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以6061铝合金为对象采用数值模拟和实验验证的方法研究了双向等通道挤压过程金属流动规律。发现双向等通道技术能够在材料内部造成剧烈的剪切变形,具有晶粒细化和形变强化作用,可以通过调整摩擦系数对变形过程进行调控。通过对6061铝合金A、B 2种路径4道次双向等通道挤压发现,双向等通道挤压具有强烈的形变强化作用,在相同道次下,B路径等效应变量大于A路径。
Taking 6061 aluminum alloy as an example, the numerical simulation and experimental verification were carried out to study the metal flow during extrusion of biaxial equal channels. It is found that the bidirectional isochronous technique can cause intense shear deformation in the material, with grain refinement and deformation strengthening. The friction coefficient can be used to control the deformation process. Through the extrusion of 4-way biaxial equal-pass of 6061 aluminum alloy A and B 2 paths, it is found that the bidirectional isotropic extrusion has a strong deformation strengthening effect. Under the same pass, the equivalent strain of path B is larger than that of path A.