The impression creep behaviour of a TIG-welded semisolid cast AXE622 Mg alloy is investigated at the temperature range of 423–498 K and the stress range of 450–600 MPa. After creep, the (Mg–Al)2Ca phase loses its continuity in the HAZ, and some evidence of particle fracture is obvious. Except at 423 K, where the HAZ exhibits a higher creep resistance than in the FZ, the creep resistance decreases from BM to FZ. The power-law break dawn is the rate-controlling creep in BM though the dislocation creep is dominant in HAZ and FZ. Moreover, the creep is controlled by pipe diffusion in BM while a dislocation nucleation mechanism at the boundary surface is activated in the HAZ and FZ.
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