Segregation and microstructure evolution in chill cast and directionally solidified Ni-Mn-Sn metamagnetic shape memory alloys

被引：10
|
作者：
Czaja, P. [1 ]
Wierzbicka-Miernik, A. [1 ]
Rogal, L. [1 ]
机构：
[1] Polish Acad Sci, Inst Met & Mat Sci, 25 Reymonta St, PL-30059 Krakow, Poland
来源：
JOURNAL OF CRYSTAL GROWTH | 2018年 / 492卷
关键词：
Directional solidification; Segregation; Bridgman technique; Single crystal growth; Magnetic materials; INDUCED PHASE-TRANSFORMATION; HEUSLER-ALLOYS; MAGNETIC-PROPERTIES; MARTENSITIC-TRANSFORMATION; UNIDIRECTIONAL CRYSTAL; SINGLE-CRYSTAL; STRUCTURAL TRANSITIONS; CALORIC MATERIALS; GROWTH; ENTROPY;
D O I：
10.1016/j.jcrysgro.2018.04.006
中图分类号：
O7 [晶体学];
学科分类号：
0702 ; 070205 ; 0703 ; 080501 ;
摘要：
A multiphase solidification behaviour is confirmed for a range of Ni-rich and Ni-deficient Ni-Mn-Sn induction cast and directionally solidified (Bridgman) alloys. The composition variation is primarily linked to the changing Mn/Sn ratio, whereas the content of Ni remains largely stable. The partitioning coefficients for the Ni50Mn37Sn13 and Ni46Mn41.5Sn12.5 Bridgman alloys were obtained according to the Scheil equation based on the composition distribution along the longitudinal cross section of the ingots. Homogenization heat treatment performed for 72 h at 1220 K turned out sufficient for ensuring chemical uniformity on the macro- and microscale. It is owed to a limited segregation length scale due to slow cooling rates adopted for the directional solidification process. (C) 2018 Elsevier B.V. All rights reserved.
引用
收藏
页码：50 / 59
页数：10
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