稀土Y对再生6061铝合金微观组织和性能的影响

doi:10.19976/j.cnki.43-1448/TF.2023041

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Abstract The promotion of recycled aluminium alloys can reduce energy consumption and carbon pollution, but the excess of Fe impurities is not conducive to efficient recycling of the alloy. In this paper, recycled 6061 aluminium alloys with different Y contents (0, 0.15%, 0.30% and 0.60% by mass fraction) were prepared by melting and casting. The microstructure and phase composition of the alloys were analysed by metallographic microscopy (OM), scanning electron microscopy (SEM) and X-ray diffraction (XRD), and the tensile and corrosion resistance were tested. The results show that ternary Al₂Si₂Y phases are formed in Y-containing alumium alloys, with significant refinement of the α-Al dendrites and α-Al₁₅(Fe,Mn)₃Si₂(α-Fe) phases, with the best refinement achieve in alloys with a w(Y) of 0.30%. Y addition can significantly enhance the mechanical properties of the alloy, with the highest tensile strength (199.2 MPa) for a w(Y) of 0.30% and the highest elongation (14.5%) for a w(Y) of 0.60%. In addition, Y addition can also increase the corrosion potential of the 6061 alumium alloy and reduce the corrosion current density, improve the corrosion resistance property of the alloy. In the intergranular corrosion experiments, the alloy with a w(Y) of 0.60% possesses the smallest corrosion depth for the same time. Overall, the recycled alumium alloy with a w(Y) of 0.60% exhibits both good mechanical and corrosion resistance properties, achieving effective recycling of high iron content 6061 aluminium alloys.

Key words： Y element recycled aluminum alloy refinement mechanical property corrosion resistance property

Received: 04 April 2023 Published: 21 September 2023

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TG146.2⁺1

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	QUAN Xiang
	WEI Qirong
	LI Jiabin
	WANG Bin

Cite this article:

QUAN Xiang,WEI Qirong,LI Jiabin, et al. Effects of rare earth Y on the microstructure and properties of recycled 6061 aluminium alloy[J]. Materials Science and Engineering of Powder Metallurgy, 2023, 28(4): 368-378.

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http://pmbjb.csu.edu.cn/EN/10.19976/j.cnki.43-1448/TF.2023041 OR http://pmbjb.csu.edu.cn/EN/Y2023/V28/I4/368

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