摘要
利用光镜、扫描电镜观察及硬度、拉伸、导电和导热性能测试等研究了Fe对Al-8Si-0.5Mg合金组织及性能的影响。结果表明,随着Fe的增加,铸态组织中第二相比例逐渐增加,二次枝晶间距逐渐减小,针状富Fe相平均长度先升高后降低,0.9%Fe时达到最大值58μm;同时,合金的硬度逐渐升高,电导率和热导率均呈逐渐降低的趋势,屈服强度逐渐升高。当1.15%Fe时,硬度达到最大值90 HV;电导率和热导率分别下降了约14%和11%;屈服强度升高了约13.7%。随着Fe的增加,伸长率呈下降趋势,当0.9%Fe时下降了48%,而后随着Fe含量增加基本保持不变。
The effect of Fe on microstructure and performance of Al-8Si-0.5Mg alloy was studied by optical microscope(OM),scanning electron microscope(SEM)and hardness,tensile,electrical and thermal conductivity tests.The results show that with the increase of Fe content,the proportion of the second phase in the as-cast microstructure increases gradually,the secondary dendrite spacing decreases gradually,and the average length of the needle-like Fe-rich phase increases first and then decreases,and reaching the maximum 58μm at 0.9%Fe.At the same time,the hardness of the alloy gradually increase,the electrical conductivity and thermal conductivity show a trend of gradual decrease,and the yield strength gradually increase.When 1.15%Fe,the hardness reaches the maximum 90 HV.The conductivity and thermal conductivity decrease by about 14%and 11%respectively.The yield strength increase by about 13.7%.With the increase content of Fe,the elongation will decrease by 48%when the Fe content is 0.9%Fe,and then it remains unchanged with the increase of Fe content.
作者
孙博
刘玉杰
刘春明
SUN Bo;LIU Yujie;LIU Chunming(School of Materials Science&Engineering,Northeastern University,Shenyang 110819,China)
出处
《铸造技术》
CAS
2022年第2期83-89,共7页
Foundry Technology
基金
国家重点研发计划资助项目(2018YFB2001801)。
