Abstract
Grain-scale creep straining processes in die-cast and permanent-mold-cast Mg–Al–Ca alloys have been studied. High-temperature strain mapping with electron backscattered diffraction analysis reveals favorably oriented grains deforming preferentially during creep. Displacements of microstructural-scale markers applied along grain boundaries and within grain interiors demonstrate no significant contribution of grain boundary sliding to creep. Creep rates at 175 °C display an inverse dependence on grain size, with fine -grained die-cast material possessing the highest creep resistance. Implications for the design of future alloys are discussed.
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