Influence of hot rolling and evolved microstructure on high cycle fatigue behaviour of Mg-4Zn-4Gd alloy

摘要: Abstract The high cycle fatigue behaviour of bulk nanostructured Mg-4Zn-4Gd magnesium alloy, produced through hot rolling with different reductions such as 50% (corresponding true strain, eT −0.693), 75% (eT, −1.386) and 85% −1.897) was investigated. solution treatment the alloy performed at 673 K for 24 h in order to achieve equiaxed microstructure prior rolling. microstructural characteristics were examined light microscopy. influence several features dislocation, deformation twins, micro/nano-precipitate, ultrafine grains on tensile hardness is used understand life (Nf) processed material. Along aspects, effects varying applied stress amplitude (σa) cyclic hardening zone also analysed quantify its rolled materials. specimen has shown maximum (i.e. ≥ 1.5 × 106) 75 MPa amplitude. associated fracture mechanism explored scanning electron fractography subjected HCF regime. All influencing factors characterised by using transmission microscopy along X-ray results.