Microstructural investigation of titanium-niobium interlayer diffusion bonding in Zr۷۰۲ to A۵۱۶ carbon steel

In this study, the diffusion bonding of Zr۷۰۲ alloy to A۵۱۶ low alloy steel was performed using multi-interlayers. diffusion bonding was performed by SPDB method using spark plasma sintering technique (SPS) at temperatures of ۹۰۰ ⁰C and time of ۳۰ minutes. In order to study the microstructure of the interfaces in different joints, a field emission electron microscope (FESEM) equipped with an EDS analyzer was used. The results showed that diffusion was well done in the interface of the interlayers. Nb-Ti solid solution was formed at the Ti/Nb interface that two areas (α-β)Ti (acicular shaped zone I) and β(Ti,Nb)(zone Ⅱ) are visible. The Ti/Nb interface is free from any intermetallic, crack and Discontinuity. Also, the thickness of the mentioned areas (I & Ⅱ) was measured at ۱.۵۲۵ microns in zone I and ۸.۳۹۰ microns in zone ۱, respectively.

Keywords:

Diffusion bonding , SPDB , diffusion bonding interface , reaction layer , Zr۷۰۲ , Niobium