热处理对Mg-Y-Zn-Ag稀土镁合金长周期组织结构的影响
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摘要
研究了不同Ag含量的Mg-Y-Zn-Ag稀土镁合金经过热处理后的组织和力学性能的变化。结果发现,在稀土镁合金中添加Ag后,经过热处理后,晶粒尺寸明显细化,合金中LPSO相(长周期堆垛有序结构)细化显著,同时Ag_2Mg和MgAg相分布更加均匀。通过500℃×24 h固溶和200℃×20 h时效后,合金的力学性能提升显著。当合金中加入Ag含量为3%时(质量分数,下同),合金性能最佳,抗拉强度和伸长率分别为194 MPa和7. 1%。Ag含量为2%时,500℃固溶处理24 h,合金达到了最高显微硬度为81. 2 HV0. 2,对比铸态原始合金显微硬度提升显著。
Microstructure and mechanical properties of Mg-Y-Zn-Ag rare earth magnesium alloy after different heat treatments were studied.The results show that with addition of Ag,the grain size and LPSO phase (long-period stacking order structure) of the Mg-Y-Zn-Ag rare earth magnesium alloy are significantly refined,and the distribution of Ag_2Mg and MgAg phases in the alloy is more uniform. After 500 ℃ ×24 h solution treatment and 200 ℃ × 20 h aging,the mechanical properties of the alloy are improved significantly. When the content of Ag is 3% (mass fraction,the same below),the alloy has the best properties,the tensile strength and elongation are 194 MPa and 7. 1%,respectively. When the content of Ag is 2%,and treated at 500 ℃ for 24 h,the maximum microhardness of the alloy is 81. 2 HV0. 2,which is significantly improved compared with that of the as-cast alloy.
Microstructure and mechanical properties of Mg-Y-Zn-Ag rare earth magnesium alloy after different heat treatments were studied.The results show that with addition of Ag,the grain size and LPSO phase (long-period stacking order structure) of the Mg-Y-Zn-Ag rare earth magnesium alloy are significantly refined,and the distribution of Ag_2Mg and MgAg phases in the alloy is more uniform. After 500 ℃ ×24 h solution treatment and 200 ℃ × 20 h aging,the mechanical properties of the alloy are improved significantly. When the content of Ag is 3% (mass fraction,the same below),the alloy has the best properties,the tensile strength and elongation are 194 MPa and 7. 1%,respectively. When the content of Ag is 2%,and treated at 500 ℃ for 24 h,the maximum microhardness of the alloy is 81. 2 HV0. 2,which is significantly improved compared with that of the as-cast alloy.
引文
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[3]任英磊,热焱,刘云秋,等.高强度Mg-Zn-Ca-Al合金的研究[J].铸造,2009,58(2):101-103.Ren Yinglei,Re Yan,Liu Yunqiu,et al.High strength Mg-Zn-Ca-Al casting alloys[J].Foundry,2009,58(2):101-103.
[4]王华,岳学庆,李韦璇.挤压铸造压力对Mg-Al-Ca镁合金组织及力学性能的影响[J].金属热处理,2015,40(4):102-104.Wang Hua,Yue Xueqing,Li Weixuan.Effect of squeeze casting pressure on microstructure and mechanical properties of Mg-Al-Ca magnesium alloy[J].Heat Treatment of Metals,2015,40(4):102-104.
[5]秦国帅,杨汉嵩,何春霞.高强Al-Zn-Mg系7075合金热处理工艺[J].金属热处理,2015,40(12):92-96.Qin Guoshuai,Yang Hansong,He Chunxia.Heat treatment technology of high strength Al-Zn-Mg series 7075 alloy[J].Heat Treatment of Metals,2015,40(12):92-96.
[6]张志俊.热处理工艺对Mg-Nd-Gd-Zn稀土镁合金组织与性能的影响[J].轻金属,2010,38(1):51-53.Zhang Zhijun.Effect of heat treatment on the microstructure and mechanical properties of Mg-Nd-Gd-Zn alloy[J].Light Metals,2010,38(1):51-53.
[7]陈鼎,张艳斌,王维.Y对高锌镁合金的拉伸蠕变行为的影响[J].湖南大学学报(自科版),2015(6):53-59.Chen Ding,Zhang Yanbin,Wang Wei.Tensile creep behavior of Yaddition in high zinc magnesium alloy[J].Journal of Hunan University(Natural Sciences),2015(6):53-59.
[8]卢志文,仲志国,刘克涛,等.高温高压下Ag-Mg-Zn合金中金属间化合物的微观结构与热动力学性质的第一性原理计算[J].物理学报,2013,62(1):334-342.Lu Zhiwen,Zhong Zhiguo,Liu Ketao,et al.First-principles calculations of microstructure and thermodynamic properties of the intermetallic compound in Ag-Mg-Zn alloy under high pressure and high temperature[J].Acta Physica Sinica,2013,62(1):334-342.
[9]王海刚,王智民.Ni对AZ102镁合金组织及力学性能的影响[J].铸造,2013,62(4):315-318.Wang Haigang,Wang Zhimin.Effect of Ni on microstructures and mechanical properties of AZ102 magnesium alloys[J].Foundry,2013,62(4):315-318.
[10]许娟,李鹏飞,郭锋.Y对AZ91D镁合金铸态组织和性能的影响[J].轻金属,2009(7):46-48.Xu Juan,Li Pengfei,Guo Feng.Effect of Y on as-cast microstructure and properties of AZ91D magnesium alloy[J].Light Metals,2009(7):46-48.
[11]王志峰,丁俭,李永艳,等.稀土元素Ce、Nd对AZ91镁合金显微组织、显微硬度及起燃温度的影响[J].中国铸造装备与技术,2011(4):8-11.Wang Zhifeng,Ding Jian,Li Yongyan,et al.Effect of RE,Ce and Nd on microstructure,microhardness and ignition point of Mg alloy AZ91[J].China Foundry Machinery and Technology,2011(4):8-11.
[12]吴国华,孙明,王玮,等.镁合金纯净化研究新进展[J].中国有色金属学报,2010,20(6):1021-1031.Wu Guohua,Sun Ming,Wang Wei,et al.Recent advances in pure purification of magnesium alloys[J].Transactions of Nonferrous Metals Society of China,2010,20(6):1021-1031.