摘要
针对钛/钢钎焊接头金属间化合物引起的焊缝组织性能恶化问题,通过对比试验,研究了母材匹配面镀Ni层对接头原子扩散行为、微观组织和力学性能的影响机制。结果表明:Ni层对Fe、Ti等元素扩散的阻碍作用程度上存在差异,这种差异性与Ni层在接头区域中的介入位置相关。Ni层阻碍作用改变了Fe、Ti等元素在接头各区域的原子浓度分布,减缓了原子之间的冶金反应程度,降低了脆性金属间化合物的生成量。Ni层的介入可使接头微观组织和力学性能得到有效改善。
Brittle intermetallic compounds in brazing joints of titanium and steel easily worsen their weld organization and mechanical properties. In order to solve this problem, a series of contrast tests in which the Ni layer was plated on the matching surface of base metal or not were conducted and the influencing mechanism of Ni clad layer on the atomic diffusion behavior, microstructure and mechanical properties of the brazing joint were investigated. The results show that the Ni layer blocks the atom diffusion of brazing joints; however, the degrees of obstruction are different among Fe, Ti and other atoms. The difference is closely related to the physical location of Ni layer in the joint region. The obstruction of Ni layer alters osmotic concentration of the atoms, slows down the metallurgical reaction degree, and reduces the content of brittle intermetallic compounds. Consequently, Ni clad layer can effectively improve the microstructure and mechanical properties of the brazing joints.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2016年第2期449-453,共5页
Rare Metal Materials and Engineering
关键词
镀Ni层
原子扩散
剪切强度
金属间化合物
electroless nickel plating
atomic diffusion
shear strength
intermetallic compound
