块体Mg65Cu22Ni3Y10非晶态合金的制备及在焊接中的应用

来源期刊:中国有色金属学报2007年第1期

论文作者:陈振华 司乃潮 张扣山 赵伟

文章页码:131 - 131

关键词:Mg65Cu22Ni3Y10;非晶态合金;扩散钎焊;相界扩散;非晶态钎料

Key words:Mg65Cu22Ni3Y10; amorphous alloy; diffusion brazing; phase boundary diffusion; amorphous solder alloys

摘    要:

利用铜模浇铸法制备了厚度为2 mm、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、2 mm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。

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.

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