费翔,卢松鹤,闫宏,陈荣石

• 1:中国科学技术大学纳米科学技术学院
• 2:中国科学院金属研究所师昌绪先进材料创新中心

摘要(Abstract)：

采用冲击实验研究了热处理工艺对Mg-5Y-3Nd-1Gd-0.4Zr镁合金U型缺口和无缺口试样的冲击韧性的影响,同时研究了时效时间对于时效态样品冲击性能缺口敏感性的影响。结果表明:固溶处理后合金的冲击韧性最高,断口形貌具有韧脆混合断裂特征,而时效后合金的冲击韧性迅速降低,断口形貌呈现脆性断裂的特征。这是由于固溶处理后合金的组织为单相组织,晶粒间和晶粒内协调性好,而时效处理后组织中析出大量第二相,在冲击变形过程中这些第二相阻碍位错运动,导致材料强度提高而韧性迅速降低。随着时效时间的延长,合金的室温缺口敏感性几乎不发生变化。当冲击温度提高到200℃时,缺口敏感性相对室温增加,这是由于存在缺口时,冲击过程几乎不发生塑性变形。提高实验温度,有缺口试样的冲击韧性增幅比无缺口试样的冲击韧性增幅要小的多,试样缺口敏感性也会增大。

关键词(KeyWords)： 镁合金;热处理;冲击韧性;缺口敏感性

Abstract:

Keywords:

基金项目(Foundation): 国家科技重大专项(017ZX04014001);; 国家重点研究开发计划项目(2016YFB0301104);; 国家自然科学基金(51531002,51301173,51601193,51701218);; 辽宁省自然科学基金(2020-MS-004,20180550799)

作者(Author): 费翔,卢松鹤,闫宏,陈荣石

DOI: 10.13289/j.issn.1009-6264.2020-0345

参考文献(References)：

• [1] Aghion E,Bronfin B.Magnesium alloys development towards the 21st century[J].Materials Science Forum,2000,350/351:19-30.
• [2] 唐靖林，曾大本.镁合金的应用发展现状[J].金属加工(热加工),2002(9):37-40.TANG Jing-lin,ZENG Da-ben.Application development status of magnesium alloy[J].Machinist Metal Forming,2002(9):37-40.
• [3] Luo A A.Recent magnesium alloy development for elevated temperature applications[J].International Materials Reviews,2004,49(1):13-30.
• [4] Liu W H B,Qi W J,Huang Z H.Research development on purification technology of magnesium alloy melt[J].Foundry,2015,64(6):521-527.
• [5] 黄晓锋，王渠东，曽晓勤.稀土对AM50力学性能及高温蠕变的影响[J].中国稀土学报，2004(4):75-78.HUANG Xiao-feng,WANG Qu-dong,ZENG Xiao-qin.Influence of rare earth on mechanical properties and high temperature creep properties of AM50 magnesium alloy[J].Journal of the Chinese Rare Earth Society,2004(4):75-78.
• [6] 杨力祥，肖旅，周海涛，等.高强耐热稀土镁合金研究进展[J].上海航天，2019,36(2):42-48.YANG Li-xiang,XIAO Lü,ZHOU Hai-tao,et al.Current development of high-strength heat-resistant rare earth magnesium alloy[J].Aerospace Shanghai,2019,36(2):42-48.
• [7] Wang J,Meng J,Zhang D,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(1/2):78-84.
• [8] Krzysztof,Aniolek,Michal.The influence of solution treatment on the structure and mechanical and tribological properties of magnesium alloy WE54[J].Tribologia,2016(3):19-28.
• [9] Zhou X.Effects of secondary ageing on precipitate distribution and mechanical properties of magnesium alloy WE54[D].Australia:Monash University,2014:1-238.
• [10] 胡茂良，朱瑶，王渠东，等.Mg-Gd-Y-Zn-Zr合金冲击断裂机理研究[J].哈尔滨工程大学学报，2017,38(2):304-308.HU Mao-liang,ZHU Yao,WANG Qu-dong,et al.Impact fracture mechanism of Mg-Gd-Y-Zn-Zr magnesium alloy[J].Journal of Harbin Engineering University,2017,38(2):304-308.
• [11] Barylski A,Anio?ek K,Dworak M.The influence of solution treatment on the structure and mechanical and tribological properties of magnesium alloy WE54[J].Tribologia,2016(3):19-28.
• [12] Kang Y H,Yan H,Chen R S.Effects of heat treatment on the precipitates and mechanical properties of sand-cast Mg-4Y-2.3Nd-1Gd-0.6Zr magnesium alloy[J].Materials Science and Engineering A,2015,645:361-368.
• [13] GB/T 6394—2002.金属平均晶粒度测定方法[S].中华人民共和国国家标准，2002.
• [14] Nie J,Muddle B.Characterisation of strengthening precipitate phases in a Mg-Y-Nd alloy[J].Acta Materialia,2000 (48):1691-1703.
• [15] Li J L,Zhang N,Wang X X,et al.Effect of solution treatment on the microstructure and mechanical properties of sand-cast Mg-9Gd-4Y-0.5Zr alloy[J].Acta Metallurgica Sinica,2018(31):189-198.
• [16] Zhu S M,Nie J F,Gibson M A,et al.On the unexpected formation of rare earth hydrides in magnesium-rare earth casting alloys[J].Scripta Materialia,2014(77):21-24.

文章评论(Comment)：