Effect of directional solidification rate on the solidified morphologies and phase transformations of Ni50.5Mn25Ga24.5 alloy

被引：8

作者：

Liu, Junyi ^{[1
]}

Wang, Jingmin ^{[1
]}

Zhang, Hongbo ^{[2
]}

Jiang, Chengbao ^{[1
]}

Xu, Huibin ^{[1
]}

机构：

[1] Beihang Univ, Sch Mat Sci & Engn, Key Lab Aerosp Mat & Performance, Minist Educ, Beijing 100191, Peoples R China

[2] Hebei Univ, Coll Qual & Tech Supervis, Baoding 071002, Peoples R China

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2012年 / 541卷

关键词：

Magnetic shape memory alloys (MSMAs); Directional solidification; Solidified morphology; Martensitic transformation; Premartensitic transformation; FIELD-INDUCED STRAIN; MAGNETIC-FIELD; MARTENSITIC-TRANSFORMATION; CRYSTAL-GROWTH; TEMPERATURE; DEPENDENCE; 1-PERCENT; RECOVERY; STRESS;

D O I：

10.1016/j.jallcom.2012.07.011

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：

The effects of directional solidification rate on the solidified morphologies and phase transformations were studied in polycrystalline Ni50.5Mn25Ga24.5 alloy prepared by induction zone melting method. With the directional solidification rate increasing from 10 mm/h to 800 mm/h, the solidified morphologies of the austenite phase evolved from planar, to cellular, and then to dendritic. The premartensitic transformation was only observed in the planar austenite, and was suppressed in the cellular and dendritic morphologies. The martensitic transformation was observed in all austenitic morphologies. Increasing the directional solidification rate, the martensitic transformation temperatures were slightly decreased, and the transformation hysteresis was expanded. The local energy barrier related to the compositional segregation from the cellular and dendritic austenitic morphologies suppressed the premartensitic transformation and had little influence on martensitic transformation. (C) 2012 Elsevier B. V. All rights reserved.

引用

页码：477 / 482

页数：6

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