대한금속재료학회지 (Korean Journal of Metals and Materials)

  • 제47권12호
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  • Pages.787-796
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  • 2009
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  • 1738-8228(pISSN)
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  • 2288-8241(eISSN)
대한금속재료학회 (The Korean Institute of Metals and Materials)
권호 표지

Ni-Mn-Ga-Fe 강자성 형상기억합금의 미세파괴기구 및 파괴성질

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

  • 어광준 (재료연구소 구조재료연구본부) ;
  • 이정무 (재료연구소 구조재료연구본부) ;
  • 남덕현 (포항공과대학교 항공재료연구센터) ;
  • 이성학 (포항공과대학교 항공재료연구센터)
  • Euh, Kwangjun (Structural Materials Division, Korea Institute of Materials Science) ;
  • Lee, Jung-Moo (Structural Materials Division, Korea Institute of Materials Science) ;
  • Nam, Duk-Hyun (Center for Advanced Aerospace Materials, Pohang University of Science and Technology) ;
  • Lee, Sunghak (Center for Advanced Aerospace Materials, Pohang University of Science and Technology)
  • 투고 : 2009.07.22
  • 발행 : 2009.12.20
⟨ 이전 논문 다음 논문 ⟩

초록

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 (SEM) chamber. The Ni-Mn-Ga-Fe alloys contained a considerable amount of ductile particles in the grains after the homogenization treatment at $800{\sim}1100^{\circ}C$. ${\gamma}$ particles were coarsened and distributed homogeneously along {$\beta}$ 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.

키워드

과제정보

연구 과제 주관 기관 : 재료연구소

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