Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1578373 | Materials Science and Engineering: A | 2011 | 8 Pages |
The effect of grain size on the high temperature mechanical response of the AZ31 magnesium alloy has been investigated by a comparative analysis of the data obtained in the present study and of several other literature results. The basis of the analysis was a phenomenological description, which took into account the existence of two well defined regimes, the first characterized by a n = 3 stress exponent, and the second described by a modified form of the Garofalo equation, indicating the transition from a viscous-glide to climb as rate controlling mechanisms. The description was modified by introducing a further parameter, the grain size; after this correction, the resulting equations were found to give an excellent description of the weak but non-negligible effect of the grain size on the creep response of the alloy.
► Creep response between 100 and 300 °C of a AZ31 magnesium alloy. ► Grain size has a moderate but non-negligible effect on creep rate. ► The effect is described by introducing the grain size term in a previously developed model. ► Concentration of aluminium in solid solution and grain size are taken into account in the model.