论文部分内容阅读
使用TiZrNiCu非晶钎料成功实现了TiB_w/TC4复合材料和Ti60合金的钎焊连接。通过扫描电子显微镜、能谱仪、X射线衍射仪及万能材料试验机表征钎焊接头的组织及性能。在940°C保温10 min下,钎焊接头的典型界面组织为Ti Bw/TC4复合材料/β-Ti+Ti B晶须/(Ti,Zr)_2(Ni,Cu)金属间化合物层/β-Ti层/Ti60合金。钎焊过程中元素向母材中的扩散过程直接影响接头界面结构。钎焊温度的升高使(Ti,Zr)_2(Ni,Cu)金属间化合物层的厚度减小,当钎焊温度超过1020°C时,(Ti,Zr)_2(Ni,Cu)金属间化合物层消失。钎焊温度较低时,生成的脆性相(Ti,Zr)_2(Ni,Cu)不利于接头性能。接头剪切强度随钎焊温度的升高呈先增加后降低的趋势,在1020°C下获得最大的剪切强度368.6 MPa;而当钎焊温度达到1060°C时,接头强度降低,这是由于形成了粗大的层状(α+β)-Ti组织。
The TiB_w / TC4 composites and Ti60 alloys were successfully brazed with TiZrNiCu amorphous brazing filler metal. The microstructures and properties of brazed joints were characterized by scanning electron microscopy, energy dispersive spectroscopy, X-ray diffraction and universal material testing machine. The typical interfacial microstructure of the braze joint is TiBw / TC4 composite / β-Ti + TiB whisker / (Ti, Zr) _2 (Ni, Cu) intermetallic compound layer / β Ti layer / Ti60 alloy. During the brazing process, the diffusion of the elements into the base metal directly affects the interface structure of the joint. The brazing temperature increases the thickness of (Ti, Zr) _2 (Ni, Cu) intermetallic compound layer. When the brazing temperature exceeds 1020 ° C, Compound layer disappears. When the brazing temperature is low, the brittle phase (Ti, Zr) _2 (Ni, Cu) is not conducive to the joint performance. The shear strength of the joint increased first and then decreased with the increase of the brazing temperature, and the maximum shear strength was 368.6 MPa at 1020 ° C. When the brazing temperature reached 1060 ° C, the strength of the joint decreased due to the formation of The coarse layered (α + β) -Ti tissue.