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Vol.43, No.5, 337 ~ 344, 2005
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| Title |
| Origin of the Plasticity in Monolithic Amorphous Alloys |
| 이석우 Seok Woo Lee , 이창면 Chang Myun Lee , 채수원 Soo Won Chae , 김유찬 Yu Chan Kim , 이재철 Jae Chul Lee |
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| Abstract |
| Various Cu-Zr bearing monolithic amorphous alloys, exhibiting different stress-strain behaviors, were prepared to investigate the nature of the plasticity shown by theses alloys. Microscopic observation of the quasi-statically compressed Cu_(50)Zr_(43)A1_(7) specimen revealed abundant precipitation of nanocrystallites, while insignificant changes in the microstructure were observed from the Cu_(64)Zr_(36) alloy. Finite element analysis was conducted in order to better understand the role of nanocrystallites in an amorphous matrix on the plasticity of the amorphous alloy. The activation energies for crystallization of the amorphous alloys were measured and correlated with the plasticity of the amorphous alloys. Herein, we report for the first time that the origin of the plasticity of monolithic amorphous alloys lies in the activation energy for crystallization. (Received February 14, 2005) |
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| Key Words |
| Deformation-induced nanocrystallites, Shear bands, Amorphous alloy |
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