Ca对Mg-5Al合金热裂敏感性的影响  

Effect of Ca on the Hot Tearing Susceptibility of Mg-5Al Alloys

作　　者：张光[1,2] 邱克强[1] 孙治国[1] 任英磊[1] ZHANG Guang QIU Ke-qiang SUN Zhi-guo REN Ying-lei(School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, Liaoning, China College of Materials Science and Engineering, Liaoning Technical University, Fuxin 123000, Liaoning, China)

机构地区：[1]沈阳工业大学材料科学与工程学院,辽宁沈阳110870 [2]辽宁工程技术大学材料科学与工程学院,辽宁阜新123000

出　　处：《铸造》2017年第2期186-191,共6页Foundry

基　　金：沈阳市科技计划项目(F14-197-4-00)

摘　　要：采用等长热裂试棒法评价Ca对Mg-5Al合金热裂敏感性的影响,通过光学显微镜、扫描电镜、X射线衍射仪、拉伸实验机和Image-J软件分析合金的热裂机制。结果表明:Ca含量2.5%时,合金热裂敏感性最低;共晶组织对合金热裂敏感性影响明显,单一、充足的共晶组织有利于对初生热裂纹补缩,降低合金热裂敏感性;在凝固末期,若合金力学性能不佳,在树枝晶搭桥区会产生不可补缩热裂纹。Adopt isometric cracking rod method to evaluate hot tearing susceptibility of Mg-5Al-xCa. Use OM, SEM, EDS, XRD, tensile testing machine and Image-J software to analyze hot tearing formation mechanism of the alloys. The consequences as follows： when Ca content is 2.5%, hot tearing susceptibility of the alloy is minimum; eutectic structure significantly impacts on hot tearing susceptibility of the alloy, so single and sufficient eutectic structure which can feed primary hot tearing reduces hot tearing susceptibility of the alloy; at the end of solidification, if tensile strength of the alloy is poor, hot tearing of the alloy will occur in bridged-grain area.

关 键 词：Mg-5Al合金 CA 等长热裂试棒 热裂敏感性 共晶组织 

分 类 号：TG146.22[一般工业技术—材料科学与工程]