alloy systems, and the differences are clarified and discussed in detail. (C) 2021 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。

评论

主要评分

4.7
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据