Abstract
This work investigates the effect of dislocation array induced β’ precipitation bands on the creep behavior in wrought Mg-8.9Gd-1.8Y-0.5Zr-0.2Ag (wt%) alloy. The alloy with β’ precipitate bands shows significantly enhanced creep resistance ranging from 448 to 548 K. Pipe diffusion-controlled grain boundary sliding (GBS) is suggested to be the main steady creep mechanism below 498 K. Cross-slip is suggested to be the main steady creep mechanism above 498 K. The characterization indicates that the precipitate bands separate the matrix into multiple units within the grains and restrict the long-distance slip of the dislocations. Bands with high thermal stability limit the diffusion of vacancies across the grain and prevent precipitation free zone (PFZ) broadening on the grain boundaries. For the alloy without precipitate bands, basal slip is initiated before the formation of β’, and it is easy to form broad PFZs on grain boundaries. Although cross-slip is still unavoidable at 523 K, these results provide guidance for improving the creep resistance of the deformed Mg-Gd series alloys.
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