摘要
Abstract
The Gleeble-3800 thermal simulation testing machine was utilized to assess three different strain rates of AZ91D magnesium alloy sheet at temperatures 25～400 ℃ in the uniaxial tensile.The primary mechanical properties of AZ91D magnesium alloy sheet were then evaluated to assess the influence of strain rate and temperature,and analysis of the fracture morphology of tensile specimens at various temperatures was conducted.The material's flow stress is seen to be decreasing as both strain rate and temperature decrease.At temperature 25～200 ℃,however,the flow stress does not noticeably diminish.At temperatures 250～400 ℃,the flow stress noticeably decreases,and when the temperature reaches 350 ℃,a steady-state flow phenomenon is clearly visible in the material.When the temperature is higher,The strain rate's alteration has a profound effect on the flow stress,which diminishes drastically with a decrease.The material displays remarkable plasticity at high temperatures,and ductile fracture is evidently its fracture mode.关键词
镁合金/单向拉伸/流动应力/变形温度/应变速率Key words
magnesium alloy/uniaxial tension/flow stress/deformation temperature/strain rate分类
矿业与冶金
