| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1571949 | Materials Characterization | 2008 | 7 Pages |
The microstructure and interfacial reactions of the vacuum brazed titanium alloy (TC4) to stainless steel (1Cr18Ni9Ti) using an AgCuTi filler metal at 920 °C and 980 °C have been investigated. The results show that the main interfacial microstructure of the sample brazed at 920 °C was 1Cr18Ni9Ti/CuTi/Ag-rich + Cu4Ti/Cu4Ti/β-Ti/TC4. Shear tests on brazed specimens show that the fractures occurred in the Ag-rich phase, indicating a ductile fracture type. The recorded room temperature shear strength value of the joint was up to 188 MPa. When the brazing temperature was increased to 980 °C, the interfacial microstructure of the joint became 1Cr18Ni9Ti/Ag-rich/CuTi2/Ti–Cu-rich/β-Ti/TC4. Due to the imposed temperature increment, a large amount of Ag-rich phase was depleted from the joint while CuTi2 and dendritic Ti–Cu-rich phases occupied the brazed joint zone. The fractures after shear testing occurred in the CuTi2 as well as in the Ti–Cu-rich phases. The room temperature shear strength after the 980 °C braze decreased to 123 MPa.
