张玉,李明,杨文龙,王宗刚,王学志

• 1:河西学院物理与机电工程学院
• 2:河西学院先进材料成形技术研究所

摘要(Abstract)：

利用光学显微镜(OM)、扫描电镜(SEM)、透射电镜(TEM)、X射线衍射仪(XRD)和力学试验机等研究了铸造Mg-6Zn-2.5Cu合金在铸态、固溶和时效处理下的显微组织和力学性能。结果表明:合金的铸态组织主要由α-Mg和(α-Mg+MgZn_2+Mg_2Cu+CuZnMg)共晶相组成。在455℃固溶12～36 h时,随着时间增加,固溶效果逐渐增强,且在20 h时合金获得了较理想的显微组织及218 MPa的抗拉强度和8.68%的伸长率。随后在180℃时效6～72 h后,合金的拉伸性能随时效时间的增加呈先增加后减小的趋势,其中时效24 h时后,合金的抗拉强度和硬度达到峰值,分别为249.5 MPa和64.6 HV0.1,比铸态的分别提高了66.5 MPa和26.29%,伸长率在时效12 h时后达到了峰值6.72%。铸态合金的断裂方式以沿晶断裂为主,时效处理后合金的断裂方式为准解理断裂。

关键词(KeyWords)： Mg-6Zn-2.5Cu镁合金;固溶处理;时效处理;显微组织;力学性能

Abstract:

Keywords:

基金项目(Foundation): 河西学院博士科研启动基金;河西学院校长基金(XZ2018014)

作者(Author): 张玉,李明,杨文龙,王宗刚,王学志

DOI: 10.13289/j.issn.1009-6264.2019-0451

参考文献(References)：

• [1] 李萧,刘江文,罗承萍.铸造ZC62镁合金的时效行为[J].金属学报,2006,42(7):733-738.LI Xiao,LIU Jiang-wen,LUO Cheng-ping.Precipitation behavior of cast ZC62 magnesium alloy[J].Acta Metallurgica Sinica,2006,42(7):733-738.
• [2] Langelier B,Sha A,Korinek A,et al.The effects of microalloy on the precipitate microstruture at grain boundary regions in an Mg-Zn-based alloy[J].Materials and Design,2017,119:290-296.
• [3] 李爱文,刘江文,伍翠兰,等.铸造Mg-3Zn-1.5Cu-0.6Zr镁合金的时效硬化及析出相[J].中国有色金属学报,2010,20(6):1053-1059.LI Ai-wen,LIU Jiang-wen,WU Cui-lan,et al.Age-hardening behavior and precipitates of as-cast Mg-3Zn-1.5Cu-0.6Zr Mg alloy[J].The Chinese Journal of Nonferrous Metals,2010,20(6):1053-1059.
• [4] 彭建,吕滨江,潘复生,等.高塑性Mg-Zn系稀土镁合金的研究进展[J].热加工工艺,2010,39(18):15-19.PENG Jian,Lü Bin-jiang,PAN Fu-sheng,et al.Advances in high plasticity Mg-Zn-based rare-earth magnesium alloys[J].Hot Working Technology,2010,39 (18):15-19.
• [5] Hu X Y,Fu P H,Stjohn D,et al.On grain coarsening and re?ning of the Mg-3Al alloy by Sm[J].Journal of Alloys and Compounds,2016,663:387-394.
• [6] Bhattacharjee T,Mendis C L,Oh-ishi K,et al.The effect of Ag and Ca additions on the age hardening response of Mg-Zn alloys[J].Materials Science & Engineering A,2013,575:231-240.
• [7] Cheng R J,Pan F S,Yang M B,et al.Effects of various Mg-Sr mater alloys on microstructural refinement of ZK60 magnesium alloy[J].Transactions of Nonferrous Metals Society of China,2018,18:50-54.
• [8] Buha J.The effect of Ba on the microstructure and age hardening of an Mg-Zn alloy[J].Materials Science & Engineering A,2008,491:70-79.
• [9] Qi F G,Zhang D F,Zhang X H,et al.Effect of Sn addition on the microstructure and mechanical properties of Mg-6Zn-1Mn (wt.%) alloy[J].Journal of Alloys and Compounds,2014,585:656-666.
• [10] He M L,Luo T J,Liu Y T,et al.Effects of Cu and Ce co-addition on the microstructure and mechanical properties of Mg-6Zn-0.5Zr alloy[J].Journal of Alloys and Compounds,2018,767:1216-1224.
• [11] 王渠东,曾小勤,吕宜振,等.高温铸造镁合金的研究与应用[J].材料导报,2000,16(3):21-23.WANG Qu-dong,CENG Xiao-qin,Lü Yi-zhen.et al.Study and application of elevateed temperature cast magnesium alloy[J].Materias Review,2000,16(3):21-23.
• [12] Buha J,Ohkubo T.Natural aging in Mg-Zn(-Cu) alloys[J].Metallurgical and Materials Transactions A,2008,39(9):2259-2273.
• [13] 黄晓锋,张玉,秦牧岚,等.均匀化热处理对铸造ZC62镁合金显微组织和力学性能的影响[J].材料热处理学报,2016,37(7):69-76.HUANG Xiao-feng,ZHANG Yu,QIN Mu-lan,et al.Effects of homogenization treatment on microstructure and mechanical properties of ZC62 magnesium alloy[J].Transactions of Materials and Heat Treatment,2016,37(7):69-76.
• [14] 李爱文,刘江文,伍翠兰,等.Cu含量对铸造Mg-3Zn-xCu-0.6Zr 镁合金时效析出行为的影响[J].中国有色金属学报,2010,20(8):1487-1494.LI Ai-wen,LIU Jiang-wen,WU Cui-lan,et al.Effects of Cu addition on aging precipitation behavior of cast Mg-3Zn-xCu-0.6Zr magnesium alloys[J].The Chinese Journal of Nonferrous Metals,2010,20(8):1487-1494.
• [15] Gao X,Nie J F.Structure and thermal stability of primary intermetallic particles in an Mg-Zn casting alloy[J].Scripta Materialia,2007,57(7):655-658.
• [16] 温麒,石巨岩,张保平,等.固溶处理对Mg-xZn-2Gd合金组织及性能的影响[J].热加工工艺,2014,43(22):190-194.WEN Qi,SHI Ju-yan,ZHANG Bao-ping,et al.Effects of solution treatment on microstructure and mechanical properties of Mg-xZn-2Gd alloy[J].Hot Working Technology,2014,43(22):190-194.
• [17] Chen X H,Liu L Z,Pan F S.Microstructure,electromagnetic shielding effectiveness and mechanical properties of Mg-Zn-Cu-Zr alloys[J].Materials Science and Engineering B,2015,197(1):67-74.
• [18] 肖阳,张新明,陈健美,等.Mg-15Gd-0.6Zr合金的组织与力学性能[J].中国有色金属学报,2006,16(11):1888-1894.XIAO Yang,ZHANG Xin-yang,CHEN Jian-mei,et al.Microstructures and mechanical properties of Mg-15Gd-0.6Zr alloy[J].The Chinese Journal of Nonferrous Metals,2006,16(11):1888-1894.

文章评论(Comment)：