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李春,崔乐,范新会.Mg-9Zn-xAl合金半固态成形的热力学分析及试验研究[J].稀有金属材料与工程(英文),2019,48(6):1769~1776.[Li Chun,Cui Le and Fan Xinhui.Thermodynamic analysis and experimental investigation of Mg-9Zn-xAl alloy for semi-solid processing[J].Rare Metal Materials and Engineering,2019,48(6):1769~1776.]
Thermodynamic analysis and experimental investigation of Mg-9Zn-xAl alloy for semi-solid processing
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Received:January 13, 2018  Revised:April 21, 2018
DOI:
Key words: Thermodynamic calculation  Mg-9Zn-xAl  semi-solid forming  phase transformation
Foundation item:国家自然科学基金项目(面上项目,重点项目,重大项目)
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Li Chun,Cui Le and Fan Xinhui  
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Abstract:
      Solidification temperature range, temperature sensitivity of solid fraction, temperature process window and phase composition and transformation path of Mg-9Zn-xAl(x=2,4,6) were calculated by Pandat calculation, and studied by experiment. The results indicate that the bigger temperature window is conducive to the control and operation of semi-solid forming for Mg-9Zn-xAl alloy, and the temperature sensitivity of solid fraction is all smaller than 0.015. Mg-9Zn-xAl alloy has the different transformation temperature and path of the phase at the different Al addition. α-Mg, MgZn, Mg32(Al,Zn)49 and Al5Mg11Zn4 were formed in all samples, when Al addition is increased to 6%, Mg17Al12 phase was formed. The grain size and roundness of Mg-9Zn-xAl alloys which prepared by self-inoculation rheo-diecasting method are 65.3μm, 56.5μm, 52.2μm and 1.3, 1.19, 1.23 respectively. When the operating temperature is 150℃, the comprehensive strength and deformation are 278MPa, 283MPa, 295MPa and 36.22%, 33.02%, 31.21% respectively.