层厚比对Cu-TiB2/Cu层状复合材料微观组织和力学性能的影响

Effects of the Layer Thickness Ratio on the Microstructure and Mechanical Properties of Cu-TiB2/Cu Layered Composites

铜基复合材料由于优异的综合性能在电子封装、电接触等领域具有重要应用价值。然而,克服材料的强-塑性倒置关系一直面临着极大的挑战,层状构型设计被认为是解决该倒置难题的有效策略。本文采用粉末冶金并结合原位反应法,通过控制铺粉工艺,制备出Cu层与TiB2/Cu复合层交叠分布的Cu-TiB2/Cu层状复合材料。研究了Cu-TiB2/Cu层状复合材料的力学性能及断裂特征,并讨论了层状结构参数对材料综合性能的影响。当Cu层与TiB2/Cu复合层的层厚比为1∶3时,Cu-TiB2/Cu层状复合材料的极限抗拉强度(UTS)为315 MPa,断裂伸长率为18%,实现了良好的强塑性匹配。基于复合材料裂纹扩展路径表征与分析,揭示了层状构型设计在抑制裂纹扩展、促使裂纹偏转等方面的作用机制,为高强韧铜基复合材料的构型设计和性能优化提供新思路。

Copper matrix composites with excellent comprehensive properties have potential applications in electronic packaging,electrical contact and other fields.However,overcoming the strength-plasticity inversion relationship of materials has always been a great challenge,and designing a layered configuration is considered to be an effective strategy for solving the inversion problem.In this work,Cu-TiB2/Cu layered composites with overlapping Cu layer and TiB2/Cu composite layer were prepared by powder metallurgy and in situ reaction methods.The tensile properties and fracture characteristics of the Cu-TiB2/Cu layered composites were studied,and the effect of the layered structural parameters on the composite properties was discussed.When the thickness ratio of the Cu layer to the TiB2/Cu composite layer is 1∶3,the ultimate tensile strength(UTS)of the Cu-TiB2/Cu laminated composite is 315 MPa,and the elongation at break is 18%,which indicates good strong plastic matching.Based on the characterization and analysis of the crack propagation paths of composite materials,the mechanism through which layered configuration design inhibits crack propagation and promotes crack deflection is revealed.This study provides a new idea for the configuration design and performance optimization of copper matrix composites with high strength and plasticity.