Study on microstructure and refining effect of deformed Al-4.5Er-1Zr-1.5Ti master alloy

Zhiguo Lei, Shengping Wen, Guang Yang, Wu Wei, Hui Huang, Zuoren Nie
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Abstract

The microstructure and grain refinement of Al-4.5Er-1Zr-1.5Ti master alloy were analyzed by the refinement experiment, OM, SEM and XRD. The results show that the grain size of pure aluminum is reduced from 14,000μm to 202μm by Al-4.5Er-1Zr-1.5Ti master alloy, which is mainly due to the nucleation promoted by Ti2Al20Er, Al3Er and Al3Ti. Plastic deformation further improves the refining effect of the material by improving the primary phase size, and the Al-4.5Er-1Zr-1.5Ti −2ARB can refine the pure aluminum from 202 mμm to 150μm, and the refinement was increased by 25.7 %. The master alloy showed a better refinement effect in Al-5Cu alloy than pure aluminum, with a grain size of 92μm and a refinement improvement of 97.8 %.

变形 Al-4.5Er-1Zr-1.5Ti 母合金的显微组织和细化效果研究
通过细化实验、OM、SEM 和 XRD 分析了 Al-4.5Er-1Zr-1.5Ti 母合金的显微组织和晶粒细化情况。结果表明,Al-4.5Er-1Zr-1.5Ti 母合金使纯铝的晶粒尺寸从 14,000μm 减小到 202μm,这主要是由于 Ti2Al20Er、Al3Er 和 Al3Ti 促进了晶核的形成。塑性变形通过改善原生相尺寸进一步提高了材料的细化效果,Al-4.5Er-1Zr-1.5Ti -2ARB可将纯铝从202微米细化至150微米,细化度提高了25.7%。母合金在 Al-5Cu 合金中的细化效果优于纯铝,其晶粒尺寸为 92μm,细化度提高了 97.8%。
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