Abstract
Investigation of creep behavior of AZ31 magnesium alloy at three different temperatures (230, 270, and 350 °C) and stresses of 1–13 MPa reveals that grain boundary sliding (GBS) is the dominant creep mechanism at elevated temperatures and low stresses. GBS and Mg17Al12 precipitates in Mg–Al alloys result in stress concentration sites for cavity formation during high-temperature low-strain rate deformation leading to premature failures. Analysis of fractured surfaces of samples deformed at 350 °C reveals that brittle-type fracture (inter-granular and trans-granular) is the dominant mechanism at low stresses (σ = 1–5 MPa) while at higher stresses (σ = 7–13 MPa) dimple ruptures are predominant. Grain growth, dynamic recovery, and a decrease in dislocation density are characteristics of low-stress deformation of AZ31 alloys in GBS region whereas increase in dislocation density and dynamic recrystallization is noted during deformation under higher stresses where dislocation creep was noted to be predominant.
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