块体Mg_(65)Cu_(22)Ni_3Y_(10)非晶态合金的制备及在焊接中的应用  

Preparation and application in welding of bulk Mg_(65)Cu_(22)Ni_3Y_(10) amorphous alloys

作　　者：陈振华[1] 司乃潮[1] 张扣山[1] 赵伟[1] 

机构地区：[1]江苏大学材料科学与工程学院,镇江212013

出　　处：《中国有色金属学报》2007年第1期131-137,共7页The Chinese Journal of Nonferrous Metals

摘　　要：利用铜模浇铸法制备了厚度为2mm、成分为Mg65Cu22Ni3Y10块体合金试样，并通过X射线衍射、差热扫描量热仪证实其为完全的非晶态。以镁合金AM60B为母材、2mm厚的Mg65Cu22Ni3Y10板状非晶态合金为中间层，在420～540℃下进行焊接，利用金相显微镜、扫描电镜（SEM）和能谱仪研究了焊接接头的微观形貌和成分分布。结果表明：界面接合良好，未观察到片状夹杂物、气孔及未焊合等缺陷；焊缝区由块状α-Mg相和针状化合物组成，基体中的Al元素通过晶界扩散偏聚到焊缝中，微量Y元素扩散到基体中，有少量的Mn和Cu元素发生偏聚，Ni元素分布均匀，没有发生偏聚现象。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 Mg65Cu22Ni3Y 10 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 a-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.

关 键 词：Mg65Cu22Ni3Y10 非晶态合金 扩散钎焊 相界扩散 非晶态钎料 

分 类 号：TG454[金属学及工艺—焊接]