付学丹,王忠军,贾维平.铸态ZK60-1.0Er镁合金热压缩变形行为的研究[J].稀有金属材料与工程,2017,46(10):2936~2942.[fuxuedan,wangzhongjun,jiaweiping.Research on Hot Compression Deformation Behavior of as-cast ZK60-1.0 Er magnesium alloy[J].Rare Metal Materials and Engineering,2017,46(10):2936~2942.]
铸态ZK60-1.0Er镁合金热压缩变形行为的研究
投稿时间:2015-07-15  修订日期:2015-08-27
中文关键词:  ZK60-1.0Er,镁合金,本构方程,热加工图,变形机制
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
中文摘要:
      采用Gleeble 1500D热模拟实验机对ZK60-1.0Er镁合金的高温热压缩变形行为进行了研究。热压缩参数应变速率?为0.0001s-1,0.001s-1,0.01s-1和1.0 s-1;变形温度T为160℃,260℃,320℃和420℃。试验结果表明:ZK60-1.0Er镁合金的热压缩变形过程为加工硬化,动态回复DR和动态再结晶DRX的竞争机制。通过Zener-Hollomon参数建立了ZK60-1.0Er镁合金热压缩本构方程, 根据本构方程计算的理论应力值与实际应力值吻合;同时还根据材料动态模型建立了该种合金的热加工图,并且通过对微观组织的观察和分析可知:该种镁合金的热加工图包含低温高应变速率和高温低应变速率2个失稳区域。该种镁合金适宜的热加工区间为:225~420℃,0.01~1.0 s-1,在该区域内存在1个功率耗散效率的峰值,η max = 45%。稀土相的存在促进了ZK60-1.0Er镁合金的动态再结晶形核,平均变形激活能 =152.5KJ/mol, 该合金的微观变形主要机制为晶界滑移和晶格自扩散导致的动态回复和动态再结晶。
Research on Hot Compression Deformation Behavior of as-cast ZK60-1.0 Er magnesium alloy
英文关键词:ZK60-1.0Er, magnesium alloy, constitutive equation, processing map, deformation mechanism
英文摘要:
      The high temperature hot compressive deformation behavior of as-cast ZK60-1.0Er magnesium alloy occurring homogenization have been studied by Gleeble-1500D thermal simulator at the strain rate 0.0001s-1,0.001s-1,0.01s-1 and 1.0s-1,the temperature 160℃, 260℃, 320℃ and 420℃. The experimental results show that the competition between work hardening, dynamic recovery and dynamic recrystallization of hot compression deformation of as-cast ZK60-1.0Er magnesium alloy. Constitutive equation of thermocompression of ZK60-1.0Er magnesium alloy was developed by the Zener-Hollomon parameter, theorial stress value which was calculated according to the constitutive equation is in accordance with the actual stress value; Meanwhile according to the material dynamic model, the processing map of this magnesium alloy was obtained, in addition, observing and analyzing metallographic microstructure shows that the processing map contains two instability areas: low temperature high strain rate and high temperature low strain rate. The most optimal hot working range for this kind of alloy: 225~420℃, 0.01~1.0s-1, having one peak efficiency η max = 45%. The existence of rare earth promote dynamic recrystallization nucleation of ZK60-1.0Er magnesium alloy, the average deformation activation energy was 152.5KJ/mol, main mechanisms were dynamic recovery and dynamic recrystallization caused by the grain boundary sliding and lattice self-diffusion.
作者单位E-mail
付学丹 辽宁科技大学 材料与冶金学院 2223007063@qq.com 
王忠军 辽宁科技大学 材料与冶金学院 zhongjunwang@126.com 
贾维平 辽宁科技大学 材料与冶金学院  
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