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王忠堂,江吉浩,刘旭南.AZ80镁合金热变形过程中的动态再结晶动力学和运动学模型[J].稀有金属材料与工程(英文),2019,48(7):2062~2067.[Zhongtang WANG,Jihao JIANG and Xunan LIU.Dynamics and kinematics model of dynamic Recrystallization during Thermal Deformation of AZ80 Magnesium alloy[J].Rare Metal Materials and Engineering,2019,48(7):2062~2067.]
Dynamics and kinematics model of dynamic Recrystallization during Thermal Deformation of AZ80 Magnesium alloy
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Received:February 24, 2018  Revised:June 02, 2019
DOI:
Key words: Magnesium alloy  AZ80  dynamic recrystallization  dynamics model  kinematics model
Foundation item:国家自然科学基金项目(面上项目)
Author NameAffiliation
Zhongtang WANG,Jihao JIANG and Xunan LIU  
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Abstract:
      Abstract: The stress-strain curves of AZ80 magnesium alloy are tested by thermal simulation experiment, which the deformation temperature is from 533K to 683K, and strain-rate is from 0.001 to 10 s-1, and deformation degree is 50%. The grain size of dynamic recrystallization (DRX) increases with rising of deformation temperature and reducing of strain-rate. According to the Arrhenius equation and experiment data, the energy of thermal activation of AZ80 magnesium alloy is determined, and a kind of constitutive equation of AZ80 magnesium alloy is established. According to the Sellars equation, the dynamics model of AZ80 magnesium alloy is established, which is defined as the relationship between the volume fraction of DRX and deformation temperature and strain-rate. The kinematics model of AZ80 magnesium alloy is established, which is defined as the relationship between grain size of DRX and deformation temperature and strain-rate. The calculated results of grain size of DRX are in agreement with that of experiment, and relative errors are less than 11.8%. The relationship model between critical strain and steady strain of DRX with deformation temperature and strain-rate are established.