低温下ZL101合金中位错运动对Si相断裂的影响  

Effect of Dislocation Motion on Damaged Si Particle in ZL101 Alloy at Low Temperature

作　　者：马广辉[1] 李润霞[1] 白彦华[1] 李荣德[1] 

机构地区：[1]沈阳工业大学材料科学与工程学院

出　　处：《特种铸造及有色合金》2015年第11期1121-1125,共5页Special Casting & Nonferrous Alloys

基　　金：辽宁省创新团队项目(LT2002004)

摘　　要：研究了ZL101合金在-60℃和20℃时拉伸断裂后组织中Si相的断裂行为。结果表明,ZL101合金在低温下拉伸断裂后组织中断裂Si相的数量增加。合金在塑性变形过程中产生大量位错滑移,位错在Si相边界塞积产生应力集中使Si相断裂。随着温度降低,ZL101合金的切变模量增大,导致局部变形区的位错应力场阻力随位错密度增大而上升的趋势加剧,因此,当局部变形较小时,合金在非局部变形区产生大量的位错并滑移,变形均匀性上升。The fracture behavior of Si particles in Zl101 alloy after tensile testing at-60℃and 20℃ was analyzed.The results show that the number of damaged Si particle is increased in the ZL101 alloy at a lower temperature.There exist lots of dislocations motion during the plastic deformation,which are piled up in ahead of Si particles,leading to the Si particles fracture.Due to the increase of shearing modulus with the decrease of temperature,the resistance of dislocation motion is increased rapidly at the local deformation zone with the dislocation density increase,and the dislocation multiply easily outside the local deformation zone,so the plastic deformation of ZL101 is more homogeneous at low temperature.

关 键 词：AL-SI合金 SI相 位错 塑性变形 低温 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG115.57[金属学及工艺—金属材料]