Increasing magnetoplasticity in polycrystalline Ni-Mn-Ga by reducing internal constraints through porosity

被引：80
作者：
Boonyongmaneerat, Yuttanant [1 ]
Chmielus, Markus [2 ]
Dunand, David C. [1 ]
Mullner, Peter [2 ]
机构：
[1] Northwestern Univ, Dept Mat Sci & Engn, Evanston, IL 60208 USA
[2] Boise State Univ, Dept Mat Sci & Engn, Boise, ID 83725 USA
来源：
PHYSICAL REVIEW LETTERS | 2007年 / 99卷 / 24期
关键词：
D O I：
10.1103/PhysRevLett.99.247201
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Foams with 55% and 76% open porosity were produced from a Ni-Mn-Ga magnetic shape-memory alloy by replication casting. These polycrystalline martensitic foams display a fully reversible magnetic-field-induced strain of up to 0.115% without bias stress, which is about 50 times larger than nonporous, fine-grained Ni-Mn-Ga. This very large improvement is attributed to the bamboolike structure of grains in the foam struts which, due to reduced internal constraints, deform by magnetic-field-induced twinning more easily than equiaxed grains in nonporous Ni-Mn-Ga.
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页数：4
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