A New Creep Constitutive Model for 7075 Aluminum Alloy Under Elevated Temperatures

摘要: Exposure of aluminum alloy to an elastic loading, during “creep-aging forming” or other manufacturing processes at relatively high temperature, may lead the lasting creep deformation. The behaviors 7075 are investigated by uniaxial tensile experiments over wide ranges temperature and external stress. results show that studied strongly depend on stress, time. With increase strain increases quickly. In order overcome shortcomings Bailey-Norton law θ projection method, a new constitutive model is proposed describe variations with time for alloy. model, dependences well taken into account. A good agreement between predicted measured strains shows established can give accurate description Meanwhile, obtained stress exponent indicates process controlled dislocation glide, which verified microstructural observations.