On the exceptional creep resistance in a die-cast Gd-containing Mg alloy with Al addition

Over the past few decades, aluminium (Al) has been considered to be beneficial for castability but detrimental creep resistance of magnesium (Mg) alloys. However, an excellent achieved in a die-cast Mg3.5RE(La,Ce,Nd)1.5GdMnAl alloy, with super low steady-state rate (SCR) 1.35 × 10?10s?1 at 300 °C/50 MPa. Compared counterpart Al-free Mg3.5RE(La,Ce,Nd)1.5GdMn SCR decreased by 71%. The synergistic effect Al, Gd and Mn induced novel thermally stable (TS) AlMnGd ternary short-range order (SRO, 0–2 nm)/cluster (2–10 nm) Mg matrix. After MPa 400 h, SRO was still observed, clusters were under 10 nm coherent High density SRO/clusters observed pinning dislocations, which main reason improvement contrast alloy. TS Mg12RE(La,Ce,Nd) network grain boundaries (GBs) impeded dislocation mobility, also played important role compared traditional Mg-Al-based Under critical conditions °C 50–80 MPa, satisfied power law, dominant mechanisms SRO/cluster drag gliding, associated GB diffusion. This work provides clear evidence long-term existence some alloys critically high temperatures stresses. Moreover, utilization can approach designing heat-resistant