Effects of composition and microstructure on behaviors of electrical resistivity during continuous heating above room temperature in Mg-based alloys

The temperature dependence of electrical resistivity (ER) in pure Mg poly and single crystals, and the commercial Mg alloys AZ31 and AZ80 have been studied during continuous heating from room temperature (RT) to 420 °C. Effects of chemistry, heating rate, grain size, cold deformation and artificial ageing on the behaviors of ER were researched. A complimentary application of differential scanning calorimetric (DSC) analysis gives additional data about the overall processes during continuous heating which explain in more detail the non-monotonic behaviors of ER in these materials.