Transactions of Materials Processing (소성∙가공)

The Korean Society for Technology of Plasticity and materials processing (한국소성∙가공학회)
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Tensile Deformation Behavior of Zr-based Bulk Metallic Glass Composite with Different Strain Rate

Zr계 벌크 비정질 복합재의 변형률 속도에 따른 인장 변형 거동 연구

  • 김규식 (안동대학교 신소재공학부 청정소재연구센터) ;
  • 김지식 (경북대학교 상주캠퍼스 신소재공학과) ;
  • 허훈 (한국과학기술원 기계공학) ;
  • 이기안 (안동대학교 신소재공학부)
  • Published : 2009.10.01
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Abstract

Tensile deformation behavior with different strain rate was investigated. $Zr_{56.2}Ti_{13.8}Nb_{5.0}Cu_{6.9}Ni_{5.6}Be_{12.5}$(bulk metallic glass alloy possessed crystal phase which was called $\beta$-phase of dendrite shape, mean size of $20{\sim}30{\mu}m$ and occupied 25% of the total volume) was used in this study. Maximum tensile strength was obtained as 1.74GPa at strain rate $10^2s^{-1}$ and minimum strength was found to be 1.6GPa at $10^{-1}s^{-1}$. And then, maximum plastic deformation occurred at the strain rate of $5{\times}10^{-2}s^{-1}$ and represented 1.75%, though minimum plastic deformation showed 0%. In the specific range of strain rate, relatively higher plastic deformation and lower ultimate tensile strength were found with lots of shear bands. The fractographical observation after tensile test indicated that vein like pattern on the fracture surface was well developed especially in the above range of strain rate.

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References

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