Tuesday, July 7, 2020

200711 Stick Things Together: Brief Introduction of Solid-State Bonding of Dissimilar Metals

Title:
Stick Things Together: Brief Introduction of Solid-State Bonding of Dissimilar Metals

Speaker:
林哲宇 (Jhe-Yu Lin), PhD, National Institute for Materials Science (NIMS)

Time:
*注意:本週演講時間略有調整
07/11 (Sat.) 1 am PDT, 2 am MDT, 3 am CDT, 4 am EDT
07/11 (Sat.) 4 pm Taiwan (UTC+8), 5pm Japan (UCT+9)

Keywords:
Materials engineering, Metal processing, Ultrasonic welding, Solid-state bonding, Dissimilar metal bonding, Interfacial reaction




Abstract:
In this talk, the background of solid-state bonding techniques will be firstly introduced, such as diffusion bonding, friction welding and so on. Among of them, ultrasonic welding (USW) is a bonding technique having versatility of bonding dissimilar materials with short welding time and lower bonding temperature. Regarding interfacial phenomena during USW, plastic deformation, recrystallization, and the formation of IMC due to frictional heat and direct contact have been investigated, but the understandings of those interfacial phenomena correlated to bonding strength evolution are still limited, which are highly relevant to the practical use of USW. This talk will focus on explaining the relationship between bonding development and bonding strength evolution in joining steel and other metals using USW. For this purpose, several kinds of metals (Ni, Al, Ti) with various conditions are employed to be joined with steel. Interfacial phenomena occurred between dissimilar metals are correlated with bonding strength evolution from the early stage to the achievement of bonding, including severe plastic deformation, material transfer, phase transformation. The understandings obtained from this work provide a further viewpoint on joining dissimilar metals by using solid-state bonding.

No comments:

Post a Comment