Abstract
Ti−6Al−4V/Al7050 joints were fabricated by a method of insert molding and corresponding interfacial microstructure and mechanical properties were investigated. The interfacial thickness was sensitive to holding temperature during the first stage, and a good metallurgical bonding interface with a thickness of about 90 μm can be obtained at 750°C. X-ray diffraction, transmission electron microscopy, and thermodynamic analyses showed that the interface mainly contained intermetallic compound TiAl3 and Al matrix. The joints featured good mechanical properties, i.e., shear strength of 154 MPa, tensile strength of 215 MPa, and compressive strength of 283 MPa, which are superior to those of joints fabricated by other methods. Coherent boundaries between Al/TiAl3 and TiAl3/Ti were confirmed to contribute to outstanding interfacial mechanical properties and also explained constant fracture occurrence in the Al matrix. Follow-up studies should focus on improving mechanical properties of the Al matrix by deformation and heat treatment.
Highlights
Given the low density, high specific strength, excellent corrosion resistance, notable impact toughness, and significant thermal stability, titanium alloys are widely used in vehicle, aerospace, chemistry, and defense industries
We investigated the interfacial bonding behavior of pure Al and pure Ti joints fabricated by the insert molding method [15]
Ti−6Al−4V/Al7050 joints with outstanding interfacial mechanical properties were successfully fabricated by the insert molding method
Summary
High specific strength, excellent corrosion resistance, notable impact toughness, and significant thermal stability, titanium alloys are widely used in vehicle, aerospace, chemistry, and defense industries. As primary structural materials for commercial and military applications, are known for their excellent mechanical properties, easy to design, and mature manufacturing and inspection techniques These materials face other challenges, such as low hardness and wear resistance, low tensile strength at high temperature, and high linear expansion coefficient [2]. To overcome disadvantages of Ti alloys and Al alloys and to utilize their respective advantages, Ti/Al bimetallic joints have attracted more attentions in recent years [3−12] For these two alloys, significant differences in physical properties, such as melting point and heat conductivity, make conventional preparation techniques unsuitable for fabricating Ti/Al joints. Significant differences in physical properties, such as melting point and heat conductivity, make conventional preparation techniques unsuitable for fabricating Ti/Al joints Novel methods, such as accumulative roll-bonding [3−5], laser welding–brazing [6−7], friction stir welding [8−9], powder metallurgy [10−11], and explosive cladding [12], were attempted. Problems still exist with these fabrication methods: (i) poor interfacial bonding strength, (ii) complex processing procedures, and (iii) limited product sizes for industrial application
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