In-Situ Fracture Observation and Fracture Toughness Analysis of Ni-Mn-Ga-Fe Ferromagnetic Shape Memory Alloys

被引:4
作者
Euh, Kwangjun [3 ]
Lee, Jung-Moo [3 ]
Nam, Duk-Hyun [1 ]
Lee, Sunghak [1 ,2 ]
机构
[1] Pohang Univ Sci & Technol, Ctr Adv Aerosp Mat, Pohang 790784, South Korea
[2] Pohang Univ Sci & Technol, Dept Mat Sci & Engn, Pohang 790784, South Korea
[3] Korea Inst Mat Sci, Struct Mat Div, Chang Won 641010, South Korea
来源
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 2011年 / 42A卷 / 13期
关键词
FIELD-INDUCED STRAIN; MARTENSITIC-TRANSFORMATION; MICROSTRUCTURE; CONSOLIDATION; TRANSITION; MECHANISM; DUCTILITY; DAMAGE; TI;
D O I
10.1007/s11661-011-0804-y
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The fracture property improvement of Ni-Mn-Ga-Fe ferromagnetic shape memory alloys containing ductile gamma particles was explained by direct observation of microfracture processes using an in-situ loading stage installed inside a scanning electron microscope (SEM) chamber. The Ni-Mn-Ga-Fe alloys contained a considerable amount of gamma particles in beta grains after the homogenization treatment at 1073 K to 1373 K (800 A degrees C to 1100 A degrees C). With increasing homogenization temperature, gamma particles were coarsened and distributed homogeneously along beta grain boundaries as well as inside beta grains. According to the in-situ microfracture observation, gamma particles effectively acted as blocking sites of crack propagation and provided the stable crack growth, which could be confirmed by the R-curve analysis. The increase in fracture resistance with increasing crack length improved overall fracture properties of the Ni-Mn-Ga-Fe alloys. This improvement could be explained by mechanisms of blocking of crack propagation and crack blunting and bridging.
引用
收藏
页码:3961 / 3968
页数:8
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