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Title: Formation mechanism for the nanoscale amorphous interface in pulse-welded Al/Fe bimetallic systems

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.
Authors:
 [1] ;  [2] ;  [2] ;  [3] ;  [3]
  1. The Univ. of Hawaii at Manoa, Honolulu, HI (United States)
  2. Zhejiang Univ., Hangzhou (China)
  3. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Publication Date:
Report Number(s):
PNNL-SA-118220
Journal ID: ISSN 0003-6951; APPLAB
Grant/Contract Number:
AC05-76RL01830
Type:
Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 108; Journal Issue: 20; Journal ID: ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)
Research Org:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
OSTI Identifier:
1327114
Alternate Identifier(s):
OSTI ID: 1253929

Li, Jingjing, Yu, Qian, Zhang, Zijiao, Xu, Wei, and Sun, Xin. Formation mechanism for the nanoscale amorphous interface in pulse-welded Al/Fe bimetallic systems. United States: N. p., Web. doi:10.1063/1.4947465.
Li, Jingjing, Yu, Qian, Zhang, Zijiao, Xu, Wei, & Sun, Xin. Formation mechanism for the nanoscale amorphous interface in pulse-welded Al/Fe bimetallic systems. United States. doi:10.1063/1.4947465.
Li, Jingjing, Yu, Qian, Zhang, Zijiao, Xu, Wei, and Sun, Xin. 2016. "Formation mechanism for the nanoscale amorphous interface in pulse-welded Al/Fe bimetallic systems". United States. doi:10.1063/1.4947465. https://www.osti.gov/servlets/purl/1327114.
@article{osti_1327114,
title = {Formation mechanism for the nanoscale amorphous interface in pulse-welded Al/Fe bimetallic systems},
author = {Li, Jingjing and Yu, Qian and Zhang, Zijiao and Xu, Wei and Sun, Xin},
abstractNote = {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.},
doi = {10.1063/1.4947465},
journal = {Applied Physics Letters},
number = 20,
volume = 108,
place = {United States},
year = {2016},
month = {5}
}