Mn和Zr对新型Al-Mg-Si-Cu合金组织与性能的影响

Effect of Mn and Zr on Microstructures and Properties of New Type Al-Mg-Si-Cu Alloys

研究了 Mn 和 Zr 对新型 Al-Mg-Si-Cu 合金的显微组织和机械性能的影响,并采用 XRD,EDAX 和 TEM分析了合金中析出相的类型和成分。结果表明:单独添加 Zr,合金的强度降低,塑性提高;复合添加 0.3%Mn和 0.08%Zr,合金-T6 的组织中出现了大量的粒状或条状 AlCrMnFeSi 相,合金的强度和塑性均有所提高;继续增加 Mn 和 Zr 的含量,由于合金中时效强化相——Mg2Si 数量的显著减少和粗大 AlCrMnFeSi 相的增加,造成合金性能下降。

The effect of Mn and Zr on the microstructures and properties of new type Al-Mg-Si-Cu alloys were studied, the type and composition of the precipitates were analyzed by XRD, EDAX and TEM. The results showed that the strength decreased and ductility increased with adding Zr. Adding both 0.03%Mn and 0.08%Zr, granular or rod AlCrMnFeSi dispersoids were present profusely in the microstructures of the alloy-T6, both the strength and ductility of the alloy increased. Continuously increasing Mn and Zr, the properties decreased due to the reduce of precipitate-strengthening phase Mg2Si and the occurrence of coarse AlCrMnFeSi.