Optimum parameters and kinetic analysis for hot working of a homogenized Mg–8Sn–1Al–1Zn alloy
Optimum parameters and kinetic analysis for hot working of a homogenized Mg–8Sn–1Al–1Zn alloy
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DOI：
10.1016/j.matdes.2015.07.047
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发表时间：
2015-11
影响因子：
8.4
通讯作者：
W. Cheng;Q. Tian;Hui Yu;B. You;Hongxia Wang
中科院分区：
文献类型：
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作者：
W. Cheng;Q. Tian;Hui Yu;B. You;Hongxia Wang
Mg-8 Sn-1Al-1 Zn（wt.%）合金的热变形行为在523-673 K的温度范围和0.33-10 s-1的应变速率下研究了TAZ 811合金，以探索其作为锻造合金的潜力。动力学分析表明，位错攀移机制可能是TAZ 811合金有效的变形机制。为了获得该合金的最佳热加工参数，构建了由功率耗散图和不稳定性图组成的加工图。实际的加工窗口可以确定为T= 623-673 K和ε stec = 0.33-3.3 s-1，在673 K和0.33 s-1处出现约20%的峰值效率。流动不稳定区域出现在523-598 K的温度和0.33-0.66 s-1的应变速率附近。此外，动态再结晶（DRX）机制进行了分析，就其微观结构，这是一致的预测结果，从加工图。
Hot deformation behavior of a homogenized Mg–8Sn–1Al–1Zn (wt.%)(TAZ811) alloy was investigated at the temperature range of 523–673 K and the strain rate of 0.33–10 s− 1 to explore its potential as a wrought alloy. The kinetic analysis indicated that dislocation climb mechanism was likely to be an operative deformation mechanism for TAZ811 alloy. To obtain the optimum hot working parameters of the alloy, processing map consisting of a power dissipation map and an instability map was constructed. The practical processing window could be determined as T= 623–673 K and ε˙= 0.33–3.3 s− 1 with a peak efficiency of approximately 20% occurring at 673 K and 0.33 s− 1. The flow instability region occurs at around the temperature of 523–598 K and stain rate of 0.33–0.66 s− 1. In addition, dynamic recrystallization (DRX) mechanisms were analyzed with respect to its microstructure, which was consistent with the predicted results from the processing map.