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.[Hongfei Wu,Jianfeng Fan,Zhaohui Shan,Hua Zhang,Qiang Zhang,Kunkun Deng,Yucheng Wu,Weiguo Li,Hongbiao Dong,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.]
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
投稿时间:2020-02-25  修订日期:2020-03-31
中文关键词:  AZ91镁合金  低温慢速挤压  电脉冲处理  双峰组织  力学性能
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)
中文摘要:
      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约为20-60μm 的未再结晶晶粒和细小的尺寸约为200nm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态再结晶过程相比,EPT过程的再结晶温度显著降低,处理时间明显缩短,有效抑制了再结晶晶粒的生长。同时在EPT过程中析出了大量形状规则的Mg17Al12相,平均尺寸约为200nm。因此,本研究获得了屈服强度为463MPa和极限抗拉强度为527MPa的AZ91双峰合金,这主要归功于双峰组织以及细晶强化、析出强化和加工硬化的共同作用。
Exceptional mechanical properties of a bimodal AZ91 alloy prepared by low-temperature slow rate extrusion and electrical pulse treatment
英文关键词:AZ91 magnesium alloy  Low-temperature slow rate extrusion  Electric pulse treatment  Bimodal microstructure  Mechanical properties.
英文摘要:
      Low-temperature slow rate extrusion (LTSRE) and electrical pulse treatment (EPT) were carried out to obtain a bimodal microstructure in AZ91 Mg alloy, which consisted of coarse un-recrystallized grains of about 20-60μm and fine recrystallized grains of around 200nm. The bimodal grains can be contributed 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 was effectively restrained due to the notably lower recrystallization temperature and shorter processing time compared with the conventional static recrystallization by heat treatment. Meanwhile, abundant Mg17Al12 phase with an average size of 200nm and regular shapes precipitated during EPT. Consequently, the exceptional yield strength of 463MPa and ultimate tensile strength of 527MPa were acquired in 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.
作者单位E-mail
武红飞 新材料界面科学与工程教育部重点实验室 844868310@qq.com 
樊建锋 新材料界面科学与工程教育部重点实验室 fanjianfeng@tyut.edu.cn 
单召辉 新材料界面科学与工程教育部重点实验室  
张华 新材料界面科学与工程教育部重点实验室  
张强 新材料界面科学与工程教育部重点实验室  
邓坤坤 新材料界面科学与工程教育部重点实验室  
吴玉程 新材料界面科学与工程教育部重点实验室  
李卫国 新材料界面科学与工程教育部重点实验室  
董洪标 莱斯特大学工程系  
许并社 新材料界面科学与工程教育部重点实验室  
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