| 引用本文: | 何运斌,潘清林,刘晓艳,李文斌.ZK60镁合金加工图的构建及失稳分析[J].材料科学与工艺,2011,19(3):1-7.DOI:10.11951/j.issn.1005-0299.20110301. |
| HE Yun-bin,PAN Qing-lin,LIU Xiao-yan,LI Wen-bin.Processing maps of ZK60 magnesium alloy and flow instability analysis[J].Materials Science and Technology,2011,19(3):1-7.DOI:10.11951/j.issn.1005-0299.20110301. |
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| 摘要: |
| 采用Gleeble-1500热模拟试验机对ZK60镁合金在变形温度为150～400℃,应变速率为0.001～10 s-1条件下的热变形行为进行研究,利用双曲正弦关系式描述了该合金在热变形过程中的稳态流变应力;根据合金动态模型,计算并分析了该合金的加工图.研究表明:利用加工图可确定出该合金热变形的流变失稳区,导致变形失稳的原因主要是孪生和局部流变;试验条件下热变形的最佳工艺参数为变形温度350℃,应变速率0.001 s-1,在该条件下合金发生完全再结晶,具有较好的塑性. |
| 关键词: ZK60合金 流变应力 流变失稳 再结晶 |
| DOI：10.11951/j.issn.1005-0299.20110301 |
| 分类号:TG146.22 |
| 基金项目: |
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| Processing maps of ZK60 magnesium alloy and flow instability analysis |
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HE Yun-bin1,2, PAN Qing-lin1,2, LIU Xiao-yan1,2, LI Wen-bin1,2
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1.Dept.of Materials Science and Engineering,Central South University,Changsha 410083,China;2.Key Laboratory of Nonferrous Metal Materials Science and Engineering,Ministry of Education,Central South University,Changsha 410083,China
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| Abstract: |
| The flow behavior of ZK60 magnesium alloy was investigated by compression tests on a Gleeble-1500 simulator from 150 ℃ to 400 ℃ and from 0.001 s-1to 10 s-1.The steady flow stress during hot compression was modeled by a hyperbolic sine constitutive equation.The processing maps were drawn and analyzed according to the dynamic material model.The results show that the flow instability zones of flow behavior can be recognized by the maps,twining and local flow are the main reasons for the flow instability.According to the maps,the optimal processing temperature and strain rate of hot deformation under the test condition were 300 ℃ and 0.001 s-1,where the alloy was fully recrystallized and exhibited superior ductility. |
| Key words: ZK60 magnesium alloy flow stress flow instability recrystallization |
