Effect of Cr content and cooling rate on the primary phase of Al-2.5Mn alloy

Hang-qi Feng; Zhi-bo Yang; Ye-tong Bai; Li Zhang; Yu-lin Liu

doi:10.1007/s12613-019-1862-1

Volume 26 Issue 12

Dec. 2019

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2019 > 26(12): 1551-1558

Hang-qi Feng, Zhi-bo Yang, Ye-tong Bai, Li Zhang, and Yu-lin Liu, Effect of Cr content and cooling rate on the primary phase of Al-2.5Mn alloy, Int. J. Miner. Metall. Mater., 26(2019), No. 12, pp. 1551-1558. https://doi.org/10.1007/s12613-019-1862-1

Cite this article as:

Hang-qi Feng, Zhi-bo Yang, Ye-tong Bai, Li Zhang, and Yu-lin Liu, Effect of Cr content and cooling rate on the primary phase of Al-2.5Mn alloy, Int. J. Miner. Metall. Mater., 26(2019), No. 12, pp. 1551-1558. https://doi.org/10.1007/s12613-019-1862-1

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Research Article

Effect of Cr content and cooling rate on the primary phase of Al-2.5Mn alloy

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Corresponding author:
Yu-lin Liu E-mail: ylliu@sau.edu.cn
Received: 6 April 2019; Revised: 15 May 2019; Accepted: 20 June 2019

Abstract

Abstract

The effect of Cr content and cooling rate on the microstructure of Al-Mn alloy was studied using well resistance furnace melting, and the alloy was analyzed using scanning electron microscopy (SEM) and X-ray diffraction (XRD). The experimental results showed that adding Cr could significantly improve the morphology of the primary phase in the Al-2.5Mn alloy. Without Cr, the primary phase in the alloy was thick, needle-like, and strip-like structure. After adding 0.2wt%-0.5wt% Cr, the primary phase in the upper part of the alloy was gradually fined and reached the best effect at 0.35wt% Cr. When the content of Cr was 0.5wt%, the microstructure of the primary phase in the upper part began to coarsen. The bottom of the alloy was a large bulk phase, but still much finer than that without adding Cr. XRD and SEM analysis showed that the precipitation phase at the bottom was mainly Al₈₅Mn₇Cr₈, while the fine microstructure at the top was Al₆Mn and Al₃Mn. The results of the cooling rate experiments showed that the primary phase of Al-2.5Mn-0.35Cr was further refined, and the eutectic microstructure was partly achieved, under air-cooling condition. And when the cooling method was iron die-cooling, the microstructure of the Al-2.5Mn-0.35Cr alloy was changed into a eutectic microstructure.
- Al-2.5Mn alloy;
- Cr content;
- primary phase;
- cooling rate

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