Deformation behavior of BMG/crystalline composites supercooled liquid region
- 발행기관 고려대학교
- 발행년도 2008
- 학위수여년월 2008. 2
- 학위명 석사
- 학과 대학원 신소재공학과 신소재공학전공
- 식별자(기타) DL:000018611716
- 서지제어번호 000045437116
초록/요약
The crystalline matrix - bulk metallic glass (BMG) particle composites having two different matrix strengths were manufactured by electroless plating of copper and nickel on BMG powder and subsequent consolidation. The plastic behavior of composites was determined by the uniaxial compression test in the supercooled liquid region of BMG. The localization of the deformation in the soft matrix strongly lowers the flow stress in the composite containing a soft matrix. A homogenous deformation was obtained in the composite having the matrix strength close to the BMG strength. The strain state in the composites was interpreted by the finite element method simulation. The amorphous/crystalline composite comprising amorphous particles embedded in the crystalline nickel matrix was produced and its temperature dependence of the plastic deformation behavior was studied in the supercooled liquid region (SLR) of the amorphous alloy. The flow stress of the amorphous alloy was quite sensitive to the testing temperature in the SLR. The deformation of the composites was dominated by the flow stress of the amorphous alloy. The deformation behavior of the composite was analyzed by finite element method calculations.
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