Effect of bonding time on the joint properties of transient liquid phase bonding between Ti--6Al--4V and AISI 304

• Published in: Journal of alloys and compounds 2017-04, Vol.701, p.335-341
• Main Authors: Norouzi, Ehsan, Atapour, Masoud, Shamanian, Morteza
• Format: Article
• Language: English
• Subjects: AISI 304; Austenitic stainless steels; Bonded joints; Bonding strength; Bonding time; Chemical bonds; Chemical compounds; Ductile-brittle transition; Failure modes; Fracture surfaces; Interlayers; Intermetallic compounds; Mechanical properties; Mechanical tests; Microscopy; Optical microscopy; Shear strength; Spectrum analysis; Ti-6Al-4V; Titanium base alloys; Transient liquid phase (TLP); Transient liquid phase bonding
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2017.01.091

Transient liquid phase (TLP) bonding was employed to join Ti--6Al--4V and AISI 304 through a copper interlayer. The effect of the bonding time on the interfacial and mechanical properties of the TLP bonded was investigated at 960 °C. The morphology of the joints was evaluated by optical microscopy, scanning electron microscopy (SEM) and Energy Dispersive Spectroscopy (EDS). The results showed that the width of the joint was increased and then decreased with enhancing the bonding time. The occurrence of different intermetallic compounds such as Ti2Cu, Ti2Cu3, TiCu2, TiCu4, TiCu and FeTi was predicted for different bonding times, except at 60 min. Prolonging the holding time from 15 to 60 min resulted in a joint solidified isothermally, producing the single phase solid solution β-Ti at the interface. The results from mechanical testing also showed that the maximum shear strength of 374 MPa was obtained with the bonding time of 60 min, which was equal to 70% of the Ti--6Al--4V strength. Observation of fracture surfaces revealed two kinds of failure modes: brittle and mixed brittle-ductile. [Display omitted] •The width of the joint was increased and then decreased by increasing the bonding time.•The isothermal solidification was completed at 960 °C for 60 min.•The maximum average shear strength of 374 MPa was obtained, which reached to 0.7 of the Ti-6Al-4V strength.•A longer bonding time was preferred for joining Ti-6Al-4V to AISI 304.