往复挤压Mg-xSn-Al-Zn-Si合金的组织性能及变形机制
|
摘要
以往复挤压Mg-x Sn-1. 5Al-1Zn-1Si(x=3、5、8,质量分数,%)合金为研究对象,分析了合金的组织分布、力学性能和变形机制。结果表明:往复挤压合金的晶粒细小、组织均匀,随着Sn的增加,其均匀度呈现先升高后降低的趋势;往复挤压合金的强度和塑性较高,随着Sn含量的增加,合金强度和塑性呈现先增加后下降的趋势,Sn含量较高时,塑性明显下降;往复挤压过程中,Mg-xSn-1.5Al-1Zn-1Si合金更容易发生动态再结晶,位错攀移(滑移)成为变形的主要机制,位错密度呈现由增加到动态平衡再到下降的变化趋势。
The microstructure distribution,mechanical properties and deformation mechanism of Mg-xSn-1.5Al-1Zn-1Si( x = 3,5 and 8,mass fraction,%) reciprocating extrusion alloy were investigated. The results indicate that the reciprocating extrusion alloy has fine grain size and uniform structure,and the uniformity first increases and then decreases with the increase of Sn content. The strength and plasticity of the reciprocating extrusion alloy are relative high,and increase first then decrease with the increase of Sn content. When the Sn content is higher,the plasticity descends obviously. During extrusion process,dynamic recrystallization occurs quite easily in Mg-xSn-1.5Al-1Zn-1Si alloy,dislocation climb( or slip) becomes the main deformation mechanism,and dislocation density first increases to reach the dynamic equilibrium state,then decreases.
The microstructure distribution,mechanical properties and deformation mechanism of Mg-xSn-1.5Al-1Zn-1Si( x = 3,5 and 8,mass fraction,%) reciprocating extrusion alloy were investigated. The results indicate that the reciprocating extrusion alloy has fine grain size and uniform structure,and the uniformity first increases and then decreases with the increase of Sn content. The strength and plasticity of the reciprocating extrusion alloy are relative high,and increase first then decrease with the increase of Sn content. When the Sn content is higher,the plasticity descends obviously. During extrusion process,dynamic recrystallization occurs quite easily in Mg-xSn-1.5Al-1Zn-1Si alloy,dislocation climb( or slip) becomes the main deformation mechanism,and dislocation density first increases to reach the dynamic equilibrium state,then decreases.
引文
[1]Luo J H,Qiu K H,Wang J,et al.Microstructure and mechanical properties of Mg-7Zn-3Al alloy with Nd and Y additions[J].Journal of Rare Earths,2012,30(5):486-491.
[2]Kimi Y H,Son H T.Effects of Li addition on microstructure and mechanical properties of Mg-6Al-2Sn-0.4Mn alloys[J].Transactions of Nonferrous Metals Society of China,2016,26(3):697-703.
[3]林金保,任伟杰,王心怡.镁合金织构演化晶体塑性力学模型的研究进展[J].材料导报,2016,30(1):102-105.Lin Jinbao,Ren Weijie,Wang Xinyi.Research progress of crystal plasticity mechanics model in texture evolution of magnesium alloy[J].Materials Review,2016,30(1):102-105.
[4]张辉,彭金华,张真,等.AZ31镁合金压缩孪晶对组织及性能的影响[J].金属热处理,2017,42(3):108-112.Zhang Hui,Peng Jinhua,Zhang Zhen,et al.Effect of compression twin on microstructure and properties of AZ31 magnesium alloy[J].Heat Treatment of Metals,2017,42(3):108-112.
[5]李权,彭建,宋维波,等.稀土钕对ZK20镁合金铸态组织和力学性能的影响[J].功能材料,2015,46(S2):120-124.Li Quan,Peng Jian,Song Weibo,et al.Effects of Nd on cast microstructure and mechanical properties of ZK60 magnesium alloy[J].Journal of Functional Materials,2015,46(S2):120-124.
[6]张建新,高爱华,郭学锋,等.往复挤压工艺对Mg-5Sn-1.5Al-1Zn-1Si合金组织演变的影响[J].中国有色金属学报,2014,24(12):2978-2983.Zhang Jianxin,Gao Aihua,Guo Xuefeng,et al.Effect of reciprocating extrusion process on microstructure evolution of Mg-5Sn-1.5Al-1Zn-1Si magnesium alloy[J].The Chinese Journal of Nonferrous Metals,2014,24(12):2978-2983.
[7]郭学锋,杨文朋,宋佩维.往复挤压Mg-Al-Si合金的高温拉伸性能[J].材料热处理学报,2012,33(2):7-11.Guo Xuefeng,Yang Wenpeng,Song Peiwei.Elevated temperature tensile properties of Mg-Al-Si alloys prepared by reciprocating extrusion[J].Transactions of Materials and Heat Treatment,2012,33(2):7-11.
[8]夏显明,谢瑞,薛克敏,等.往复挤压对挤压态ZK60镁合金微观组织和力学性能的影响[J].塑性工程学报,2017,24(3):78-82.Xia Xianming,Xie Rui,Xue Kemin,et al.Effect of cyclic extrusion and compression on microstructure and mechanical properties of extruded ZK60 magnesium alloy[J].Journal of Plasticity Engineering,2017,24(3):78-82.
[9]杨文朋,郭学锋,梁世何.Ce对往复挤压低温正挤压Mg-Zn-Ce合金组织和力学性能的影响[J].中国有色金属学报,2015,25(12):3336-3341.Yang Wenpeng,Guo Xuefeng,Liang Shihe.Effects of Ce on microstructures and mechanical properties of Mg-Zn-Ce alloys processed by reciprocating extrusion and low-temperature forward extrusion[J].The Chinese Journal of Nonferrous Metals,2015,25(12):3336-3341.
[10]Lee S,Chen Y L,Wang H Y,et al.On mechanical properties and superplasticity of Mg-15Al-1Zn alloys processed by reciprocating extrusion[J].Materials Science and Engineering A,2007,464(1/2):76-82.
[11]Wang L P,Chen T,Jiang W Y,et al.Microstructure and mechanical properties of AM60B magnesium alloy prepared by cyclic extrusion compression[J].Transactions of Nonferrous Metals Society of China,2013,23(11):3200-3205.
[12]韩飞,陈刚,刘洪伟,等.铸态ZK60镁合金往复挤压的组织与性能[J].精密成形工艺,2017,9(2):40-44.Han Fei,Chen Gang,Liu Hongeei,et al.Microstructure and properties of cyclic extrusion and compression using as-cast ZK60magnesium alloy[J].Journal of Netshape Forming Engineering,2017,9(2):40-44.
[13]林金保.往复挤压ZK60与GW102K镁合金的组织演变及强韧化机制研究[D].上海:上海交通大学,2009.Lin Jinbao.Microstructure evolution and strengthening mechanism of ZK60 and GW102K alloys fabricated by cyclic extrusion and compression[D].Shanghai:Shanghai Jiao Tong University,2009.
[2]Kimi Y H,Son H T.Effects of Li addition on microstructure and mechanical properties of Mg-6Al-2Sn-0.4Mn alloys[J].Transactions of Nonferrous Metals Society of China,2016,26(3):697-703.
[3]林金保,任伟杰,王心怡.镁合金织构演化晶体塑性力学模型的研究进展[J].材料导报,2016,30(1):102-105.Lin Jinbao,Ren Weijie,Wang Xinyi.Research progress of crystal plasticity mechanics model in texture evolution of magnesium alloy[J].Materials Review,2016,30(1):102-105.
[4]张辉,彭金华,张真,等.AZ31镁合金压缩孪晶对组织及性能的影响[J].金属热处理,2017,42(3):108-112.Zhang Hui,Peng Jinhua,Zhang Zhen,et al.Effect of compression twin on microstructure and properties of AZ31 magnesium alloy[J].Heat Treatment of Metals,2017,42(3):108-112.
[5]李权,彭建,宋维波,等.稀土钕对ZK20镁合金铸态组织和力学性能的影响[J].功能材料,2015,46(S2):120-124.Li Quan,Peng Jian,Song Weibo,et al.Effects of Nd on cast microstructure and mechanical properties of ZK60 magnesium alloy[J].Journal of Functional Materials,2015,46(S2):120-124.
[6]张建新,高爱华,郭学锋,等.往复挤压工艺对Mg-5Sn-1.5Al-1Zn-1Si合金组织演变的影响[J].中国有色金属学报,2014,24(12):2978-2983.Zhang Jianxin,Gao Aihua,Guo Xuefeng,et al.Effect of reciprocating extrusion process on microstructure evolution of Mg-5Sn-1.5Al-1Zn-1Si magnesium alloy[J].The Chinese Journal of Nonferrous Metals,2014,24(12):2978-2983.
[7]郭学锋,杨文朋,宋佩维.往复挤压Mg-Al-Si合金的高温拉伸性能[J].材料热处理学报,2012,33(2):7-11.Guo Xuefeng,Yang Wenpeng,Song Peiwei.Elevated temperature tensile properties of Mg-Al-Si alloys prepared by reciprocating extrusion[J].Transactions of Materials and Heat Treatment,2012,33(2):7-11.
[8]夏显明,谢瑞,薛克敏,等.往复挤压对挤压态ZK60镁合金微观组织和力学性能的影响[J].塑性工程学报,2017,24(3):78-82.Xia Xianming,Xie Rui,Xue Kemin,et al.Effect of cyclic extrusion and compression on microstructure and mechanical properties of extruded ZK60 magnesium alloy[J].Journal of Plasticity Engineering,2017,24(3):78-82.
[9]杨文朋,郭学锋,梁世何.Ce对往复挤压低温正挤压Mg-Zn-Ce合金组织和力学性能的影响[J].中国有色金属学报,2015,25(12):3336-3341.Yang Wenpeng,Guo Xuefeng,Liang Shihe.Effects of Ce on microstructures and mechanical properties of Mg-Zn-Ce alloys processed by reciprocating extrusion and low-temperature forward extrusion[J].The Chinese Journal of Nonferrous Metals,2015,25(12):3336-3341.
[10]Lee S,Chen Y L,Wang H Y,et al.On mechanical properties and superplasticity of Mg-15Al-1Zn alloys processed by reciprocating extrusion[J].Materials Science and Engineering A,2007,464(1/2):76-82.
[11]Wang L P,Chen T,Jiang W Y,et al.Microstructure and mechanical properties of AM60B magnesium alloy prepared by cyclic extrusion compression[J].Transactions of Nonferrous Metals Society of China,2013,23(11):3200-3205.
[12]韩飞,陈刚,刘洪伟,等.铸态ZK60镁合金往复挤压的组织与性能[J].精密成形工艺,2017,9(2):40-44.Han Fei,Chen Gang,Liu Hongeei,et al.Microstructure and properties of cyclic extrusion and compression using as-cast ZK60magnesium alloy[J].Journal of Netshape Forming Engineering,2017,9(2):40-44.
[13]林金保.往复挤压ZK60与GW102K镁合金的组织演变及强韧化机制研究[D].上海:上海交通大学,2009.Lin Jinbao.Microstructure evolution and strengthening mechanism of ZK60 and GW102K alloys fabricated by cyclic extrusion and compression[D].Shanghai:Shanghai Jiao Tong University,2009.