In-Situ Fracture Observation and Fracture Toughness Analysis of Ni-Mn-Ga-Fe Ferromagnetic Shape Memory Alloys
SCIE
SCOPUS
- Title
- In-Situ Fracture Observation and Fracture Toughness Analysis of Ni-Mn-Ga-Fe Ferromagnetic Shape Memory Alloys
- Authors
- Kwangjun Euh; Jung-Moo Lee; Duk-Hyun Nam; Lee, S
- Date Issued
- 2011-12
- Publisher
- SPRINGER
- Abstract
- 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.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/11561
- DOI
- 10.1007/S11661-011-0804-Y
- ISSN
- 1073-5623
- Article Type
- Article
- Citation
- METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, vol. 42A, no. 13, page. 3961 - 3968, 2011-12
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