Gd对铸态Mg-4Y-2Sm-0.5Zr合金组织与性能的影响
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摘要
采用光学显微镜、X射线衍射仪、扫描电子显微镜等仪器对铸态Mg-4Y-2Sm-xGd-0. 5Zr(x=0、1、2、3)合金进行了微观组织及物相分析,同时用拉伸试验机对其进行了力学性能测试。研究结果表明:铸态Mg-4Y-2Sm-0. 5Zr合金组织由α-Mg基体、第二相Mg_(24)Y_5和Mg_(41)Sm_5组成;随着稀土元素Gd的加入,合金组织中有Mg_5Gd相生成; Gd含量为1%时,Mg-4Y-2Sm-1Gd-0. 5Zr合金中的第二相分布均匀,晶粒得到细化,综合力学性能达到峰值,抗拉强度为203 MPa,伸长率为12. 68%,与Mg-4Y-2Sm-0. 5Zr合金相比分别提高了50 MPa,8. 46%。随着Gd元素含量的增加,第二相增多且主要沿晶界逐渐呈连续网状析出,力学性能下降。适量Gd元素的加入可以显著改善Mg-4Y-2Sm-0. 5Zr合金的力学性能和伸长率,过量Gd元素的加入则会降低合金的综合力学性能。
The microstructure and phase of the cast Mg-4Y-2Sm-xGd-0. 5Zr( x = 0,1,2,3) alloy were analyzed by means of optical microscope,X ray diffractometer and scanning electron microscope,and the mechanical properties of the alloy were tested by the tensile test machine. The results show that the microstructure of the as-cast Mg-4Y-2Sm-0. 5Zr alloy consists of the matrix of α-Mg,the second phases Mg_(24)Y_5 and Mg41Sm5. With the addition of the rare earth element Gd,the Mg_5Gd phase is formed in the alloy. When the content of Gd is 1%,the second phases in Mg-4Y-2Sm-1Gd-0. 5Zr alloy can be evenly distributed,and the grain is refined. The mechanical properties reach the peak value with the tensile strength 203 MPa and the elongation 12. 68%,compared with the Mg-4Y-2Sm-0. 5Zr alloy,the tensile strength and elongation increased 50 MPa and 8. 46% respectively. With the increase of Gd content,the second phases increases,and most of them gradually appears continuous net precipitated along the grain boundary,and the mechanical properties decrease. The addition of appropriate amount of Gd element can significantly improve the tensile properties and elongation of Mg-4Y-2Sm-0. 5Zr alloy. The addition of excessive Gd elements will reduce the comprehensive mechanical properties of the alloy.
The microstructure and phase of the cast Mg-4Y-2Sm-xGd-0. 5Zr( x = 0,1,2,3) alloy were analyzed by means of optical microscope,X ray diffractometer and scanning electron microscope,and the mechanical properties of the alloy were tested by the tensile test machine. The results show that the microstructure of the as-cast Mg-4Y-2Sm-0. 5Zr alloy consists of the matrix of α-Mg,the second phases Mg_(24)Y_5 and Mg41Sm5. With the addition of the rare earth element Gd,the Mg_5Gd phase is formed in the alloy. When the content of Gd is 1%,the second phases in Mg-4Y-2Sm-1Gd-0. 5Zr alloy can be evenly distributed,and the grain is refined. The mechanical properties reach the peak value with the tensile strength 203 MPa and the elongation 12. 68%,compared with the Mg-4Y-2Sm-0. 5Zr alloy,the tensile strength and elongation increased 50 MPa and 8. 46% respectively. With the increase of Gd content,the second phases increases,and most of them gradually appears continuous net precipitated along the grain boundary,and the mechanical properties decrease. The addition of appropriate amount of Gd element can significantly improve the tensile properties and elongation of Mg-4Y-2Sm-0. 5Zr alloy. The addition of excessive Gd elements will reduce the comprehensive mechanical properties of the alloy.
引文
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[16]刘楚明,朱秀荣,周海涛.镁合金相图集[M].长沙:中南大学出版社,2006:24-63.
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[3]彭建,李敏,杨江,等.时效处理对Mg-10Gd-3Y-0.5Zr合金组织和性能的影响[J].金属热处理,2018,43(1):62-66.Peng Jian,Li Min,Yang Jiang.et al.Effect of aging treatment on microstructure and properties of Mg-10Gd-3Y-0.5Zr alloy[J].Heat Treatment of Metals,2018,43(1):62-66.
[4]杨晓红,彭丽梅,杨晨辉,等.固溶时效Mg-4Y-3Nd合金析出相与基体的微观结构[J].材料热处理学报,2015,36(4):39-43.Yang Xiaohong,Peng Limei,Yang Chenhui,et al.Microstructure of Mg-4Y-3Nd alloy after solution and aging treatment[J].Transactions of Materials and Heat Treatment,2015,36(4):39-43.
[5]Liu K,Chen X G.Development of Al-Mn-Mg 3004 alloy for applications at elevated temperature via dispersoid strengthening[J].Materials and Design,2015,84:340-350.
[6]赵志远.铸造稀土镁合金在我国航空工业中的应用[J].材料工程,1993(7):7-10.Zhao Zhiyuan.The application of RE-containing magnesium casting alloys in aviation industry in China[J].The Journal of Materials Engineering,1993(7):7-10.
[7]Sudholz A D,Birbilis N,Berrles C J,et a1.Corrosion behaviour of Mg-alloy AZ91E with atypical alloying additions[J].Journal of Alloys and Compounds,2009,471(1):109-115.
[8]Aghion E,Bronfm B,Von Buch F,et al.Newly developed magnesium alloys for powertrain applications[J].Journal of Metals,2003,55(11):30-33.
[9]陈君,李全安,张清.钇对AZ6l镁合金组织和性能的影响[J].中国稀土学报,2015,33(4):449-454.Chen Jun,Li Quanan,Zhang Qing.Effect of Y on microstructure and properties of AZ61 magnesium alloy[J].Journal of the Chinese Society of Rare Earths,2015,33(4):449-454.
[10]陈志,李全安,刘文建,等.Mg-12Gd-5Y-1Sm-0.5Zr合金的显微组织和力学性能[J].金属热处理,2013,38(9):71-74.Chen Zhi,Li Quanan,Liu Wenjian,et al.Microstructure and mechanical properties of Mg-12Gd-5Y-1Sm-0.5Zr alloy[J].Heat Treatment of Metals,2013,38(9):71-74.
[11]Li Daquan,Wang Qudong,Ding Wenjiang.Effects of samarium on microstructure and mechanical properties of Mg-Y-Sm-Zr alloys during thermo-mechanical treatments[J].Journal of Materials Science,2009,44:3049-3056.
[12]张清,李全安,井晓天,等.Mg-10Y-1.5Sm合金的组织和力学性能[J].材料热处理学报,2011,32(1):24-27.Zhang Qing,Li Quanan,Jing Xiaotian,et al.Microstructure and mechanical properties of Mg-10Y-1.5Sin alloy[J].Transactions of Materials and Heat Treatment,2011,32(1):24-27.
[13]Zhang Qing,Li Quanan,Jing Xiaotian,et al.Microstructure and mechanical properties of Mg-10Y-2.5Sm alloy[J].Journal of Rare Earths,2010,28(Spec.Issue):357-377.
[14]张奇.Sm对Mg-Gd-Y-Zr合金组织和性能的影响[D].包头:内蒙古科技大学,2015:39-41.Zhang Qi.Effect of Sm addition on microstructure and properties of Mg-Gd-Y-Zr alloy[D].Baotou:Inner Mongolia University of Science and Technology,2015:39-41.
[15]周耀.Sm对Mg-11Gd-2Y-0.5Zr合金组织和性能的影响[D].洛阳:河南科技大学,2017:37-41.Zhou Yao.Effect of Sm on microstructure and properties of Mg-11Gd-2Y-0.5Zr alloy[D].Luoyang:Henan University of Science and Technology,2017:37-41.
[16]刘楚明,朱秀荣,周海涛.镁合金相图集[M].长沙:中南大学出版社,2006:24-63.