首页|变形温度对塑性变形新方法加工的AZ31镁合金显微组织和织构的影响

变形温度对塑性变形新方法加工的AZ31镁合金显微组织和织构的影响

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提出一种新的反复镦挤变形(RUE)方法.采用光学显微镜(OM)、X射线衍射(XRD)、电子背散射衍射(EBSD)和维氏硬度计分析不同变形温度对RUE变形AZ31镁合金显微组织和织构的影响.结果表明:经RUE变形后,AZ31镁合金组织局部细化至0.8 μm,细化机制主要为连续动态再结晶(CDRX);随着温度的升高,首先形成平行于剪切面的基面织构,随后形成强度减弱的{11(2)0}<10(1)0>织构,最后形成{0001}<10(1)0>和{0001}<11(2)0)织构.基面和锥面<a>位错滑移导致织构分裂.经RUE变形后AZ31镁合金的最大硬度较初始状态提高42.4％,主要原因是细晶强化和位错强化.
Effect of deformation temperature on microstructure and texture of AZ31 magnesium alloy processed by new plastic deformation method
A new method of repeated upsetting-extrusion(RUE)deformation was presented.The effects of different deformation temperatures on the microstructure and texture of RUE deformed AZ31 magnesium(Mg)alloy were studied using optical microscopy(OM),X-ray diffraction(XRD),electron backscatter diffraction(EBSD),and Vickers hardness tester.The results show that the microstructure of the AZ31 Mg alloy is locally refined to 0.8 μm after RUE deformation,and the main refinement mechanism is the continuous dynamic recrystallization(CDRX).As the temperature increases,the texture of basal plane parallel to shearing plane is formed firstly,followed by {1120}<10(1)0>texture with weaker intensity,and finally {0001}<10(1)0>and {0001}<11(2)0>textures.The texture split is caused by the dislocation slip of basal<a>and pyramidal<a>.The maximum hardness of the AZ31 Mg alloy after RUE deformation is increased by 42.4％compared with that at the initial state,which is mainly due to the fine-grained strengthening and the dislocation strengthening.

AZ31 Mg alloyrepeated upsetting-extrusiondynamic recrystallizationtexturehardness

范宇田、卢立伟、刘剑波、马旻、黄伟颖、巫瑞智

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湖南科技大学材料科学与工程学院,湘潭 411201

湖南金峰机械科技有限公司,娄底 417700

长沙理工大学能源与动力工程学院,高效清洁能源利用重点实验室,长沙 410114

哈尔滨工程大学材料科学与化学工程学院,超轻材料与表面技术教育部重点实验室,哈尔滨 150001

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AZ31镁合金 反复镦挤变形 动态再结晶 织构 硬度

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNatural Science Foundation of Hunan Province,ChinaXiangtan Special Project for Building a National Innovative City,ChinaYancheng"Talent Plan of Yellow Sea Pearl"for Leading Talent Project,China

52174362519752072023JJ10020CG-YB20221043

2024

10.1016/S1003-6326(24)66530-1

中国有色金属学报(英文版)
中国有色金属学会

中国有色金属学报(英文版)

CSTPCD
影响因子：1.183
ISSN：1003-6326
年,卷(期)：2024.34(7)