Effect of Ni interlayer on characteristics of diffusion bonded Mg/Al joints

ABSTRACT

Magnesium and aluminium were joined through diffusing bonding with a Ni interlayer prepared by plasma spraying for the first time. Examination of the microstructure and phase constitution of interfacial regions indicated that Mg–Al reaction was successfully prevented in the presence of the Ni interlayer. With the elevation of temperature, a reaction layer of Mg₂Ni intermetallic was formed at Mg/Ni interface but few Al–Ni intermetallic was generated at Al/Ni interface. The mechanical test results showed that the tensile strength of the Mg/Al joint was substantially improved compared to that of the direct joint of Mg and Al. A maximum value of 5.8 MPa was obtained at 420°C for the joint with Ni interlayer.

KEYWORDS:

• Al–Mg
• Ni interlayer
• interface
• microstructure
• diffusion bonding

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

This work was supported by National Natural Science Foundation of China (NSFC) [grant number 51505122]; Natural Science Foundation of Hebei Province [grant number E2016202088].