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Title: The development of low-temperature heat-treatable high pressure die-cast Al-Mg-Fe-Mn alloys with Zn levels
Authors: Zhu, X
Liu, F
Wang, S
Ji, S
Keywords: Al-Mg alloy;microstructure;mechanical properties;heat treatment;η' precipitate;high pressure die casting
Issue Date: 18-Mar-2021
Publisher: Springer Nature
Citation: Zhu, X., Liu, F., Wang, S. and Ji, S. (2021) 'The development of low-temperature heat-treatable high pressure die-cast Al-Mg-Fe-Mn alloys with Zn levels', Journal of Materials Science, 56, pp. 11083–11097. doi: 10.1007/s10853-021-05972-5.
Abstract: © The Author(s) 2021. In the present work, a novel low-temperature heat-treatable recycled die-cast Al–Mg alloy was developed by adding Zn into non-heat-treatable Al–5Mg– 1.5Fe–0.5Mn alloy. The results showed that Zn additions resulted in the for- mation of equilibrium phase T-Mg32(Al, Zn)49 under as-cast condition, which can be dissolved into the a-Al matrix at a relatively low solution temperature (430 °C) and thus set the base for the low-temperature heat treatment. The mechanical test results indicated that Zn additions had a smooth liner improvement in the strength of all as-cast alloys and T6-state alloys with 1% and 2% Zn as its concentration increased but resulted in a sharp improvement on the strength of T6-state alloy when Zn concentration increased from 2 to 3%. TEM analysis revealed that the precipitate in T6-state Al–5Mg–1.5Fe–0.5Mn–3Zn alloy is g0 phase, rather than the widely reported T00 or T0 phase in other Al–Mg– Zn alloys with approximately same Mg and Zn concentrations. After the opti- mized low-temperature T6 heat treatment (solution at 430 °C for 60 min and ageing at 120 °C for 16 h), the Al–5Mg–1.5Fe–0.5Mn–3Zn alloy exhibits the yield strength of 321 MPa, ultimate tensile strength of 445 MPa and elongation of 6.2%.
ISSN: 0022-2461
Appears in Collections:Brunel Centre for Advanced Solidification Technology (BCAST)
Dept of Mechanical and Aerospace Engineering Research Papers

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