具有贯穿结构的铜/铝复合材料的强化及热导率

Strengthening behavior and thermal conductivity of Cu/Al composite with penetration architecture

为了在提高铝合金强度的同时避免降低其热导率,设计了一种具有单向贯穿结构的新型铜/铝双金属复合材料,并采用增材制造结合挤压铸造的工艺实现制备成形。该复合材料表现出较好的强度(约340 MPa)和热导率(200 W/(m·K))匹配性,综合性能超过传统铝合金。这种良好的导热性能归因于单向贯穿的Cu骨架增强体结构能够为电子传导提供快速通道。同时,界面处生成Al2Cu共晶相,实现良好的界面冶金结合,有效改善复合材料的力学性能。

To improve the strength of Al alloys without severely deteriorating the thermal conductivity,the Cu/Al bimetallic composite comprising penetration architecture was artificially designed and fabricated via the additive manufacturing combined with the squeeze casting.The composite exhibited a good balance of the strength(~340 MPa)and thermal conductivity(200 W/(m·K)),outperforming the traditional Al alloys.High thermal conduction is attributed to the geometrical Cu scaffold,which provides a rapid pathway for the electron conduction.Simultaneously,the good metallurgical bonding is attained by the formation of the Al2Cu eutectic phase along the interfaces,which effectively enhances the strength of the Cu/Al composite.