Formation mechanism for the nanoscale amorphous interface in pulse-welded Al/Fe bimetallic systems
- The Univ. of Hawaii at Manoa, Honolulu, HI (United States)
- Zhejiang Univ., Hangzhou (China)
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Pulse or impact welding traditionally has been referred to as “solid-state” welding. By integrating advanced interface characterizations and diffusion calculations, we report that the nanoscale amorphous interface in the pulse-welded Al/Fe bimetallic system is formed by rapid heating and melting of a thin Al layer at the interface, diffusion of iron atoms in the liquid aluminum, and subsequent rapid quenching with diffused iron atoms in solution. Here, this finding challenges the commonly held belief regarding the solid-state nature of the impact-based welding process for dissimilar metals. Elongated ultra-fine grains with high dislocation density and ultra-fine equiaxed grains also are observed in the weld interface vicinity on the steel and aluminum sides, respectively, which further confirms that melting and the resulted recrystallization occurred on the aluminum side of the interface.
- Research Organization:
- Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- AC05-76RL01830
- OSTI ID:
- 1327114
- Alternate ID(s):
- OSTI ID: 1253929
- Report Number(s):
- PNNL-SA-118220; APPLAB
- Journal Information:
- Applied Physics Letters, Vol. 108, Issue 20; ISSN 0003-6951
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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