Superplastic deformation behavior of fine-grained AZ80 magnesium alloy prepared by friction stir processing
Superplastic deformation behavior of fine-grained AZ80 magnesium alloy prepared by friction stir processing
复制标题
搅拌摩擦加工细晶AZ80镁合金的超塑性变形行为
DOI：
10.1016/j.jmrt.2020.03.052
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发表时间：
2020-05
期刊：
影响因子：
--
通讯作者：
Wang LQ
中科院分区：
文献类型：
--
作者：
Wang W;Han P;Peng P;Guo HJ;Huang LY;Qiao K;Hai MN;Yang Q;Wang HD;Wang KS;Wang LQ
搅拌摩擦成形(FSP)是一种同时进行组织细化、均匀化和致密化的大塑性变形新技术。本文研究了FSP法制备的AZ80镁合金的显微组织和超塑性变形行为。FSP显著细化了AZ80镁合金的晶粒，改善了织构。在3×10−、4S−1和350℃时，延伸率达到最大值606%。在3×10-3s−1和300℃或1×10-4s−1和400℃下进行超塑性变形时，超塑性相对较低，表现出较低的应变速率敏感性。β-Mg_(17)Al_(12)析出物和晶粒的粗化均使超塑性伸长率变差。在超塑性变形过程中，外加变形促进了400℃时析出相的过早溶解。此外，超塑性变形削弱和扩展了基面织构。虽然柱状滑移和锥形滑移的激活有利于超塑性变形，但晶界滑移是主要的超塑性变形机制。
Friction stir processing (FSP) is a new severe plastic deformation technique where microstructure refinement, homogenization, and densification occur simultaneously. In this study, the microstructure and superplastic deformation behavior of AZ80 magnesium alloy prepared by FSP were investigated. FSP led to remarkable grain refinement and modification of texture for AZ80 magnesium alloy. A maximum elongation of 606% was obtained at 3 × 10−4s−1and 350 ℃. When superplastic deformation was conducted at 3 × 10-3s−1and 300 ℃, or at 1 × 10-4s−1and 400 ℃, the superplasticity was relatively lower, thus exhibiting a lower strain rate sensitivity. The coarsening of both grains and β-Mg17Al12precipitates deteriorated superplastic elongation. Applied deformation promoted the premature dissolution of β precipitates at 400 ℃ during superplastic deformation. Moreover, superplastic deformation weakened and spread the basal texture. Although the activation of prismatic and pyramidal slips is beneficial for superplastic deformation, grain boundary sliding is the main superplastic deformation mechanism.
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影响因子：
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作者：
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DOI：
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