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T6 Treatment and Its Effects on Corrosion Properties of an Mg–4Sn–4Zn–2Al Alloy

1
College of Materials Science and Engineering, Sichuan University, Chengdu 610065, China
2
Institute of Applied Physics and Computational Mathematics, Beijing 100094, China
3
CAEP Software Center for High Performance Numerical Simulation, Beijing 100088, China
*
Author to whom correspondence should be addressed.
Materials 2018, 11(4), 628; https://doi.org/10.3390/ma11040628
Received: 18 March 2018 / Revised: 11 April 2018 / Accepted: 17 April 2018 / Published: 19 April 2018
(This article belongs to the Section Structure Analysis and Characterization)
The effects of T6 treatment (solid-solution and artificially aging at 200 °C) on the microstructure and corrosion properties of an Mg–4Sn–4Zn–2Al (TZA442) alloy were systematically investigated. The alloy exhibits a double-peak age-hardening behavior, i.e., one is 78 HV after 10 h of aging, and the other is 83 HV after 50 h of aging. The strengthening effect is mainly attributed to the simultaneously and mutually independent precipitation of the dispersively distributed MgZn2 and Mg2Sn precipitates. Solid-solution treatment can significantly decrease the corrosion rate of the TZA442 alloy. The following aging treatment can initially further decrease the corrosion rate in the under-aged state, but can afterward slightly increase it after 50 h of aging. The relationship between the microstructure and corrosion properties is also discussed. View Full-Text
Keywords: magnesium; precipitation hardening; alloying; corrosion rate magnesium; precipitation hardening; alloying; corrosion rate
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Huang, X.; Han, G.; Huang, W. T6 Treatment and Its Effects on Corrosion Properties of an Mg–4Sn–4Zn–2Al Alloy. Materials 2018, 11, 628.

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