周涛,徐洪辉,钟豪胤,肖华顺

• 1:中南大学粉末冶金国家重点实验室
• 2:上海交通大学材料科学与工程学院

摘要(Abstract)：

采用Ta坩埚真空封装法制备了9种Mg-Gd-Yb-Ag-Zr镁合金,利用显微硬度测试仪、扫描电镜(SEM)和电子探针显微分析(EPMA)等研究了Ag和Yb对Mg-6.0Gd-0.4Zr(GK6)镁合金时效硬化曲线和显微组织的影响。结果表明,Ag和Yb均能显著提高GK6镁合金的时效硬化,且两者同时加入的时效硬化效果更佳。在GK6-1.0Yb-1.0Ag和GK6-2.0Yb-1.0Ag镁合金中,观察到两个时效硬度峰,除颗粒状沉淀析出相外,还分别观察到了脊柱状和绒线状的时效析出相。在GK6-1.0Yb-0.5Ag镁合金中,观察到颗粒状沉淀析出相呈线型排列分布的现象。GK6-2.0Yb-1.0Ag、GK6-1.0Yb-1.0Ag和GK6-1.0Ag镁合金具有优异的时效硬化性能。

关键词(KeyWords)： 稀土镁合金;时效硬化;沉淀析出;显微组织

Abstract:

Keywords:

基金项目(Foundation): 粉末冶金国家重点实验室自主课题

作者(Author): 周涛,徐洪辉,钟豪胤,肖华顺

DOI: 10.13289/j.issn.1009-6264.2019-0243

参考文献(References)：

• [1] Mordike B L.Creep-resistant magnesium alloys[J].Materials Science and Engineering A,2002,324:103-112.
• [2] Vostry P,Smola B,StulíkováI,et al.Microstructure evolution in isochronally heat treated Mg-Gd alloys[J].Physica Status Solidi A,1999,175:491-500.
• [3] 汤伊金,章桢彦,靳丽.等.Mg-Gd系合金时效析出研究进展[J].中国有色金属学报,2014,24(1):8-24.TANG Yi-jin,ZHANG Zhen-yan,JIN Li,et al.Research progress on ageing precipitation of Mg-Gd alloys[J].The Chinese Journal of Nonferrous Metals,2014,24(1):8-24.
• [4] Wang J,Meng J,Zhang D P,et al.Effect of Y for enhanced age hardening response and mechanical properties of Mg-Gd-Y-Zr alloys[J].Materials Science and Engineering A,2007,456:78-84.
• [5] Kent Zheng J X,Luo R C,Zeng X Q,et al.Nano-scale precipitation and phase growth in Mg-Gd binary alloy:An atomic-scale investigation using HAADF-STEM[J].Materials and Design,2018,137:316-324.
• [6] Nodooshan H R J,Wu G H,Liu W C,et al.Effect of Gd content on high temperature mechanical properties of Mg-Gd-Y-Zr alloy[J].Materials Science and Engineering A,2016,651:840-847.
• [7] Kawabata T,Nakagawa D,Saikawa S,et al.Effect of amount of Gd and Y contents on precipitation in MgGdY alloys aged at 473 K[J].Materials Transactions,2013,54:225-230.
• [8] He S M,Zeng X Q,Peng L M,et al.Microstructure and strengthening mechanism of high strength Mg-10Gd-2Y-0.5Zr alloy[J].Journal of Alloys and Compounds,2007,427:316-323.
• [9] Nie J F,Gao X,Zhu S M.Enhanced age hardening response and creep resistance of Mg-Gd alloys containing Zn[J].Scripta Materialia,2005,53:1049-1053.
• [10] Gao X,Nie J F.Enhanced precipitation-hardening in Mg-Gd alloys containing Ag and Zn[J].Scripta Materialia,2008,58:619-622.
• [11] Yang Z,Wang Z H,Duan H B,et al,Microstructure evolution of Mg-6Gd-2Y alloy during solid solution and aging process[J].Materials Science and Engineering A,2015,631:160-165.
• [12] Chen Q W,Tang A T,Ye J H,et al.Equilibrium and metastable phases in a designed precipitation hardenable Mg-3Gd-3Nd-0.6Zr alloy[J].Materials Science and Engineering A,2017,686:26-33.
• [13] Peng Q M,Wu Y M,Fang D Q,et al.Microstructures and mechanical properties of Mg-8Gd-0.6Zr-xNd (x=0,1,2 and 3 mass%) alloys[J].Journal of Materials Science,2007,42:3908-3913.
• [14] Honma T,Wang J,Ohkubo T,et al.Effect of Zn additions on the age-hardening of Mg-2.0Gd-1.2Y-0.2Zr alloys[J].Acta Materialia,2007,55:4137-4150.
• [15] Wang Q D,Chen J,Zhao Z,et al.Microstructure and super high strength of cast Mg-8.5Gd-2.3Y-1.8Ag-0.4Zr alloy[J].Materials Science and Engineering A,2010,528:23-328.
• [16] Zhang Y,Alam T,Gwalani B,et al.On the role of Ag in enhanced age hardening kinetics of Mg-Gd-Ag-Zr alloys[J].Philosophical Magazine Letters,2016,96 (6):212-219.
• [17] Li R G,Xin R L,Liu Q,et al.Effect of Ag addition on microstructure and mechanical properties of Mg-14Gd-0.5Zr alloy[J].Materials Characterization,2015,109:43-49.
• [18] Zhou H,Cheng G M,Ma X L,et al.Effect of Ag on interfacial segregation in Mg-Gd-Y-(Ag)-Zr alloy[J].Acta Materialia,2015,95:20-29.

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