HARDENING BEHAVIOR OF THE AS–CAST Al–Mg–Sc–Zr ALLOY

doi:10.3724/SP.J.1037.2010.00645

Acta Metall Sin

2011, Vol. 47

Issue (3): 311-316 DOI: 10.3724/SP.J.1037.2010.00645

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HARDENING BEHAVIOR OF THE AS–CAST Al–Mg–Sc–Zr ALLOY

DU Gang, YANG Wen, YAN Desheng, RONG Lijian

Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016

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DU Gang YANG Wen YAN Desheng RONG Lijian. HARDENING BEHAVIOR OF THE AS–CAST Al–Mg–Sc–Zr ALLOY. Acta Metall Sin, 2011, 47(3): 311-316.

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Abstract Addition of minor Sc and Zr to the Al–Mg alloys can effectively improve the recrystallization temperature and strength of the alloys due to the formation of L12 structured Al₃(Sc, Zr) precipitates. To optimize the mechanical properties of the Al–Mg–Sc–Zr alloys, it is important to understand the precipitation behavior of the Al₃(Sc, Zr) precipitates and the corresponding strengthening effect during the annealing of Al–Mg–Sc–Zr alloys. In this work, isothermal annealing at the temperatures between 250 and 450 ℃ was conducted to study the precipitation behavior of Al₃(Sc, Zr) particles in the as–cast Al–6Mg–0.2Sc–0.15Zr alloy (mass fraction, %). The results show that dramatic precipitation hardening occurred with the formation of the coherent Al₃(Sc, Zr) precipitates during the annealing. Precipitation rocess of the Al₃(Sc, Zr) accelerates with the increase of the annealing temperature. After the sample was annealed at 300 ℃ for 24 h, the Al₃(Sc, Zr) particles were in a size of 5 nm ad the yield strength of the as–cast alloy can be increased by 90 MPa. Severe coarsening of Al₃(Sc, Zr) occurred when the annealing temperature is bove 400 ℃. After annealed at 450 ℃ for 24 h, average particle size of Al₃(Sc, Zr) particles was found increase to 30 nm, wth the corresponding precipitation strengthening effect to be about 30 MPa.

Key words: Al-Mg-Sc-Zr alloy annealing precipitation strengthening microstructure

Received: 01 December 2010

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2010.00645 OR https://www.ams.org.cn/EN/Y2011/V47/I3/311

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