异步轧制AZ31镁合金板材的超塑性工艺及变形机制

经过异步轧制工艺获得AZ31镁合金薄板。在300~450℃范围内,分别通过5×10-3,1×10-3s-1和5×10-4s-1不同应变速率进行高温拉伸实验研究其超塑性变形行为,计算应变速率敏感指数m值、超塑性变形激活能Q及门槛应力σ0值。通过EBSD分析和扫描电镜观察拉伸断裂后的断口形貌,分析AZ31镁合金的超塑性变形机制。结果表明：AZ31镁合金的塑性变形能力随着变形温度的升高及应变速率的降低而增强。当拉伸温度为400℃、m=0.72、应变速率为5×10-4s-1时,AZ31具有良好的超塑性,伸长率最大为206%。温度为400℃时,异步轧制AZ31镁合金的超塑性变形是以晶格扩散控制的晶界滑移...

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Bibliographic Details
Published in材料工程 Vol. 43; no. 8; pp. 7 - 12
Main Author 江海涛 段晓鸽 蔡正旭 王丹
Format Journal Article
LanguageChinese
Published 北京科技大学冶金工程研究院,北京,100083 2015
Subjects
AZ31镁合金
变形机制
晶粒细化
超塑性工艺
AZ31 magnesium alloy
deformation mechanism
变形机制
grain refinement
AZ31镁合金
晶粒细化
超塑性工艺
superplastic process
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ISSN1001-4381
1001-4381
DOI10.11868/j.issn.1001-4381.2015.08.002

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Summary:经过异步轧制工艺获得AZ31镁合金薄板。在300~450℃范围内,分别通过5×10-3,1×10-3s-1和5×10-4s-1不同应变速率进行高温拉伸实验研究其超塑性变形行为,计算应变速率敏感指数m值、超塑性变形激活能Q及门槛应力σ0值。通过EBSD分析和扫描电镜观察拉伸断裂后的断口形貌,分析AZ31镁合金的超塑性变形机制。结果表明：AZ31镁合金的塑性变形能力随着变形温度的升高及应变速率的降低而增强。当拉伸温度为400℃、m=0.72、应变速率为5×10-4s-1时,AZ31具有良好的超塑性,伸长率最大为206%。温度为400℃时,异步轧制AZ31镁合金的超塑性变形是以晶格扩散控制的晶界滑移和基面滑移共同完成的。
Bibliography:11-1800/TB
JIANG Hai-tao, DUAN Xiao-ge, CAI Zheng-xu, WANG Dan （Metallurgical Engineering Research Institute,University of Science and Technology Beijing,Beijing 100083,China）
AZ31magnesium alloy; grain refinement; superplastic process; deformation mechanism
AZ31 magnesium alloy sheet was prepared by asynchronous rolling process.From 300℃ to 450℃,tensile test was conducted with different strain rates of 5×10-3,1×10-3s-1 and 5×10-4s-1respectively to investigate the superplastic deformation behavior of AZ31 magnesium alloy.The value of the strain rate sensitive index m,the superplastic deformation activation energy Qand the threshold stress σ0 were also calculated.The superplastic deformation mechanism of AZ31 was investigated through observation of the fracture morphology of the tensile specimens by EBSD and SEM.The results show that the plastic deformation capacity of AZ31 magnesium alloy enhances with increasing deformation temperature and decreasing strain rate.AZ31 magnesium alloy exhibits good superplasticit
ISSN:1001-4381
1001-4381
DOI:10.11868/j.issn.1001-4381.2015.08.002