Effect of Minor Sc Addition on the Microstructure Evolution of Al–Cu–Li–Mg Alloy During Homogenization with Different Cooling Modes

Ya Tang; Daihong Xiao; Lanping Huang; Renxuan You; Xinyue Zhao; Nan Lin; Yunzhu Ma; Wensheng Liu

doi:10.1007/s12540-021-01146-9

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자료유형: 학술저널

저자정보: Ya Tang (Central South University) Daihong Xiao (Central South University) Lanping Huang (Central South University) Renxuan You (Central South University) Xinyue Zhao (Central South University) Nan Lin (Central South University) Yunzhu Ma (Central South University) Wensheng Liu (Central South University)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.28 No.10

발행연도: 2022.10

수록면: 2,422 - 2,433 (12page)

DOI: 10.1007/s12540-021-01146-9

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The microstructure evolution and mechanical properties of Al–3.92Cu–1.10Li–0.68Mg–0.32Ag–0.23Mn–0.35Zn–0.11Zrand Al–3.92Cu–1.12Li–0.76Mg–0.29Ag–0.24Mn–0.24Zn–0.12Zr–0.083Sc (wt%) alloys during homogenization with differentcooling modes were comprehensively studied. It was clearly revealed that the minor Sc addition refined the grainsof as-cast Al–Cu–Li–Mg alloys through the formation of primary Al3(Sc, Zr) phases during the solidification process, andinduced Sc enrichment in the θ (Al2Cu) eutectic. After the homogenization treatment, the majority of coarse nonequilibriumeutectic phases at the grain boundaries dissolved into the α-Al matrix, leading to the relatively uniform distribution ofeach element. Sc-added alloy after homogenization treatments possessed more superior strength and ductility than Sc-freealloy. Compared to the furnace cooling mode, the air cooling mode could inhibit the precipitation of micron-sized coarse T1(Al2CuLi) phase and improve the mechanical properties of the alloys. After homogenization, the continuous Al2Cuphase inthe as-cast Sc-added alloy dissolved and transformed to an array of W-(Al, Cu, Sc) ternary phase, which was identified asAl6Cu6Scwith the body-centered tetragonal structure. The appearance of spherical Al6Cu6Scparticle could not damage themechanical properties of Al–Cu–Li–Mg alloys after the homogenization treatment. The tensile strength, yield strength andelongation of Sc-added alloy after the homogenization by air cooling were 390 MPa, 265 MPa and 10.8%, respectively. Theinvestigation of Al6Cu6Scphase offered a potential avenue to produce high-quality Sc-added 2xxx series alloys.

#Scandium addition · Al–Li alloy · Homogenization · Microstructure · Al6Cu6Sc

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