李勇,刘俊伟,戴木海,张昱,姚敬

• 1:南昌航空大学材料科学与工程学院
• 2:江西洪都航空工业集团有限责任公司

摘要(Abstract)：

为了研究轧制态LZ91镁锂合金的超塑性变形特征,对其在不同温度(513、553、593和633 K)、不同应变速率(9.06×10~(-4)、4.53×10~(-3)和2.26×10~(-2) s~(-1))下进行了单轴热拉伸试验。结果表明:LZ91合金流变应力曲线呈现典型的动态再结晶特征,峰值应力随变形温度升高(应变速率降低)而降低;在试验温度范围内合金的平均热变形激活能Q=89.74 kJ/mol,在633 K时的应变速率敏感指数m为0.422,说明合金具备超塑性特征,且超塑性变形机制为晶界扩散控制的晶界滑移。轧制态LZ91合金的组织为α-Mg相和β-Li相,且α-Mg相随机分布在β-Li相中,热变形过程中合金产生明显的动态再结晶。

关键词(KeyWords)： LZ91镁锂合金;本构模型;微观组织

Abstract:

Keywords:

基金项目(Foundation): 江西省教育厅科技项目(DA202101175)

作者(Author): 李勇,刘俊伟,戴木海,张昱,姚敬

DOI: 10.13289/j.issn.1009-6264.2021-0174

参考文献(References)：

• [1] Uematsu Y,Tokaji K,Matsumoto M.Effect of aging treatment on fatigue behaviour in extruded AZ61 and AZ80 magnesium alloys[J].Materials Science and Engineering A,2009,517(1/2):138-145.
• [2] 王智祥，金熌，陈文江，等.AZ91镁合金的热变形特征及组织演变[J].材料热处理学报，2014,35(10):17-22.WANG Zhi-xiang,JIN Shan,CHEN Wen-jiang,et al.Flow stress and microstructure of AZ91 magnesium alloy in hot compression deformation[J].Transactions of Materials and Heat Treatment,2014,35(10):17-22.
• [3] 刘俊伟，戴木海，鲁世强，等.LZ61镁锂合金热变形行为及微观组织研究[J].特种铸造及有色合金，2019,39(1):1-5.LIU Jiu-wei,DAI Mu-hai,LU Shi-qiang,et al.Hot deformation behavior and microstructure of LZ61 alloy[J].Special Casting and Nonferrous Alloy,2019,39(1):1-5.
• [4] 詹美燕，李春明，尚俊玲.镁合金的塑性变形机制和孪生变形研究[J].材料导报，2011,25(3):1-7.ZHAN Mei-yan,LI Chun-ming,SHANG Jun-ling.Investigation of the plastic deformation mechanism and twinning of magnesium alloy[J].Materials Reports,2011,25(2):1-7.
• [5] 刘庆.镁合金塑性变形机理研究进展[J].金属学报，2010,46(11):1458-1472.LIU Qing.Research progress on plastic deformation mechanism of Mg alloys[J].Acta Metallurgica Sinica,2010,46(11):1458-1472.
• [6] 赵鸿金，李涛涛，杨正斌，等.AZ31镁合金板材轧制过程中边部物理场分布[J].稀有金属，2016,40(10):990-995.ZHAO Hong-jin,LI Tao-tao,YANG Zheng-bin,et al.Physical field distribution of AZ31 magnesium alloys plate edge in rolling process[J].Chinese Journal of Rare Metals,2016,40(10):990-995.
• [7] Liu J W,Zhao Z G,Lu S Q.Microstructure evolution and constitutive equation for the hot deformation of LZ91 Mg alloy[J].Catalysis Today,2018,318:119-125.
• [8] 曹富荣.Mg-Li系合金超塑性研究进展[J].精密成形工程，2017,9(3):8-12.CAO Fu-rong.Superplasticity of Mg-Li system alloys[J].Journal of Netshape Forming Engineering,2017,9(3):8-12.
• [9] Rahulan N,Gopalan S,Kumaran S.Mechanical behavior of Mg-Li-Al alloys[J].Materials Today:Proceedings,2018,5(9):17935-17943.
• [10] Karewar S,Gupta N,Groh S,et al.Effect of Li on the deformation mechanisms of nanocrystalline hexagonal close packed magnesium[J].Computational Materials Science,2017,126:252-264.
• [11] 刘文辉，姚玮，刘旭贺，等.冷轧变形对LZ91镁锂合金显微组织及力学性能的影响[J].有色金属工程，2016,6(6):24-28.LIU Wen-hui,YAO Wei,LIU Xu-he,et al.Effect of cold rolling on the microstructure and mechanical properties of LZ91 Mg-Li Alloy[J].Nonferrous Metals Engineering,2016,6(6):24-28.
• [12] 李瑞红，蒋斌，陈志军，等.超轻Mg-Li-Al系变形镁合金挤压板材的组织及性能[J].中国有色金属学报，2016,26(1):31-36.LI Rui-hong,JIANG Bin,CHEN Zhi-jun,et al.Microstructure and mechanical properties of as-extruded ultra-light Mg-Li-Al sheet[J].The Chinese Journal of Nonferrous Metals,2016,26(1):31-36.
• [13] Chiu C H,Wu H Y,Wang J Y,et al.Microstructure and mechanical behavior of LZ91 Mg alloy processed by rolling and heat treatments[J].Journal of Alloys and Compounds,2008,460(1/2):246-252.
• [14] Ma L N,Yang Y,Zhou G,et al.Effect of rolling reduction and annealing process on microstructure and corrosion behavior of LZ91 alloy sheet[J].Transactions of Nonferrous Metals Society of China,2020,30(7):1816-1825.
• [15] 万贻敏，刘俊伟，袁荣火，等.LZ91铸态合金生物腐蚀机理研究[J].矿冶工程，2016,36(1):117-120.WAN Yi-min LIU Jun-wei,YUAN Rong-huo,et al.Research of bio-corrosion behavior on as-cast LZ91 alloy[J].Mining and Metallurgical Engineering,2016,36(1):117-120.
• [16] 姜炳春，卢立伟，文泽军，等.LZ92镁锂合金流变应力预测模型[J].材料热处理学报，2020,41(9):147-154.JIANG Bing-chun,LU Li-wei,WEN Ze-jun,et al.Flow stress prediction model of LZ92 magnesium lithium alloy[J].Transactions of Materials and Heat Treatment,2020,41(9):147-154.
• [17] Kawasaki M,Kubota K,Higashi K,et al.Flow and cavitation in a quasi-superplastic two-phase magnesium-lithium alloy[J].Materials Science and Engineering A,2006,429(1/2):334-340.
• [18] 宋昊飞，郭俊卿，皇涛，等.LA91超塑性变形力学性能研究[J].塑性工程学报，2018,25(4):167-172.SONG Hao-fei,GUO Jun-qin,HUANG Tao,et al.Research on mechanical properties of LA91 superplastic deformation[J].Journal of Plasticity Engineering,2018,25(4):167-172.
• [19] 吴诗惇.金属超塑性变形理论[M].北京：国防工业出版社，1997.
• [20] Yan T,Le Q C,Jia W T,et al.Microstructure evolution and strengthening mechanism study of Mg-Li alloys during deformation and heat treatment[J].Materials science and Engineering A,2017,704:344-359.
• [21] Liu W H,Liu X,Tang C P,et al.Microstructure and texture evolution in LZ91 magnesium alloy during cold rolling[J].Journal of Magnesium and Alloys,2018,6(1):1-6.
• [22] 江润桐，马香，何思雨，等.多向高速冲击下LZ91镁合金的力学性能及组织[J].有色金属加工，2021,50(1):8-14.JIANG Run-tong,MA Xiang,HE Si-yu,et al.Mechanical properties and microstructure of LZ91 magnesium alloy under multidirectional high speed impact[J].Nonferrous Metals Processing,2021,50(1):8-14.
• [23] 张密林，Elkin F M.镁锂超轻合金[M].北京：科学出版社，2010.
• [24] 刘楚明，刘子娟，朱秀荣，等.镁及镁合金动态再结晶研究进展[J].中国有色金属学报，2006,16(1):1-12.LIU Chu-ming,LIU Zi-juan,ZHU Xiu-rong,et al.Research and development progress of dynamic recrystallization in pure magnesium and its alloys[J].The Chinese Journal of Nonferrous Metal,2006,16(1):1-12.

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