Microfracture Mechanism and Fracture Properties of Ni-Mn-Ga-Fe Ferromagnetic Shape Memory Alloys

被引：0
|
作者：
Euh, Kwangjun [1 ]
Lee, Jung-Moo [1 ]
Nam, Duk-Hyun [2 ]
Lee, Sunghak [2 ]
机构：
[1] Korea Inst Mat Sci, Struct Mat Div, Chang Won 641010, South Korea
[2] Pohang Univ Sci & Technol, Ctr Adv Aerosp Mat, Pohang 790784, South Korea
来源：
JOURNAL OF THE KOREAN INSTITUTE OF METALS AND MATERIALS | 2009年 / 47卷 / 12期
关键词：
Ni-Mn-Ga-Fe; Magnetic shape memory alloy; Fracture toughness; Homogenization treatment; R-curve; FIELD-INDUCED STRAIN; MARTENSITIC-TRANSFORMATION; SINGLE-CRYSTALS; MAGNETOSTRICTION; PHASE;
D O I：
暂无
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The fracture toughness improvement of Ni-Mn-Ga-Fe ferromagnetic shape memory alloys containing ductile particles was explained by direct observation of microfracture processes using an in situ loading stage installed inside a scanning electron microscope (SEW chamber. The Ni-Mn-Ga-Fe alloys contained a considerable amount of ductile particles in the grains after the homogenization treatment at 800 similar to 1100 degrees C. gamma particles were coarsened and distributed homogeneously along P grain boundaries as well as inside beta grains as the homogenization temperature increased. The in situ microfracture observation results indicated that gamma particles effectively acted as blocking sites of crack propagation, and provided stable crack growth that could be confirmed by the R-curve analysis. This increase in fracture resistance with increasing crack length improved overall fracture properties of the alloys containing gamma particles.
引用
收藏
页码：787 / 796
页数：10
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