MICROSTRUCTURES AND ROOM TEMPERATURE MECHANICAL PROPERTIES OF Al–6.3Zn–2.8Mg–1.8Cu CASTING ALUMINUM ALLOY
YANG Guangyu, MENG Hongshuai, LIU Shaojun, QI Yuanhao, JIE Wanqi
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072
Cite this article:
YANG Guangyu MENG Hongshuai LIU Shaojun QI Yuanhao JIE Wanqi. MICROSTRUCTURES AND ROOM TEMPERATURE MECHANICAL PROPERTIES OF Al–6.3Zn–2.8Mg–1.8Cu CASTING ALUMINUM ALLOY. Acta Metall Sin, 2012, 48(2): 211-219.
Abstract The microstructures and room temperature mechanical properties of metal–mold– casting aluminum alloy Al–6.3Zn–2.8Mg–1.8Cu were studied. It was found that the microstructure of the as–cast experimental alloy consists of near equiaxed α(Al) matrix, α(Al)+η(MgZn2) eutectic and little Al7Cu2Fe particle phase. The phase constitution of the quenched experimental alloy was changed, the η phase was dissolved into α(Al) matrix and tended to disappear, however a new phase, S(Al2CuMg), appeared, which still mainly distributed along the α(Al) grain boundary. The optimum single–aging process parameters were determined by investigating age hardening response of the experimental alloy. It was found that the double–aging process could make the tensile strength of the experimental alloy increase from 480 MPa to 490 MPa, and the elongation from 0.2% to 2.2%,comparing with the single–aging process.
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