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Precipitation of T1 phase in 2198 Al–Li alloy studied by atomic-resolution HAADF-STEM

Published online by Cambridge University Press:  07 May 2019

Kexin Lv ,
Chenyang Zhu Open the ORCID record for Chenyang Zhu [Opens in a new window] ,
Jingxu Zheng ,
Xiaodong Wang  and
Bin Chen Open the ORCID record for Bin Chen [Opens in a new window]
Kexin Lv
Affiliation:
School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Chenyang Zhu
Affiliation:
School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Jingxu Zheng
Affiliation:
School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Xiaodong Wang
Affiliation:
School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Bin Chen*
Affiliation:
School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
*
a)Address all correspondence to this author. e-mail: steelboy@sjtu.edu.cn
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Abstract

Aging treatment plays an important role in strengthening of 2198 Al–Li alloy. Through a serious of heat treatment processes, a large amount of precipitates emerge, mainly observed to be θ′(Al2Cu), Al3Zr, and T1(Al2CuLi), among which, T1 turns to be the most important precipitate that contributes to the strengthening of 2198 Al–Li alloy. While the temperature of the aging process is 175 °C, the density and size of T1 phase keep increasing through the process and reach peak in about 18 h. T1 phase tends to have a certain orientation relationship of ${\left( {0001} \right)_{{{\rm{T}}_1}}}//{\left\{ {111} \right\}_{{\rm{Al}}}}$, ${\left\langle {1010} \right\rangle _{{{\rm{T}}_{\rm{1}}}}}//{\left\langle {110} \right\rangle _{{\rm{Al}}}}$ and may have different kinds of multilayered structures. In most of the multilayered structures, the distance between two adjacent copper-rich laths is less than that in classical single-layered phase. Thus, it can be inferred that the microstructure of T1 phase might change in the process of developing from single-layered structure to multilayered structure. In addition, the interactions between different phases become relatively frequent when the density of T1 phase reaches a threshold.

Keywords

aging2198 Al–Li alloyT1 phaseHAADF-STEMGPA

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Article
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Journal of Materials Research , Volume 34 , Issue 20 , 28 October 2019 , pp. 3535 - 3544
Copyright
Copyright © Materials Research Society 2019 

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