| 摘要: |
| 采用脉冲加压扩散连接工艺,实现了AZ31镁合金与5083铝合金的连接.借助扫描电镜、EDS、X射线衍射仪和显微硬度计等手段对接头的显微组织及力学性能进行了研究.结果表明,接头有镁合金基体、冶金反应层、扩散层和铝合金基体组成.焊缝中形成了Mg2Al3,AlMg和Al0.56Mg0.44金属间化合物.接头最高硬度值达3300 MPa.随着保温扩散时间的延长,接头的抗拉强度出现了先升高后降低的现象,最高接头强度达46 MPa,在断口中发现了部分韧窝,断口属于韧性和准解理混合断口.在镁合金和铝合金两侧,硬度变化区域出现不对称现象. |
| 关键词: 脉冲加压 扩散连接 显微组织 抗拉强度 |
| DOI： |
| 分类号: |
| 基金项目:国家自然科学基金资助项目(50675234) |
|
| Microstructure and mechanical properties of impact pressure transient liquid phase bonded Mg/Al |
|
LIU Meng'en1,2, SHENG Guangmin1
|
|
1.College of Material Science and Engineering, Chongqing University, Chongqing 400044, China;2.Chongqing Industry Polytechnic College, Faculty of Vehicle Engineering, Chongqing 401120, China
|
| Abstract: |
| Diffusion bonding of magnesium alloy AZ31 and Al5083 was undertaken under an impact pressure in vacuum. The microstructural features,mechanical properties of the joints were investigated by scanning electron microscopy (SEM),energy Dispersive spectrometer(EDS),microhardness tester and x-ray diffractometer. The results show that the joints are formed four layers,such as magnesium alloy matrix,metallurgical reaction layer,diffusion layer and aluminum alloy matrix. There are the intermetallic compounds Mg2Al3,MgAl, Al0.56Mg0.44,and the highest hardness is 3 300 MPa in the joint zone. The tensile test results show that the tensile strength of the joint increases at first, then decreases,and an optimized bonding strength of up to 46MPa. The tensile fracture is mixture of quasi cleavage and dimple. There exists prevailing information asymmetry in the mg side and al side. |
| Key words: impact pressure diffusion bonding microstructure tensile strength |
