Abstract
In this research work, the transient liquid phase (TLP) bonding process was utilized to fabricate joints using thin (20μm) nickel and copper foils placed between two bonding surfaces to help facilitate joint formation. Two joint configurations were investigated, first, Ti-6Al-4V/CuNi/Mg-AZ31 and second, Ti-6Al-4V/NiCu/Mg-AZ3L The effect of bonding time on microstructural developments across the joint and the changes in mechanical properties were studied as a function of bonding temperature and pressure. The bonded specimens were examined by metallographic analysis, scanning electron microscopy (SEM), and X-ray diffraction (XRD). In both cases, intermetallic phase of CuMg2 and Mg3AlNi2 was observed inside the joint region. The results show that joint shear strengths for the Ti-6Al-4V/CuNi/Mg-AZ31 setup produce joints with shear strength of 57 MPa compared to 27MPa for joints made using the Ti-6Al-4V/NiCu/Mg-AZ31 layer arrangement.
Highlights
The Ti-6Al-4V alloy has a high specific strength, good oxidation resistance, and high elastic modulus which makes it an attractive choice for aerospace, marine, and oil and gas industries [1,2,3]
The results show that joint shear strengths for the Ti-6Al-4V/CuNi/MgAZ31 setup produce joints with shear strength of 57 MPa compared to 27MPa for joints made using the Ti-6Al-4V/NiCu/Mg-AZ31 layer arrangement
Microstructural development The scanning electron microscopy (SEM) micrograph of joint interface for Ti-6Al-4V/NiCu/Mg-AZ31 made at 515oC bonding temperature, 0.35 MPa bonding pressure for10 min bonding times is shown in figure 2
Summary
The Ti-6Al-4V alloy has a high specific strength, good oxidation resistance, and high elastic modulus which makes it an attractive choice for aerospace, marine, and oil and gas industries [1,2,3]. The transient liquid phase (TLP) bonding process was utilized to fabricate joints using thin (20μm) nickel and copper foils placed between two bonding surfaces to help facilitate joint formation. In order to take advantage of the lower eutectic temperature of Cu and the better joint quality produced using nickel foils a combination of both foils may produce fewer hard intermetallic phases inside the joint region and give better joint shear strengths.
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