Effect of high undercooling on Co-Ni-Ga ferromagnetic shape memory alloys

被引：5

作者：

Li, Junzheng ^{[1
]}

Li, Jianguo ^{[1
]}

机构：

[1] Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Shanghai 200240, Peoples R China

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2011年 / 509卷 / 11期

关键词：

Sub-grain; Undercooling; Co-Ni-Ga; Ferromagnetic shape memory alloy; SINGLE-CRYSTAL SUPERALLOY; GRAIN-REFINEMENT; PHASE; SOLIDIFICATION; DEFORMATION; MECHANISM; MELTS; RECRYSTALLIZATION;

D O I：

10.1016/j.jallcom.2010.12.120

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：

Co45Ni25Ga30 ferromagnetic shape memory alloys were treated by glass fluxing combined with superheating cycling. The effect of high undercooling on solidified microstructure and transformation temperatures was investigated. The martensite lath is obviously refined and a mass of sub-grains are produced with the increase of undercooling. Undercooling rapid solidification introduces a number of dislocations and large internal stress, which give rise to the production of sub-grains in recovery. During the following annealing process, these sub-grains can gradually recrystallize and grow up with an amount of gamma' phase precipitated. Meanwhile, transformation temperatures of undercooled alloys are greatly elevated compared with those of as cast, which results from the large internal stress, and gradually reduce with the heating time. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：4242 / 4246

页数：5

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