1. Effect of ageing treatment on the precipitation behaviour of Mg–Gd–Y–Zn–Zr alloy
- Author
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Xu, C., Zheng, M.Y., Wu, K., Wang, E.D., Fan, G.H., Xu, S.W., Kamado, S., Liu, X.D., Wang, G.J., and Lv, X.Y.
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MAGNESIUM alloys , *GADOLINIUM compounds , *PRECIPITATION (Chemistry) , *PRECIPITATION hardening , *CARBON isotopes , *PHASE transitions , *SOLID solutions - Abstract
Abstract: Ageing treatment at 200°C and 225°C for various periods of time was introduced to the Mg–8.2Gd–3.8Y–1.0Zn–0.4Zr (wt.%) alloy, the age-hardening behaviour and phase transformation were analysed systematically. The alloy aged at 225°C exhibits accelerated ageing progress compared with that aged at 200°C. The precipitation sequences of the alloy aged at both 200°C and 225°C are supersaturated solid solution (SSSS)→β′′ (D019)→β′ (bco). Stacking faults and 14H LPSO phase formed in the alloy over-aged at 200°C and 225°C, respectively. The equilibrium β phase precipitated at the grain boundaries with the formation of precipitate free zone (PFZ) at the peak-aged stage, after further ageing treatment, the β phase got coarsened, which was accompanied with the widening of the PFZ. [Copyright &y& Elsevier]
- Published
- 2013
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