CO_(2)对铸造镁铝合金微观组织和力学性能影响  

Effect of Carbon Dioxide on Microstructure and Mechanical Properties of Cast Magnesium-Aluminum Alloy

作　　者：王立刚 王岭 李冰 左修源 刘莹 赵美 刘杨 甄凤鸣 WANG Li-gang;WANG Ling;LI Bing;ZUO Xiu-yuan;LIU Ying;ZHAO Mei;LIU Yang;ZHEN Feng-ming(Liaoning Provincial Engineering Research Center for High-Value Utilization of Magnesite,Yingkou Institute of Technology,Yingkou 115014,Liaoning,China)

机构地区：[1]营口理工学院,辽宁省菱镁矿高值利用工程研究中心,辽宁营口115014

出　　处：《铸造》2025年第1期75-81,共7页Foundry

基　　金：营口理工学院高层次人才科研启动项目(YJRC202115、YJRC202009);辽宁省菱镁矿高值利用工程研究中心课题(LMNY2024020203、LMNY2024020205);辽宁省科技联合基金(2020-YKLH-26、2021-YKLH-19);辽宁省教育厅基本科研项目(JYTMS20230065);营口英才计划、大学生创新创业训练计划(S202314435014、X202414435066、X202414435067、X202414435065)。

摘　　要：研究了添加CO_(2)对铸态Mg-1Al合金微观组织和力学性能的影响。在Mg-1Al合金中添加CO_(2)后,平均晶粒尺寸从120μm显著减小至80μm。添加CO_(2)的晶粒细化效应归因于两个原因:一是CO_(2)与Mg和Al反应,生成的MgO和Al4C3与镁基体的晶格匹配度高,是良好的异质形核质点,可起到晶粒细化作用;二是CO_(2)的搅拌效应促使MgO和Al4C3均匀分布,进一步提升晶粒细化效果。晶粒细化后,室温压缩屈服强度和抗压强度分别从210 MPa和333 MPa提高至225 MPa和345 MPa。晶粒细化在室温至350℃温度范围内均可起到的强化效果。在室温至350℃压缩时,Mg-1Al的主要变形机制是位错滑移和孪晶,而Mg-1Al-3CO_(2)的主要变形机制是位错滑移。The effects of CO_(2) addition on grain refinement and mechanical properties of as-cast Mg-1Al alloy were investigated.The addition of CO_(2) to Mg-1Al alloy could significantly reduce the average grain size from 120μm to 80μm.The grain refining effect of CO_(2) addition was attributed to two reasons:(1)the formation of heterogeneous nuclei of MgO and Al_(4)C_(3) after adding CO_(2) into Mg-1 Al alloy melt;(2)uniformly distribution of MgO and Al4C3 induced by CO_(2) bubbles stirring effect.The yield stress and compressive stress of Mg-1Al-3CO_(2) were improved from 210 MPa and 333 MPa to 225 MPa and 345 MPa at ambient temperature.The stress strengthening effects accompanied with grain refinement were also observed in compression experiment at elevated temperature from room temperature(RT)to 350℃.It was found that the main deformation mechanisms of Mg-1Al were dislocation slip and twinning below 350℃,while for Mg-1Al-3CO_(2),the main deformation mechanism was dislocation slip.

关 键 词：铸态 镁铝合金 晶粒细化 压缩试验 

分 类 号：TG146.2[一般工业技术—材料科学与工程] TG113[金属学及工艺—金属材料]