TY - JOUR
T1 - Hardness distribution and aging response associated with precipitation behavior in a laser pressure welded Al–Li alloy 2198
AU - Zhao, Tianbo
AU - Sato, Yutaka S.
AU - Xiao, Rongshi
AU - Huang, Ting
AU - Zhang, Jingquan
N1 - Funding Information:
The authors are grateful to Prof. Peng Li, of Dalian University of Technology, for his helpful discussion. The authors would like to thank the Interdepartmental Doctoral Degree Program for Multidimensional (MD) Materials Science Leaders, Tohoku University Program for Leading Graduate Schools for the scholarships granted. The authors also acknowledge funding from National Natural Science Foundation of China [Grant No. 51475011].
Funding Information:
The authors are grateful to Prof. Peng Li, of Dalian University of Technology, for his helpful discussion. The authors would like to thank the Interdepartmental Doctoral Degree Program for Multidimensional (MD) Materials Science Leaders, Tohoku University Program for Leading Graduate Schools for the scholarships granted. The authors also acknowledge funding from National Natural Science Foundation of China [Grant No. 51475011 ].
Publisher Copyright:
© 2021 Elsevier B.V.
PY - 2021/3/18
Y1 - 2021/3/18
N2 - Although laser welded Al–Li alloys show great potential for application in aerospace industry, the detailed relationship between local hardness and complex microstructure remained unclear. In the present study, relationship between precipitation behavior and local hardness in a defect-free laser pressure weld of Al–Li alloy 2198 was systematically examined by transmission electron microscopy. Hardness profile of the laser pressure weld was reduced in the vicinity of the weld center, mainly explained by size and density of the strengthening precipitates. Moreover, post-weld aging increased the density of strengthening precipitates in the precipitate-dissolved regions, increasing their hardness values markedly. On the other hand, a few precipitates were formed in the precipitate-coarsened regions during post-weld aging, which slightly increased the local hardness. The variation in hardness during post-weld aging could be well correlated with the precipitation behavior in each region of the laser pressure weld.
AB - Although laser welded Al–Li alloys show great potential for application in aerospace industry, the detailed relationship between local hardness and complex microstructure remained unclear. In the present study, relationship between precipitation behavior and local hardness in a defect-free laser pressure weld of Al–Li alloy 2198 was systematically examined by transmission electron microscopy. Hardness profile of the laser pressure weld was reduced in the vicinity of the weld center, mainly explained by size and density of the strengthening precipitates. Moreover, post-weld aging increased the density of strengthening precipitates in the precipitate-dissolved regions, increasing their hardness values markedly. On the other hand, a few precipitates were formed in the precipitate-coarsened regions during post-weld aging, which slightly increased the local hardness. The variation in hardness during post-weld aging could be well correlated with the precipitation behavior in each region of the laser pressure weld.
KW - Al–Li alloy
KW - Artificial aging
KW - Hardness profile
KW - Laser pressure welding
KW - Microstructural characterization
KW - Precipitation sequence
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U2 - 10.1016/j.msea.2021.140946
DO - 10.1016/j.msea.2021.140946
M3 - Article
AN - SCOPUS:85101348925
VL - 808
JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
SN - 0921-5093
M1 - 140946
ER -