Microstructure and Properties of (Sr+Y) Composite Rare Earth Modified Semi-solid ADC12 Alloy

LIU Junwei; GAO Peihu; WANG Ya; ANTON Naumov

doi:10.3969/j.issn.1674-6457.2025.11.020

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Journal of Netshape Forming Engineering ›› 2025, Vol. 17 ›› Issue (11) : 208-219. DOI: 10.3969/j.issn.1674-6457.2025.11.020

Light Alloy Forming

Microstructure and Properties of (Sr+Y) Composite Rare Earth Modified Semi-solid ADC12 Alloy

LIU Junwei^1,2, GAO Peihu^2,*, WANG Ya¹, ANTON Naumov^2,3

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Abstract

The work aims to add (Sr+Y) composite rare earth elements to the ADC12 semi-solid aluminum alloy matrix to improve its solidification microstructure morphology and enhance its mechanical and tribological properties. Effects of (Sr+Y) complex rare earth on the microstructure, mechanical and friction and wear properties of semi-solid ADC12 alloy were studied by vertical universal friction and wear testing machine, electronic tension machine, microhardness tester, optical microscope and scanning electron microscope. Before the addition of mixed rare earth, the semi-solid ADC12 alloy microstructure presented a coarse dendrite shape, and the primary α-Al phase was mostly giant elliptic or long strip, but the alloy microstructure was significantly refined after the addition of 0.5wt.%(Sr+Y) composite rare earth, and the primary α-Al phase transition was more rounded, and the distribution became more uniform, and the grain size tended to be consistent. The yield strength, tensile strength and elongation of 0.5wt.%(Sr+Y)/ADC12 alloy were 158.23 MPa, 212.83 MPa and 5.6%, respectively. Compared with semi-solid ADC12 alloy without rare earth (Sr+Y), the yield strength, tensile strength and elongation were increased by 27.24%, 31.56% and 64.71%, respectively. The curve analysis of wear rate and average friction coefficient with load showed that 0.5wt.%(Sr+Y)/ADC12 alloy had the best friction and wear performance, and its wear rate and friction coefficient were lower than those of semi-solid alloys without rare earth under high or low load. With the increase of friction load, the wear rate of the alloy increased and the friction coefficient decreased before and after modification. In conclusion, the addition of (Sr+Y) composite rare earth can significantly refine the microstructure and morphology of ADC12 semi-solid aluminum alloy, and improve the performance of the alloy. When the content of (Sr+Y) composite rare earth is 0.5wt.%, the microstructure refinement of the semi-solid alloy material is the most obvious, and the mechanical and friction wear properties are the best.

Key words

(Sr+Y) composite rare earth / ADC12 alloy / microstructure / mechanical properties / friction and wear performance

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LIU Junwei, GAO Peihu, WANG Ya, ANTON Naumov. Microstructure and Properties of (Sr+Y) Composite Rare Earth Modified Semi-solid ADC12 Alloy[J]. Journal of Netshape Forming Engineering. 2025, 17(11): 208-219 https://doi.org/10.3969/j.issn.1674-6457.2025.11.020

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Funding

National Foreign Expert Program (H20240023); Youth Innovation Team of the Education Department of Shaanxi Province; Xi'an Science and Technology Plan (23LLRHZDZX0019, 23GXFW0036); Key Research and Development Projects in Xianyang City (L2024-ZDYF-ZDYF-GY-0039)