Sm对Mg-10Gd-0.5Zr合金组织及力学性能的影响
|
摘要
采用熔炼铸造法制备了添加1%～5%Sm(质量分数)的Mg-10Gd-0.5Zr合金,通过拉伸性能测试、扫描电镜、X射线衍射分析研究了Sm对合金显微组织和力学性能的影响。结果表明:Sm的加入形成了Mg41Sm5相,并促进了Mg_5Gd相析出。固溶时效处理后,晶界处粗大共晶组织溶解,析出相弥散分布,3%Sm的合金晶粒较细小,5%Sm的合金中出现短棒状Mg_5Gd相。在相同实验温度下,随着Sm含量的增加,合金的强度先升高后降低,3%Sm的合金抗拉强度最大。对于同一种合金,随着拉伸温度的升高抗拉强度先升高后降低,加入0%～1%Sm的合金抗拉强度峰值出现在200℃,加入3%～5%Sm的合金抗拉强度峰值出现在250℃。抗拉强度具有明显的反常温度效应,而且Sm的加入强化了这种反常温度效应并使强度峰值出现的温度升高。
Mg-10 Gd-0.5 Zr alloys with 1 wt%～5 wt% Sm addition were prepared by a melting and casting method. The effect of Sm onmicrostructures and mechanical properties were investigated by tensile tests, SEM and XRD. The results show that the Mg_(41)Sm_5 phase isfound because of Sm addition, and Sm promotes the precipitation of Mg_5Gd. After solution-aging treatment, the coarsening eutecticstructures at grain boundary are dissolved and the precipitation disperses homogeneously. The finer grain size is observed when thecontent of Sm comes to 3 wt%. Some of Mg_5Gd phase become short rod-like when Sm addition is 5 wt%. At the same experimentaltemperature, the strength of tested alloys increases at first and then decreases, and the peak strength appears when the content of Sm is 3 wt%. For the same alloy, with increasing of test temperature, the strength increases at first and then decreases too. When the Sm contentis 0～1 wt%, the temperature of tensile strength peak is 200 oC while when Sm content is 3 wt%～5 wt% the temperature is 250 oC. There isan abnormal temperature effect in tensile tests; the Sm addition reinforces the effect and increases the temperature of tensile strength peak.
Mg-10 Gd-0.5 Zr alloys with 1 wt%～5 wt% Sm addition were prepared by a melting and casting method. The effect of Sm onmicrostructures and mechanical properties were investigated by tensile tests, SEM and XRD. The results show that the Mg_(41)Sm_5 phase isfound because of Sm addition, and Sm promotes the precipitation of Mg_5Gd. After solution-aging treatment, the coarsening eutecticstructures at grain boundary are dissolved and the precipitation disperses homogeneously. The finer grain size is observed when thecontent of Sm comes to 3 wt%. Some of Mg_5Gd phase become short rod-like when Sm addition is 5 wt%. At the same experimentaltemperature, the strength of tested alloys increases at first and then decreases, and the peak strength appears when the content of Sm is 3 wt%. For the same alloy, with increasing of test temperature, the strength increases at first and then decreases too. When the Sm contentis 0～1 wt%, the temperature of tensile strength peak is 200 oC while when Sm content is 3 wt%～5 wt% the temperature is 250 oC. There isan abnormal temperature effect in tensile tests; the Sm addition reinforces the effect and increases the temperature of tensile strength peak.
引文
[1]Ding Wenjiang(丁文江),Wu Yujuan(吴玉娟),Peng Liming(彭立明)et al.Materials China(中国材料进展)[J],2010,29(8):37
[2]Wu guohua(吴国华),Chen Yushi(陈玉狮),Ding Wenjiang(丁文江).Manned Spaceflight(载人航天)[J],2016,22(3):281
[3]Jiang Yanbin,Guan Lei,Tang Guoyi et al.International Journal of Minerals,Metallurgy and Materials[J],2015,22(4):411
[4]Tork N B,Razavi S H,Saghafian H et al.Advanced Engineering Materials[J],2016,18(1):156
[5]Li R G,Xin R L,Liu Q et al.Materials Characterization[J],2015,109:43
[6]Srinivasan A,Dieringa H,Mendis C L et al.Materials Science and Engineering A[J],2016,649:158
[7]Dong Lijun(董丽君),Xia Chang(夏长清),Zhou Yan(周岩).Foundry(铸造)[J],2014,63(11):1149
[8]Fu Sanling(付三玲),Li Quanan(李全安),Jing Xiaotian(井晓天)et al.Foundry(铸造)[J],2014,63(1):53
[9]Zhang Zhenyan,Peng Liming,Zeng Xiaoqin et al.Materials Characterization[J],2009,60(6):555
[10]Rokhlin L L,Dobatkina T V,Nikitina N I.Materials Science Forum[J],2003,419:291
[11]Shi X Y,Luo A A,Sutton S C et al.Journal of Alloys and Compounds[J],2015,650:622
[12]Xiao Hongchao,Tang Bei,Liu Chuming et al.Materials Science and Engineering A[J],2015,645:241
[13]Alizadeh R,Mahmudi R,Ngan A H W et al.Journal of Materials Science[J],2015,50(14):4940
[14]Liu Ningyuan,Zhang Zhenyan,Peng Liming et al.Materials Science and Engineering A[J],2015,627:223
[15]Zhang Qi(张奇),Sun Liangcheng(孙良成),Lu Fei(鲁飞)et al.Materials Review(材料导报)[J],2015,29(5):105
[16]Rokhlin L L,Nitikina N I,Dobatkina T V.Journal of Alloys and Compounds[J],1996,239:209
[17]Li Quanan(李全安),Li Kejie(李克杰),Zhang Qing(张清).Transactions of Materials and Heat Treatment(材料热处理学报)[J],2011,32(12):84
[18]Fu Sanling(付三玲).These for Doctorate(博士学位论文)[D].Xi’an:Xi’an University of Technology,2016:69
[2]Wu guohua(吴国华),Chen Yushi(陈玉狮),Ding Wenjiang(丁文江).Manned Spaceflight(载人航天)[J],2016,22(3):281
[3]Jiang Yanbin,Guan Lei,Tang Guoyi et al.International Journal of Minerals,Metallurgy and Materials[J],2015,22(4):411
[4]Tork N B,Razavi S H,Saghafian H et al.Advanced Engineering Materials[J],2016,18(1):156
[5]Li R G,Xin R L,Liu Q et al.Materials Characterization[J],2015,109:43
[6]Srinivasan A,Dieringa H,Mendis C L et al.Materials Science and Engineering A[J],2016,649:158
[7]Dong Lijun(董丽君),Xia Chang(夏长清),Zhou Yan(周岩).Foundry(铸造)[J],2014,63(11):1149
[8]Fu Sanling(付三玲),Li Quanan(李全安),Jing Xiaotian(井晓天)et al.Foundry(铸造)[J],2014,63(1):53
[9]Zhang Zhenyan,Peng Liming,Zeng Xiaoqin et al.Materials Characterization[J],2009,60(6):555
[10]Rokhlin L L,Dobatkina T V,Nikitina N I.Materials Science Forum[J],2003,419:291
[11]Shi X Y,Luo A A,Sutton S C et al.Journal of Alloys and Compounds[J],2015,650:622
[12]Xiao Hongchao,Tang Bei,Liu Chuming et al.Materials Science and Engineering A[J],2015,645:241
[13]Alizadeh R,Mahmudi R,Ngan A H W et al.Journal of Materials Science[J],2015,50(14):4940
[14]Liu Ningyuan,Zhang Zhenyan,Peng Liming et al.Materials Science and Engineering A[J],2015,627:223
[15]Zhang Qi(张奇),Sun Liangcheng(孙良成),Lu Fei(鲁飞)et al.Materials Review(材料导报)[J],2015,29(5):105
[16]Rokhlin L L,Nitikina N I,Dobatkina T V.Journal of Alloys and Compounds[J],1996,239:209
[17]Li Quanan(李全安),Li Kejie(李克杰),Zhang Qing(张清).Transactions of Materials and Heat Treatment(材料热处理学报)[J],2011,32(12):84
[18]Fu Sanling(付三玲).These for Doctorate(博士学位论文)[D].Xi’an:Xi’an University of Technology,2016:69