Ag对铸态Mg-11Gd-2Y-0.5Zr镁合金组织和力学性能的影响
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摘要
采用X射线衍射仪、光学显微镜、扫描电镜,能谱仪和电子拉伸试验机等研究了不同Ag含量对铸态Mg-11Gd-2Y-0.5Zr镁合金的物相、显微组织和拉伸断裂后形貌的影响。结果表明:Ag的添加能在合金中形成新相Ag_2Gd,同时能够提高合金的抗拉强度,细化合金组织,促进第二相在晶界处的析出;当Ag的添加量为1.5%时,合金的抗拉强度达到最大值226 MPa;当Ag的添加量为2%时,合金的晶粒尺寸最小,为46.5μm,第二相的析出最多。
Effects of Ag content on phase, microstructure and morphology of as-cast Mg-11 Gd-2 Y-0.5 Zr magnesium alloy were studied by means of X-ray diffractometer, optical microscope, scanning electron microscope, energy dispersive spectrometer analysis and electronic tensile testing machine. The results show that the addition of Ag can form a new phase Ag_2Gd in the alloy and improve the tensile strength of the alloy, refine the microstructure of the alloy and promote the precipitation of the second phase at the grain boundary. When the addition of Ag is 1.5%, the tensile strength of the Mg-11 Gd-2 Y-1.5 Ag-0.5 Zr alloy reaches the maximum value of 226 MPa. When the addition of Ag is 2%, the grain size of the Mg-11 Gd-2 Y-2 Ag-0.5 Zr alloy is the smallest, which is 46.5 μm, and the precipitation of the second phase is the most.
Effects of Ag content on phase, microstructure and morphology of as-cast Mg-11 Gd-2 Y-0.5 Zr magnesium alloy were studied by means of X-ray diffractometer, optical microscope, scanning electron microscope, energy dispersive spectrometer analysis and electronic tensile testing machine. The results show that the addition of Ag can form a new phase Ag_2Gd in the alloy and improve the tensile strength of the alloy, refine the microstructure of the alloy and promote the precipitation of the second phase at the grain boundary. When the addition of Ag is 1.5%, the tensile strength of the Mg-11 Gd-2 Y-1.5 Ag-0.5 Zr alloy reaches the maximum value of 226 MPa. When the addition of Ag is 2%, the grain size of the Mg-11 Gd-2 Y-2 Ag-0.5 Zr alloy is the smallest, which is 46.5 μm, and the precipitation of the second phase is the most.
引文
[1] Wang J,Luo L,Huo Q H,et al.Creep behaviors of a highly concentrated Mg-18 mass% Gd binary alloy with and without artificial aging[J].Journal of Alloys and Compounds,2019,774:1036-1045.
[2] 付三玲,李全安,井晓天,等.Gd含量对Mg-Gd-Sm-Zr合金组织和性能影响[J].材料热处理学报,2016,37(8):41-46.FU San-ling,LI Quan-an,JING Xiao-tian,et al.Effect of Gd content on microstructure and mechanical properties of Mg-Gd-Sm-Zr alloy[J].Transactions of Materials and Heat Treatment,2016,37(8):41-46.
[3] 赵亚忠,彭建,刘蒙恩,等.Mg-1.9Zn-0.9Mn-xNd合金铸态组织与力学性能[J].材料热处理学报,2018,39(6):42-48.ZHAO Ya-zhong,PENG Jian,LIU Meng-en,et al.Microstructure and mechanical properties of as-cast Mg-1.9Zn-0.9Mn-xNd magnesium alloys[J].Transactions of Materials and Heat Treatment,2018,39(6):42-48.
[4] 张志强,李佳浩,黄镇,等.Mg-10Gd-3Y-0.6Zr-1Ag镁合金热压缩变形行为研究[J].材料科学与工艺,2014,22(6):1-5.ZHANG Zhi-qiang,LI Jia-hao,HUANG Zhen,et al.Hot compression deformation behavior of the Mg-10Gd-3Y-0.6Zr-1Ag magnesium alloy[J].Materials Science and Technology,2014,22(6):1-5.
[5] Ning H Y,Yu Y D,Gao B,et al.Grain refinement and aging hardening of the Mg-10Gd-3Y-2Ag-0.4Zr alloy produced by a two-step forming process[J].Materials,2018,11(5):1-11.
[6] 李玲,辛仁龙.预变性对Mg-Gd-Ag-Zr合金时效硬化行为与力学性能的影响[J].材料导报,2014,28(11):436-438.LI Ling,XIN Ren-long.Effect of pre-deformation on aging hardening and mechanical property of Mg-Gd-Y-Zr alloy[J].Materials Review,2014,28(11):436-438.
[7] Zhou H,Wang Q D,Chen J,et al.Microstructure and mechanical properties of extruded Mg-8.5Gd-2.3Y-1.8Ag-0.4Zr alloy[J].Transactions of Nonferrous Metals Society of China,2012,22(8):1891-1895.
[8] Movahedi-Rad A,Mahmudi R.Effect of Ag addition on the elevated-temperature mechanical properties of an extruded high strength Mg-Gd-Y-Zr alloy[J].Materials Science and Engineering A,2014,614:62-66.
[9] Movahedi-Rad A,Mahmudi R,Wu G H,et al.Enhanced superplasticity in an extruded high strength Mg-Gd-Y-Zr alloy with Ag addition[J].Journal of Alloys and Compounds,2015,626:309-313.
[10] 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.
[11] Wang B Z,Liu C M,Gao Y H,et al.Microstructure evolution and mechanical properties of Mg-Gd-Y-Ag-Zr alloy fabricated by multidirectional forging and ageing treatment[J].Materials Science and Engineering A,2017,702:22-28.
[12] 付三玲.Mg-Gd(-Y-Sm-Zr)耐热镁合金组织和性能研究[D].西安:西安理工大学,2016.FU San-ling.Study on the microstructure and mechanical properties of Mg-Gd(-Y-Sm-Zr) heat resistant magnesium alloys[D].Xi’an:Xi’an University of Technology,2016.
[13] 李克艳,薛冬峰.电负性概念的新拓展[J].科学通报,2008,53(20):2442-2448.LI Ke-yan,XUE Dong-feng.New development of the concept of electronegativity[J].Chinese Science Bulletin,2008,53(20):2442-2448.
[14] Yuan W,Panigrahi S K,Su J Q,et al.Influence of grain size and texture on Hall-Petch relationship for a magnesium alloy[J].Scripta Materialia,2011,65:994-997.
[15] 冯凯,黄晓锋,马颖,等.钕对Mg7Zn2Al镁合金显微组织及力学性能的影响[J].中国稀土学报,2012,30(2):168-174.FENG Kai,HUANG Xiao-feng,MA Ying,et al.Effect of rare earth neodymium on microstructure and mechanical properties of Mg7Zn2Al magnesium alloy[J].Journal of the Chinese Society of Rare Earths,2012,30(2):168-174.
[2] 付三玲,李全安,井晓天,等.Gd含量对Mg-Gd-Sm-Zr合金组织和性能影响[J].材料热处理学报,2016,37(8):41-46.FU San-ling,LI Quan-an,JING Xiao-tian,et al.Effect of Gd content on microstructure and mechanical properties of Mg-Gd-Sm-Zr alloy[J].Transactions of Materials and Heat Treatment,2016,37(8):41-46.
[3] 赵亚忠,彭建,刘蒙恩,等.Mg-1.9Zn-0.9Mn-xNd合金铸态组织与力学性能[J].材料热处理学报,2018,39(6):42-48.ZHAO Ya-zhong,PENG Jian,LIU Meng-en,et al.Microstructure and mechanical properties of as-cast Mg-1.9Zn-0.9Mn-xNd magnesium alloys[J].Transactions of Materials and Heat Treatment,2018,39(6):42-48.
[4] 张志强,李佳浩,黄镇,等.Mg-10Gd-3Y-0.6Zr-1Ag镁合金热压缩变形行为研究[J].材料科学与工艺,2014,22(6):1-5.ZHANG Zhi-qiang,LI Jia-hao,HUANG Zhen,et al.Hot compression deformation behavior of the Mg-10Gd-3Y-0.6Zr-1Ag magnesium alloy[J].Materials Science and Technology,2014,22(6):1-5.
[5] Ning H Y,Yu Y D,Gao B,et al.Grain refinement and aging hardening of the Mg-10Gd-3Y-2Ag-0.4Zr alloy produced by a two-step forming process[J].Materials,2018,11(5):1-11.
[6] 李玲,辛仁龙.预变性对Mg-Gd-Ag-Zr合金时效硬化行为与力学性能的影响[J].材料导报,2014,28(11):436-438.LI Ling,XIN Ren-long.Effect of pre-deformation on aging hardening and mechanical property of Mg-Gd-Y-Zr alloy[J].Materials Review,2014,28(11):436-438.
[7] Zhou H,Wang Q D,Chen J,et al.Microstructure and mechanical properties of extruded Mg-8.5Gd-2.3Y-1.8Ag-0.4Zr alloy[J].Transactions of Nonferrous Metals Society of China,2012,22(8):1891-1895.
[8] Movahedi-Rad A,Mahmudi R.Effect of Ag addition on the elevated-temperature mechanical properties of an extruded high strength Mg-Gd-Y-Zr alloy[J].Materials Science and Engineering A,2014,614:62-66.
[9] Movahedi-Rad A,Mahmudi R,Wu G H,et al.Enhanced superplasticity in an extruded high strength Mg-Gd-Y-Zr alloy with Ag addition[J].Journal of Alloys and Compounds,2015,626:309-313.
[10] 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.
[11] Wang B Z,Liu C M,Gao Y H,et al.Microstructure evolution and mechanical properties of Mg-Gd-Y-Ag-Zr alloy fabricated by multidirectional forging and ageing treatment[J].Materials Science and Engineering A,2017,702:22-28.
[12] 付三玲.Mg-Gd(-Y-Sm-Zr)耐热镁合金组织和性能研究[D].西安:西安理工大学,2016.FU San-ling.Study on the microstructure and mechanical properties of Mg-Gd(-Y-Sm-Zr) heat resistant magnesium alloys[D].Xi’an:Xi’an University of Technology,2016.
[13] 李克艳,薛冬峰.电负性概念的新拓展[J].科学通报,2008,53(20):2442-2448.LI Ke-yan,XUE Dong-feng.New development of the concept of electronegativity[J].Chinese Science Bulletin,2008,53(20):2442-2448.
[14] Yuan W,Panigrahi S K,Su J Q,et al.Influence of grain size and texture on Hall-Petch relationship for a magnesium alloy[J].Scripta Materialia,2011,65:994-997.
[15] 冯凯,黄晓锋,马颖,等.钕对Mg7Zn2Al镁合金显微组织及力学性能的影响[J].中国稀土学报,2012,30(2):168-174.FENG Kai,HUANG Xiao-feng,MA Ying,et al.Effect of rare earth neodymium on microstructure and mechanical properties of Mg7Zn2Al magnesium alloy[J].Journal of the Chinese Society of Rare Earths,2012,30(2):168-174.