退火工艺对SLM AlSi10Mg合金拉伸变形行为的影响  

Effect of annealing process on tensile deformation behavior of the SLM AlSi10Mg alloy

作　　者：刘怡然 李磊[1] Liu Yiran;Li Lei(College of Science,Inner Mongolia University of Technology,Hohhot Inner Mongolia 010051,China)

机构地区：[1]内蒙古工业大学理学院,内蒙古呼和浩特010051

出　　处：《金属热处理》2024年第6期23-28,共6页Heat Treatment of Metals

基　　金：内蒙古自然科学基金(2023MS01007);内蒙古工业大学博士基金(BS2021053);内蒙古工业大学大学生创新创业训练计划(2023094001)。

摘　　要：借助扫描电镜、光学显微镜、拉伸试验机等手段,研究了退火温度和退火时间对选区激光熔化(SLM)AlSi10Mg合金拉伸变形行为的影响,分析了不同退火工艺下各区域应变的演化过程。结果表明,随着退火温度的升高和退火时间的延长,SLM AlSi10Mg合金共晶Si尺寸增大,试样的搭接纹路逐渐消失,共晶组织逐渐均匀并球化;合金的塑性变形明显,大变形区域范围扩大,局部大变形区域发生颈缩;合金的抗拉强度降低,伸长率增大,显微硬度降低。经500℃×1 h退火后,合金伸长率由6.7%增大到15.1%,同时抗拉强度由252 MPa降低至150 MPa,具有较好的强塑性。With the aid of scanning electron microscope,optical microscope,tensile testing machine,effects of annealing temperature and annealing time on selective laser melted(SLM)AlSi10Mg alloy tensile deformation behavior were studied,and the regional strain under different annealing were analyzed.The results show that with the increase of annealing temperature and annealing time,the phase size of eutectic Si in the SLM AlSi10Mg alloy increases,the lap grain of the specimen gradually disappears,and the eutectic structure gradually becomes uniform and spheroidized.The plastic deformation of the alloy specimen is obvious,the large deformation area is enlarged,and the local large deformation area is necked.The tensile strength of the alloy decreases,the elongation increases and the microhardness decreases.After annealing at 500℃for 1 h,the elongation of the alloy increases from 6.7%to 15.1%,and the tensile strength decreases from 252 MPa to 150 MPa.The alloy has good strength and plasticity.

关 键 词：AlSi10Mg合金 选区激光熔化(SLM) 退火 微观组织 力学性能 

分 类 号：TG146[一般工业技术—材料科学与工程]