| 引用本文: | 刘俊生,潘清林,李文斌,何运斌,刘晓艳,梁文杰.含Sc超高强Al-Zn-Cu-Mg-Zr合金的热变形行为和微观组织[J].材料科学与工艺,2010,18(2):289-292.DOI:10.11951/j.issn.1005-0299.20100230. |
| LIU Jun-sheng,PAN Qing-lin,LI Wen-bin,HE Yun-bin,LIU Xiao-yan,LIANG Wen-jie.Studies on deformation behavior and microstructure evolution of super-high strength Al-Zn-Cu-Mg-Zr alloy containing Sc[J].Materials Science and Technology,2010,18(2):289-292.DOI:10.11951/j.issn.1005-0299.20100230. |
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| 摘要: |
| 采用热模拟实验对含Sc超高强Al-Zn-Cu-Mg-Zr合金在应变速率为0.001～10s-1、变形温度为380～470℃的条件下进行了热压缩实验.研究了实验合金的流变应力行为和微观组织演变.结果表明:流变应力随变形温度升高而下降;随应变速率增加峰值应力也相应增加.随变形温度升高和应变速率降低,合金动态再结晶的程度加深,亚晶尺寸变大.含Sc超高强Al-Zn-Cu-Mg-Zr合金,形成了Al3Sc弥散相,该相可强烈抑制再结晶.合金主要软化机制为动态回复伴随动态再结晶. |
| 关键词: 含Sc超高强Al-Zn-Cu-Mg-Zr合金 热变形 应变速率 变形温度 流变应力 |
| DOI：10.11951/j.issn.1005-0299.20100230 |
| 分类号:TG146.21 |
| 基金项目:国家高技术发展计划资助项目(2006AA03Z523) |
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| Studies on deformation behavior and microstructure evolution of super-high strength Al-Zn-Cu-Mg-Zr alloy containing Sc |
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LIU Jun-sheng, PAN Qing-lin, LI Wen-bin, HE Yun-bin, LIU Xiao-yan, LIANG Wen-jie
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School of Materials Science and Engineering,Central South University,Changsha 410083,China
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| Abstract: |
| Hot deformation of Al-Zn-Cu-Mg-Zr alloy containing Sc over the strain rate range of 0. 00110s-1and the temperature range of 380-470 ℃ has been studied by thermal simulation test. The flow stress behavior and microstructure evolution were investigated. The experimental results show that the flow stress behavior decreases with the increase of with the increase of deformation temperature,and the peak stress increases with the increase of deformation strain rate with the increase of deformation temperature and the decrease of strain rate,dynamic recrystallizatiou increases and sub grain size increases. Super-high strength Al-Zn-Mg-Zr alloy containing Sc can obviously restrain recrystallization because of the formation of A13Sc particles. The main softening mechanism of the alloy is dynamic recovery and recrystallization. |
| Key words: Al-Zn-Cu-Mg-Zr alloy containing Sc hot compression strain rate deformation temperature flow stress |
