作　　者： (张敏）; (王莹）; (王普）; (李继红）;

机构地区： 西安理工大学材料科学与工程学院,陕西西安710048

出　　处： 《热加工工艺》 2017年第17期38-42,共5页

摘　　要： 采用Ni箔作为中间层,对AZ31B/Cu异种金属进行接触反应钎焊试验。对不同工艺参数下所得接头扩散区的组织及性能进行研究,从而找出最佳工艺参数范围。结果表明:当500℃×30 min时,焊接接头组织致密,界面接触良好,接头扩散区由Cu侧灰白色化合物层、层片状共晶组织层和深灰色Mg基体扩散层组成;当焊接温度500℃保温10~30 min时,焊合效果良好,无冶金缺陷;随着保温时间的延长,接头界面区主元素互扩散能力和扩散区宽度均升高;不同保温时间下钎焊接头的显微硬度分布规律基本一致,从Cu侧到Mg基体均呈先增后减的变化趋势,且接头扩散区的显微硬度明显高于两侧母材。 The dissimilar metals of AZ31B and Cu were bonded by the contact reactive brazing process with Ni foil as the interlayer. The microstructure and properties of joints＇ diffusion region under different welding parameters were studied, and the best process parameters were determined. The results show that under the parameters of 500 ℃×30 min, the mierostrueture oft he joint is dense and its interfaces are in good contact. The diffusion region includes gray white compound layer at the side of Cu matrix, lamellar euteetie structure and dark grey diffusion layer at the side of Mg matrix. Under the parameters of 500~C for 10-30 rain, the welding effect is excellent, and it has no metallurgical defects. With the increase of holding time, the mutual diffusion capacity of joint＇s main elements and the width of joint＇s diffusion region increase. Under different holding time, the microhardness distribution of the joint is basically the same, and the microhardness increases firstly and then decreases from Cu side to Mg matrix. The microhardness of joint＇s diffusion region is significantly higher than that of base metals at both sides.

关 键 词： 夹层 接触反应钎焊 元素分布 显微硬度