MICROSTRUCTURES AND ROOM TEMPERATURE MECHANICAL PROPERTIES OF Al–6.3Zn–2.8Mg–1.8Cu CASTING ALUMINUM ALLOY

doi:10.3724/SP.J.1037.2011.00579

Acta Metall Sin

2012, Vol. 48

Issue (2): 211-219 DOI: 10.3724/SP.J.1037.2011.00579

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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

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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.

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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.

Key words: aluminum alloy solution treatment microstructure age hardening mechanical property

Received: 15 September 2011

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Supported by National Natural Science Foundation of China (No.51071129) and National Basic Research Program of China (No.2011CB610400)

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2011.00579 OR https://www.ams.org.cn/EN/Y2012/V48/I2/211

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