制备及在焊接中的应用
(江苏大学 材料科学与工程学院， 镇江 212013)
摘 要:
关键字: Mg65Cu22Ni3Y10；非晶态合金；扩散钎焊；相界扩散；非晶态钎料
Mg65Cu22Ni3Y10 amorphous alloys
（School of Material Science and Engineering, Jiangsu University,Zhenjiang 212013, China）
Abstract:Bulk Mg65Cu22Ni3Y10 alloy with thickness of 2 mm was fabricated by casting in a traditional copper mould. Full amorphous structure was confirmed by X-ray diffractometry and differential scanning calorimetry (DSC). A welding experiment was performed using Mg-based alloys AM60B as base metal and bulk Mg65Cu22Ni3Y10 amorphous alloy as interlayer between 420 ℃ and 540 ℃. The microstructures and elements distribution of the brazed joints were analyzed by metallographic microscopy, SEM and EDS. The results show that a sound bonded interface is obtained without sheet inclusion, pore and unbinding. The microstructure consists of bulk α-Mg phase and needle compound in the weld metal, element Al diffuses along the grain boundary of the substrate into the welding line. A little Y diffuses into the base metal. A little Mn and Cu segregate and element Ni distributes homogeneously and no segregation appears in weld area.
Key words: Mg65Cu22Ni3Y10; amorphous alloy; diffusion brazing; phase boundary diffusion; amorphous solder alloys
