Microstructure and martensitic transformation behavior of a constant-strain aged Ni-Mn-Ga-Ti magnetic shape memory alloy

被引：5
作者：
Dong, G. F. [1 ]
Gao, Z. Y. [2 ]
Tan, C. L. [3 ]
Cai, W. [2 ]
Sui, J. H. [2 ]
机构：
[1] Dalian Univ Technol, Coll Phys Sci & Technol, Dalian 116622, Peoples R China
[2] Harbin Inst Technol, Sch Mat Sci & Engn, Natl Key Lab Precis Hot Proc Met, Harbin 150001, Peoples R China
[3] Harbin Univ Sci & Technol, Coll Appl Sci, Harbin 150080, Peoples R China
来源：
JOURNAL OF MATERIALS SCIENCE | 2010年 / 45卷 / 20期
基金：
中国国家自然科学基金;
关键词：
MECHANICAL-PROPERTIES; PHASE-TRANSFORMATION; TEMPERATURES;
D O I：
10.1007/s10853-010-4606-1
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The Ni(53)Mn(23.5)Ga(18.5)Ti(5) ferromagnetic shape memory alloy has been aged under 2% constant-strain at various temperatures for 3 h, and the microstructure and martensitic transformation behaviors have been investigated by scanning electron microscopy (SEM), transmission electron microscopy (TEM), and differential scanning calorimetry (DSC). It was found that after constant-strain aging, the amount of the Ni-rich precipitates with lenticular morphology is higher and the size of the second-phase particle is smaller when compared to that of the conventional aged samples. The martensitic transformation temperatures first decrease remarkably with the increase of aging temperature, and then increase when the aging temperature exceeds 973 K, which can be attributed to the change of the Ni-content in the matrix as well as the strengthening effect by fine Ni(3)Ti precipitates.
引用
收藏
页码：5490 / 5494
页数：5
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