Sc含量对Al-Si铸造合金组织与力学性能的影响  

Effect of Sc Content on Microstructure and Mechanical Properties of Al-Si Casting Alloy

作　　者：何兵 覃铭 梁柳青 覃乃领 

机构地区：[1]百色学院材料科学与工程学院,广西百色533000

出　　处：《铸造技术》2017年第10期2360-2364,共5页Foundry Technology

基　　金：广西科学研究与技术开发计划课题(科技攻关项目)资助项目(2014AA01018);广西高校科学技术研究重点项目资助(ZD2014134)

摘　　要：制备了不同Sc含量的Al-Si系A356铸造铝合金,通过金相显微分析、SEM和拉伸性能测试,研究了Sc含量对Al-Si系铸造合金组织与性能的影响。结果表明,随着Sc的适量增加,合金中α-Al基体得到细化效果增强,大部分共晶硅形态由针片状向颗粒状转变,合金的抗拉强度、塑性、硬度值同步提升。当稀土Sc添加量为0.2%时,对合金组织细化效果最佳,合金抗拉强度、伸长率和硬度等力学性能分别提高了24.7%、47.6%和8.7%。当Sc含量超过0.3%后,作用的效果减弱。The casting A356 aluminum alloy of Al-Si series with different Sc content were prepared. The influence of Sc content on the microstructure and properties of Al-Si casting alloy had been investigated by means of metallographic microscope, SEM and tensile testing. The results show that the α-Al matrix in the alloy could be enhanced with the increase of the amount Sc within a certain range. The morphology of most eutectic silicon change from needle-like to granular, and the tensile strength, plasticity and hardness of the alloy increase simultaneously. The refining effect for the alloy microstructure is the best when the amount of rare earth Sc is 0.2%, and the mechanical properties of tensile strength, elongation and hardness of the alloy improve with 24.7%, 47.6% and 8.7%, respectively. However, the effect is weakened when the content of Sc exceeds 0.3%.

关 键 词：稀土 铸造 A356铝合金 细化 变质 

分 类 号：TG146.21[一般工业技术—材料科学与工程]