In-situ stabilized beta-Ti in Ti-base alloys to enhance C-f/SiC-Nb heterogenous joint
In-situ stabilized beta-Ti in Ti-base alloys to enhance C-f/SiC-Nb heterogenous joint
复制标题
Ti基合金中的原位稳定β-Ti可增强C-f/SiC-Nb异质接头
DOI：
10.1016/j.jallcom.2018.09.232
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发表时间：
2019
影响因子：
6.2
通讯作者：
Liu Chunfeng
中科院分区：
文献类型：
--
作者：
Sun Yan;Zhang Jie;Yuan Mingliang;Bai Dixing;Liu Chunfeng
提出了一种将三维Cf/SiC与由Ti- zr - cu - ni非晶箔和Ti箔组成的Nb衬底结合的复合箔，以降低钎焊温度，同时保持较高的服务温度。在钎焊过程中，发现钛箔中的Ti和基体中的Nb溶解到钎焊合金中。这种溶解导致了钎焊焊缝成分和显微组织的变化。β-Ti共晶转变受到抑制。钎焊后，钎缝中存在大量原位成形的（Ti,Nb）固溶体，具有较低的弹性模量和良好的变形能力，有利于接头的形成。利用该复合箔成功地获得了无缺陷接头。环境温度下，节理的最大抗剪强度为121 MPa ；600 ℃时，节理的最大抗剪强度为83 MPa 。
A composite foil is proposed to join three-dimensional Cf/SiC to Nb substrate, which is composed of Ti-Zr-Cu-Ni amorphous foil and Ti foil, in order to reduce the brazing temperature, meanwhile keep the high serving temperature. During the brazing process, the dissolution of Ti from Ti foil and Nb from substrate into the brazing alloy was discovered. Such dissolution contributes to a variational composition and microstructure of the brazing seam. The β-Ti eutectoid transformation was suppressed. A high content of thein-situforming (Ti,Nb) solid solution phase was observed in the brazing seam after brazing process, which is considered to be favorable for the joint for its low elastic modulus and good deformability. Defect-free joints are successfully obtained in this work using this composite foil. The maximum shear strength of the joint is measured to be 121 MPa at ambient temperature, and 83 MPa at 600 °C, respectively.