| 低温慢速挤压和电脉冲处理制备具有优异力学性能的AZ91双峰合金 |
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| 引用本文： | 武红飞,樊建锋,单召辉,张华,张强,邓坤坤,吴玉程,李卫国,董洪标,许并社.低温慢速挤压和电脉冲处理制备具有优异力学性能的AZ91双峰合金[J].稀有金属材料与工程,2021,50(3):807-815. |
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| 作者姓名： | 武红飞 樊建锋 单召辉 张华 张强 邓坤坤 吴玉程 李卫国 董洪标 许并社 |
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| 作者单位： | 新材料界面科学与工程教育部重点实验室,新材料界面科学与工程教育部重点实验室,新材料界面科学与工程教育部重点实验室,新材料界面科学与工程教育部重点实验室,新材料界面科学与工程教育部重点实验室,新材料界面科学与工程教育部重点实验室,新材料界面科学与工程教育部重点实验室,新材料界面科学与工程教育部重点实验室,莱斯特大学工程系,新材料界面科学与工程教育部重点实验室 |
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| 基金项目： | 国家自然科学基金项目（U1710118, U1810122, 51504162 and 51601123）；山西省高等学校优秀创新团队（2018）；山西省自然科学基金（201801D221139）；中国山西省留学基金委（2016-029） |
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| 摘 要： | 通过低温慢速挤压(LTSRE)和电脉冲处理(EPT)获得具有双峰结构的AZ91 镁合金,这种结构由粗大的尺寸为20～60 μm 的未再结晶晶粒和细小的尺寸约为200 nm 的再结晶晶粒组成.双峰晶粒结构的形成原因主要是LTSRE过程中的不均匀变形以及EPT对于变形AZ91 镁合金静态再结晶的加速效应.与常规热处理时的静...
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| 关 键 词： | AZ91镁合金 低温慢速挤压 电脉冲处理 双峰组织 力学性能 |
| 收稿时间： | 2020/2/25 0:00:00 |
| 修稿时间： | 2020/3/31 0:00:00 |
Exceptional mechanical properties of a bimodal AZ91 alloy prepared by low-temperature slow rate extrusion and electrical pulse treatment |
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| Hongfei Wu,Jianfeng Fan,Zhaohui Shan,Hua Zhang,Qiang Zhang,Kunkun Deng,Yucheng Wu,Weiguo Li,Hongbiao Dong and Bingshe Xu.Exceptional mechanical properties of a bimodal AZ91 alloy prepared by low-temperature slow rate extrusion and electrical pulse treatment[J].Rare Metal Materials and Engineering,2021,50(3):807-815. |
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| Authors: | Hongfei Wu Jianfeng Fan Zhaohui Shan Hua Zhang Qiang Zhang Kunkun Deng Yucheng Wu Weiguo Li Hongbiao Dong and Bingshe Xu |
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| Affiliation: | Key Laboratory of Interface Science and Engineering in Advanced Materials,Ministry of Education,Taiyuan University of Technology,Key Laboratory of Interface Science and Engineering in Advanced Materials,Ministry of Education,Taiyuan University of Technology,Key Laboratory of Interface Science and Engineering in Advanced Materials,Ministry of Education,Taiyuan University of Technology,Key Laboratory of Interface Science and Engineering in Advanced Materials,Ministry of Education,Taiyuan University of Technology,Key Laboratory of Interface Science and Engineering in Advanced Materials,Ministry of Education,Taiyuan University of Technology,Key Laboratory of Interface Science and Engineering in Advanced Materials,Ministry of Education,Taiyuan University of Technology,Key Laboratory of Interface Science and Engineering in Advanced Materials,Ministry of Education,Taiyuan University of Technology,Key Laboratory of Interface Science and Engineering in Advanced Materials,Ministry of Education,Taiyuan University of Technology,Department of Engineering,University of Leicester,Leicester LE RH,UK,Key Laboratory of Interface Science and Engineering in Advanced Materials,Ministry of Education,Taiyuan University of Technology |
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| Abstract: | Low-temperature slow rate extrusion(LTSRE)and electrical pulse treatment(EPT)were used to obtain the AZ91 Mg alloy with bimodal microstructure.Results show that the alloy consists of coarse unrecrystallized grains of 20~60μm and fine recrystallized grains of~200 nm.The bimodal grains contribute to the inhomogeneous deformation under LTSRE and the acceleration effect of the static recrystallization of the deformed AZ91 magnesium alloy under EPT.In addition,the growth of the recrystallized grains is effectively restrained due to the notably low recrystallization temperature and short processing time,compared with those of the conventional static recrystallization by heat treatment.Meanwhile,abundant Mg17 Al12 phases with an average size of 200 nm and regular shapes are precipitated during EPT.Consequently,the yield strength of 463 MPa and ultimate tensile strength of 527 MPa were acquired for the bimodal AZ91 alloy,which can be primarily attributed to the bimodal microstructure as well as the combined effect of fine grain strengthening,precipitation strengthening and work hardening. |
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| Keywords: | AZ91 magnesium alloy Low-temperature slow rate extrusion Electric pulse treatment Bimodal microstructure Mechanical properties |
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