挤压温度对石墨烯/7075Al复合材料分流模挤压制品纵向焊缝微观组织和力学性能的影响

doi:10.13229/j.cnki.jdxbgxb.202402147

摘要/Abstract

摘要：

为提高铝基复合材料分流模挤压过程中纵向焊缝的焊合质量，以石墨烯增强7075铝基复合材料（GNP/7075Al）分流模挤压制品为研究对象，主要探讨了挤压温度对铝基复合材料分流模挤压制品纵向焊缝微观组织和力学性能的影响。结果显示：随着挤压温度升高，金属原子的扩散速度增加，粗大的第二相明显减少，更多的第二相粒子逐渐溶解到铝基体和焊缝中。适当提高挤压温度，有利于形成良好的焊合界面，提高纵向焊缝的质量，但如果温度过高，一方面会引起基体过度动态再结晶等软化行为，从而削弱形变强化效果，另一方面会使焊合静水压力降低，影响增强相石墨烯的完整性，进而引起整体强度下降。在480 ℃挤压温度下，基体适度的动态再结晶和固溶增强以及强化相石墨烯的最佳状态使得挤压态纵向焊缝的焊合线最窄，分流焊合效果最好，焊合质量和综合力学性能最优，纵向焊缝的横向抗拉强度为279.98 MPa。

关键词: 复合材料, 分流模挤压, 挤压温度, 微观组织, 力学性能

Abstract:

The effects of extrusion temperature on the microstructure and mechanical properties of longitudinal welds in aluminum matrix composites were investigated using graphene-reinforced 7075 aluminum matrix composites （GNP/7075Al） to enhance the welding quality during shunt die extrusion process.The results show that with the increase of extrusion temperature， the diffusion rate of metal atoms increases， the coarse second phases are obviously reduced， and more second phase particles are gradually dissolved into the aluminum matrix as well as the longitudinal weld. Appropriately increasing the extrusion temperature is conducive to forming a good welding interface and improving the quality of longitudinal weld. However， if the temperature is too high， the soft processes for the matrix such as dynamic recrystallization will decrease the deforming hardening of the extrusion， the weld pressure decrease， and the structure integrity of the graphene will be destroyed， decreasing the properties of the extrudate. At the extrusion temperature of 480℃， the welding line is the narrowest and the weld property is the best. Moderate dynamic recrystallization， solid solution strengthening of the matrix and the best state of the enhanced phase graphene brought the best weld quality and comprehensive mechanical properties of the extrudate with the tensile strength of 279.98 MPa.

Key words: composites, porthole die extrusion, extrusion temperature, microstructure, mechanical property

中图分类号:

TG376.2

娄淑梅,周乐,陈鹏,杜安博,赵豪,苗雨. 挤压温度对石墨烯/7075Al复合材料分流模挤压制品纵向焊缝微观组织和力学性能的影响[J]. 吉林大学学报(工学版), 2025, 55(11): 3575-3582.

Shu-mei LOU,Le ZHOU,Peng CHEN,An-bo DU,Hao ZHAO,Yu MIAO. Effect of extrusion temperature on the microstructure and mechanical properties of longitudinal weld in a porthole die extruded GNP/7075Al composite[J]. Journal of Jilin University(Engineering and Technology Edition), 2025, 55(11): 3575-3582.

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