镁/铝层状复合材料的扩散连接制备及界面特性

Fabrication of Magnesium/aluminum Laminated Composites by Diffusion Bonding and Its Interface Properties

采用扩散连接制备了镁/铝层状复合材料,进而采用热处理改善界面结合性能,最后利用纳米压痕技术初步研究了复合材料的界面结合状况。结果表明,采用400℃/30MPa/10min、400℃/40MPa/10min和400℃/30MPa/20min3种条件均可获得连接较好的层状复合材料,但400℃/30MPa/10min条件下扩散层不明显;利用热处理可以改善界面结合状况,对于扩散层明显的复合材料,热处理可以大大增加扩散层厚度;扩散层的纳米硬度比基体高约3倍,弹性模量介于镁合金的与铝合金的之间。

Magnesium/aluminum laminated composites were fabricated by diffusion bonding method,and interfacial characteristics were measured by nano-indentation to know how to improve the interfacial properties of heat treated composites.The results reveal that laminated composites with desirable bonding can be prepared by the diffusion bonding with three sets of processing parameters,including 400 ℃/30 MPa/10 min,400 ℃ /40 MPa/10 min,400 ℃/30 MPa/20 min,however,the diffusion layer is not visible in the condiions of 400 ℃/30 MPa/10 min.Diffusion layer thickness of the composites can be remarkably increased with heat treatment,and nano-hardness of diffusion zone is 3 times higher than that of the matrix,and the Young's modulus is located in the range of that of magnesium alloy and aluminum alloy.