热处理对超细晶稀土镁合金组织和性能的影响  被引量:1

Effect of Heat Treatments on Microstructures and Properties of Ultra-fine Grain Rare Earth-Magnesium Alloy

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作  者:樊昀 周玲烨 陈彬[1] 曾小勤[1] FAN Yun;ZHOU Lingye;CHEN Bin;ZENG Xiaoqin(School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区:[1]上海交通大学材料科学与工程学院,上海200240

出  处:《上海航天》2019年第2期66-73,共8页Aerospace Shanghai

基  金:国家重点研发计划(2016YFB0701201)

摘  要:镁合金作为目前工业应用中最轻的结构材料之一,在航空航天领域具有良好的应用前景。细晶镁合金因其优越的力学性能受到人们关注,但其热稳定性在一定程度上限制了其应用。为此,使用等通道角挤压(ECAP)对Mg-Y-Zn-Zr合金进行强烈塑性变形,得到超细晶镁合金,对其进行不同温度、不同时间条件下的退火处理,以进一步提高该合金的塑性,研究该合金在高温下的稳定性。对处理后的样品进行力学性能测试,显微结构观察,背散射电子衍射(EBSD)分析。结果显示:在200~300℃下保温0.5 h,可以在保持变形合金强度的情况下提高合金塑性,且低温处理的合金内部基本没有出现再结晶现象。该合金热稳定性好,可作为轻量化材料应用到多种航空航天部件中。As one of the most efficient light-mass materials in industrial applications,magnesium alloys have promising application potential in the field of aerospace.Fine grain magnesium alloys have good mechanical properties,but their applications are limited by their poor stability at high temperatures.In order to enlarge their influence,the equal channel angular pressing (ECAP) method is used to treat the Mg-Y-Zn-Zr alloy for obtaining the ultra-fine grain magnesium alloy through strong plastic deformation.Then the alloy is differently heat treated for improving its plasticity and examining its stability at high temperatures.Mechanical tests,microstructure observations and the electron back-scattered diffraction (EBSD) analysis are performed.The sample treated under 200-300 ℃ for 0.5 h is found to have higher plasticity while maintaining the strength.Moreover,basically no recrystallization is found,showing good stability under these temperatures.This alloy with good thermostability can be used as the light-mass material for many parts in the field of aerospace.

关 键 词:超细晶 Mg-Y-Zn-Zr镁合金 等通道角挤压(ECAP) 显微结构 力学性能 

分 类 号:TG156.21[金属学及工艺—热处理]

 

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