温度对B_4C_p/Al基复合材料挤压的影响

Extrusion effect of temperature on B_4C_p/Al composites

针对目前挤压制备B_4C_p/6061Al基复合材料中需反复实验确定工艺参数的问题,给出了结合有限元技术仿真模拟挤压过程,分析得出工艺参数的方法.该方法借助Solidworks软件建立了B4Cp/6061Al基复合材料棒料挤压模型,通过热压缩试验数据构建材料的本构方程,完成Deform-3D软件对体积分数为20%的B4Cp/6061Al基复合材料在400℃,450℃,500℃,550℃4种温度下棒材热挤压过程宏观模拟.结果表明,随着温度增加,挤压过程中等效应力减小,等效应变增大,挤压力减小,且在500℃温度下,挤压制备的B4Cp/6061Al基复合棒材损伤最小,等效应力、等效应变及挤压力较合理.该方法可有效分析挤压过程中温度、挤压力等参数,为实际挤压加工提供参考.

Aiming at the problem that B4Cp/6061Al composites’technological parameters must be identified by repeated tests in the extrusion preparation,the finite element technology was used to simulate the extrusion process and the process parameters were obtained.The method established extrusion model for B4Cp/6061Al composites by Solidworks software.The constitutive equation of material was constructed by hot compression test data.Finally the numerical simulation of thermal-mechanical coupling extrusion process for the B4Cp/6061Al composite bar with a volume fraction of 20%at different temperature(400℃,450℃,500℃,550℃)was conducted by use of the Deform-3D numerical simulation software.The results show that with the increase of temperature,the effective stress decreases,the effective strain increases and the extrusion pressure decreases.Under the 500℃extrusion temperature,the damage of B4Cp/6061 Al composite bar is minimum,and effective stress,equivalent strain and extrusion pressure are reasonable.The results show that the method can effectively analyze the parameters such as temperature and extrusion pressure in extrusion process,and throw insight into the actual extrusion processing.