【摘要】 采用Deform-3D有限元软件研究了平行模压变形、180°交叉模压变形、90°交叉模压变形三种限制模压变形(constrained groove pressing,CGP)方式对AZ31镁合金板材等效应变累积分布的影响,并在250℃和300℃进行了二道次的模压变形试验,研究了模压温度、道次及变形方式对材料晶粒细化的影响。结果表明,三种模压变形方式累积的等效应变基本相同,但90°交叉模压变形对晶粒的细化效果更明显,在300℃下用90°交叉模压变形获得了晶粒尺寸为4.47μm的细晶镁合金。更多还原

【Abstract】 Finite element simulation was carried out by means of the Deform-3D finite element software for analyzing the accumulation of equivalent strain of AZ31 magnesium alloy processed by constrained groove pressing( CGP),such as cross CGP 180°,cross CGP 90°and parallel CGP. In addition,experiments were conducted at 250℃ and 300℃ for investigation of grain refinement as a function of CGP pass,deformation mode and temperature.The results show that the three CGP deformation modes have little difference on the accumulation of equivalent strain,but the 90°cross CGP shows more advantages on refining grains.Fine-grained magnesium alloy with the average grain size of 4. 47 μm was obtained by using the 90°cross CGP at 300℃.更多还原