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ECAP으로 제조된 초미세립 Al-Mg 합금의 동적 변형거동
김양곤(Y.G. Kim),고영건(Y.G. Ko),신동혁(D.H. Shin),이성학(S. Lee) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.5
The influence of equal-channel angular pressing(ECAP) route on dynamic deformation behavior of ultra-fine grained Al-4.4% MG alloys was investigated in this study. The 8-pass ECAPed specimens consisted of ultra-fine grains of 0.5 μm in size, and contained the considerable amount of second phase particles, which were fragmented and distributed homogeneously in the matrix. The result of dynamic torsional tests indicated that the maximum shear stress and fracture shear strain were lowest in the specimen deformed by ECAP via route A among the 8-pass ECAPed specimens. The formation of adiabatic shear bands was addressed by concepts of crifical shear strain, deformation energy required for void initiation, and microstructural homogeneity related to ECAP routes.