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Fe 含量对 Al-8Si-0.5Mg 合金组织及性能的影响
Effect of Fe Content on Microstructure and Properties of Al-8Si-0.5Mg Alloy
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- DOI:
- 作者:
- 孙 博，刘玉杰，刘春明
SUN Bo, LIU Yujie, LIU Chunming
- 作者单位:
- 东北大学 材料学院，辽宁 沈阳 110819
School of Materials Science & Engineering, Northeastern University, Shenyang 110819, China
- 关键词:
- Al-8Si-0.5Mg 合金；Fe 含量；微观组织；力学性能；导电导热性能
Al-8Si-0.5Mg alloy; Fe content; microstructure; mechanical property; electrical and thermal conductivity
- 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 58 μm；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 58 μm 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.