摘要
采用真空电弧熔炼法制备钛基钎料Ti-25Cu-15Ni(at.%),通过DSC、SEM和XRD分析确认该钎料的焊接温度和微观组织结构及形貌。采用该钎料钎焊工业纯钛TA0,并分析焊接接头的微观组织结构。结果表明,该钎料主要由α-Ti和Ti2Cu共晶组织构成,在1 000℃焊接温度下,在钎料/焊接母材接头界面,有大量的Ti2Cu和TiNi化合物形成。同时,在靠近母材部分存在α-Ti+TiNi共晶组织,Ni元素扩散到钛合金母材中形成针状TiNi化合物,有利于连接强度的提高。测试了在1 000℃下的不同保温时间对试样拉伸强度的影响,结果表明,1 000℃下保温30 min制备的连接件最大拉伸强度为185.65 MPa。
The solder of Ti-25Cu-15Ni was prepared by vacuum arc melting. The welding temperature and the microstructure of the solders were confirmed by the Differential Scanning Calorimeter （DSC）, Scanning Electron Microscope （SEM） and X-ray Diffraction （XRD） method. The pure titanium TA0 were welded by this solder and the microstructure of the joint interface was identified. The results show that the Ti-25Cu-15Ni solder is mainly composed eutectic structure of a-Ti and Ti2Cu phases. Simultaneously, at the welding temperature of 1 000 ℃, there are lots of Ti2Cu and TiNi produced on the joint interface between solder and Ti, and there is a large number of eutectic structures composed by a-Ti and TiNi near the Ti base metal due to Ni element diffused into titanium and formed acicular compounds of TiNi, which is beneficial to improve the welding strength of the Ti metal. On the other hand, the influence of holding time on the tensile strength of sample at 1 000 ℃ was studied. It is clearly demonstrated that the tensile strength of the optimal joint is 185.65 MPa when the holding time is 30 min at 1 000 ℃.
出处
《粉末冶金材料科学与工程》
EI
北大核心
2013年第4期604-608,共5页
Materials Science and Engineering of Powder Metallurgy
基金
国家自然科学基金创新研究群体资助项目(51021063)
关键词
钎焊
钛基钎料
微观组织
反应界面
拉伸强度
brazing
titanium-based solder
microstructure
interface of the reaction
tensile strength
