Effect of ageing treatment on the precipitation behaviour of Mg–Gd–Y–Zn–Zr alloy
Copyright policy )Effect of ageing treatment on the precipitation behaviour of Mg–Gd–Y–Zn–Zr alloy
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′′ (D0 19 ) → 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.
- Harbin Institute of Technology China (People's Republic of)
- Nagaoka University of Technology Japan
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