| Dynamic recrystallization behavior of AZ61 magnesium alloy |
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| 引用本文： | 周海涛 严安庆 刘楚明. Dynamic recrystallization behavior of AZ61 magnesium alloy[J]. 中国有色金属学会会刊, 2005, 15(5): 1055-1061 |
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| 作者姓名： | 周海涛 严安庆 刘楚明 |
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| 作者单位： | [1]School of Materials Science and Engineering, Central South University, Changsha 410083, China [2]Institute of Yichang Measurement Technology, Yichang 443003, China |
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| 摘 要： | An AZ61 alloy was subjected to hot compression at temperatures ranging from 523 K to 673 K, with strain rates of 0. 001 - 1 s^-1. Flow softening occurs at all temperatures and strain rates. There are peak and plateau stresses on flow curves. The initiation and evolution of dynamic recrystallization（DRX） were studied by the flow softening mechanism based on the flow curves and microstructural observations. A linear relationship was established between the logarithmic value of the critical strain for DRX initiation（lnεc） and the logarithmic value of the Zener-Hollomon parameter （lnZ）. The volume fraction of DRX grain （φd） is formulated as a function of the process parameters including strain rate, temperature, and strain. The calculated values of φd agree well with the values extracted from the flow curves. The size of DRX grain（d） was also formulated as a function of the Zener- Hollomon parameter. This study suggests that DRX behavior of AZ61 can be predicated from plastic process parameters.
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| 关 键 词： | 镁合金 动力分析 挤压工艺 流动软化 金属结构 金属压力加工 |
| 文章编号： | 1003-6326（2005）05-1055-07 |
| 收稿时间： | 2004-12-17 |
| 修稿时间： | 2005-05-09 |
Dynamic recrystallization behavior of AZ61 magnesium alloy |
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| ZHOU Hai-tao,YAN An-qing,LIU Chu-ming. Dynamic recrystallization behavior of AZ61 magnesium alloy[J]. Transactions of Nonferrous Metals Society of China, 2005, 15(5): 1055-1061 |
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| Authors: | ZHOU Hai-tao YAN An-qing LIU Chu-ming |
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| Abstract: | An AZ61 alloy was subjected to hot compression at temperatures ranging from 523 K to 673 K,with strain rates of 0. 001 - 1 s-1. Flow softening occurs at all temperatures and strain rates. There are peak and plateau stresses on flow curves. The initiation and evolution of dynamic recrystallization(DRX) were studied by the flow softening mechanism based on the flow curves and microstructural observations. A linear relationship was established between the logarithmic value of the critical strain for DRX initiation(lnεc) and the logarithmic value of the Zener-Hollomon parameter (lnZ). The volume fraction of DRX grain (ψd) is formulated as a function of the process parameters including strain rate, temperature, and strain. The calculated values of ψd agree well with the values extracted from the flow curves. The size of DRX grain(d) was also formulated as a function of the ZenerHollomon parameter. This study suggests that DRX behavior of AZ61 can be predicated from plastic process parameters. |
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| Keywords: | AZ61 magnesium alloy dynamic recrystallization critical strain flow softening |
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