铸造缺陷对ZL101合金断裂行为的影响  

Effect of Casting Defects on Tensile Fracture of ZL101 Alloy

作　　者：马广辉 李润霞[2] 段林 MA Guang-hui1, LI Run-xia2, DUAN Lin3(1 .Precision Manufacturing Engineering Department, Suzhou Institute of Industrial Technology, Suzhou 215104, Jiangsu, China; 2.School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, Liaoning, China; 3. Avitools （Suzhou Co., Ltd., Suzhou 215104, Jiangsu, China)

机构地区：[1]苏州工业职业技术学院精密制造工程系,江苏苏州215104 [2]沈阳工业大学材料科学与工程学院,辽宁沈阳110870 [3]昂拓科技(苏州)有限公司,江苏苏州215104

出　　处：《铸造》2018年第2期162-166,共5页Foundry

基　　金：江苏省高级访问工程师计划项目(2017QYSJPX079);江苏高校品牌专业建设工程资助项目(PPZY2015B186);苏州工业职业技术学院科研课题(SGYKJ201709)

摘　　要：通过扫描电子显微镜和光学金相显微镜观察ZL101合金断口及附近组织中的铸造缺陷,使用ANSYS软件分析了加载过程中铸造缺陷附近的应力场分布。结果发现:铸件在拉伸过程中由铸造缺陷附近的共晶组织内产生初始裂纹,裂纹沿着共晶区向外扩展,最终导致合金断裂。铸造缺陷附近形成的应力集中使Al基体发生局部塑性变形,大量位错塞积使Si相断裂。The fracture of Z1101 alloy after tensile test was investigated. The fracture morphology was observed using scanning electron microscope （SEM）, the microstructures of casting defects were observed by optical microscope. The stress field near the casting defect was analyzed by ANSYS. The results show that during tension the micro-cracks appear in the eutectic structure near the casting defects, and the cracks extend along eutectic area until the alloy fractures. AI matrix local plastic deformation occurs in the stress concentration region near the casting defect. A lot of dislocations pile up, which cause Si phase to fracture.

关 键 词：ZL101合金 铸造缺陷 SI相 应力集中 

分 类 号：TG146.2[一般工业技术—材料科学与工程]