• Title/Summary/Keyword: 비결정질 합금

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High Temperature Deformation Behavior of Fe-base High Strength Alloys (고강도 Fe계 합금의 고온 변형 특성)

  • Kwon, Woon-Hyun;Choi, Il-Dong
    • Journal of Advanced Marine Engineering and Technology
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    • v.32 no.6
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    • pp.938-946
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    • 2008
  • Fe-base amorphous alloy and two crystalline phases composite were fabricated. The effect of temperature and strain rate on mechanical properties was evaluated utilizing compression test. Mixture of non-crystalline and crystalline phases were found using X-ray diffraction (XRD) and differential thermal analysis (DTA) tests. Based on glass transition temperature and crystallization temperature. compression tests were performed in the temperature ranging from $560^{\circ}C$ to $700^{\circ}C$ with $20^{\circ}C$ interval. Relationship between microstructure, including fracture surface morphology, and mechanical behavior was studied. The peak stress of Fe-base amorphous alloy was over 2GPa and expected to have a good wear resistance, but it is expected hard to deform because of low ductility. The peak stress and elongation of two crystalline phases composite was over 1GPa and about 20%, therefore it is possible to deform high strength wear resistant materials such as engine valve.