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Crystallization Process of Zr55Al10Ni5Cu30 Bulk Metallic Glasses with Different Microstructure |
Honghong YAN,Yong HU( ),Yongtang LI,Zhijie YAN,Dawen ZHAO,Yina GUO |
Shanxi Key Laboratory of Metallic Materials Forming Theory and Technology, School of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan 030024 |
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Cite this article:
Honghong YAN,Yong HU,Yongtang LI,Zhijie YAN,Dawen ZHAO,Yina GUO. Crystallization Process of Zr55Al10Ni5Cu30 Bulk Metallic Glasses with Different Microstructure. Chinese Journal of Materials Research, 2014, 28(6): 427-432.
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Abstract The crystallization process of the as-cast and as-rolled Zr55Al10Ni5Cu30 bulk metallic glasses, which have similar crystallization fraction and crystallization activation energy but different microstructure, was inverstigated by means of differential scanning calorimeter (DSC) with isothermal and continuous heating. The results show that the two metallic glasses exhibit similar crystallization rate in the initial stage of crystallization (until 30 min), while the crystallization rate of the as-rolled one is faster than that of the as-cast one in the later stage of crystallization (after 30 min); however, according to JMA equation, the crystallization activation energy deduced from crystallization onset temperature Tx and crystallization peak temperature Tp can not give a comprehensive explanation on the thermal stability of metallic glasses. In addition, the weakening of atomic binding forces and strengthening of short range order in the shear bands may decrease the thermal stability and therewith enhance the crystallization rate of the as-rolled Zr55Al10Ni5Cu30 metallic glass.
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Received: 11 February 2014
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Fund: *Supported by National Natural Science Foundation of China No. 51204118, Program for the Top Young Academic Leaders of Higher Learning Institutions of Shanxi (2013), Research Project Supported by Shanxi Scholarship Council of China No. 2013-094, Natural Science Foundation of Shanxi Province Nos. 2011021020-1 and 2012021018-3. |
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