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Al-Si-Cu 三元共晶合金组织及性能影响因素研究
Influencing Factors on Microstructure and Mechanical Properties of Al-Si-Cu Ternary Eutectic Alloy
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- DOI:
- 作者:
- 赵娟，李辰，仲莹莹，朱琳
ZHAO Juan, LI Chen, ZHONG Yingying, ZHU Lin
- 作者单位:
- 航天科工防御技术研究试验中心，北京 100854
Aerospace Science and Industry Defense Technology Research Testing Center, Beijing 100854, China
- 关键词:
- Al-Si-Cu 三元共晶； 微量合金元素； 变质； 热处理
Al-Si-Cu alloy; microalloying element; modification; heat treatment
- 摘要:
- 采用扫描电镜、能谱分析及力学性能表征，研究了微量合金元素、Si 的变质工艺、热处理工艺对 Al-Si-Cu 三
元共晶合金组织和力学性能的影响。 结果表明，微量合金元素 Ni 含量在 0.1%以下时，合金中的 θ 相为连续分布，而添
加量为 0.25%试样中 θ 相明显从连续分布变为断续分布；在 Si 经变质处理后，合金中的 Si 变为蠕球状，仍然存在的枝
晶状、片状和初生 Si 的边缘部分也变得圆滑；固溶处理可进一步减少 θ 相对材料塑性的影响；当合金经过 θ 相的分布
调整、Si 变质、固溶、400 ℃高温等处理后，伸长率提高 8.5%以上。
The effects of microalloying elements, modification process of Si and heat treatment process on the microstructure and mechanical properties of Al-Si-Cu ternary eutectic alloy were studied by SEM, EDS and mechanical properties characterization. The results show that the θ phase distribution in the alloy is continuous when the Ni content is less than 0.1%, while the θ phase distribution in the alloy with the Ni content of 0.25% is obviously discontinuous. After modification, the Si in the alloy becomes vermicular, and the edges of the existing dendritic, flaky and primary Si also become smooth. The effect of θ on material plasticity can be further reduced by solution treatment. After θ phase distribution adjustment, Si modification, solid solution and 400 ℃ high temperature treatment, the elongation of the alloy increases by more than 8.5%.