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Effect of thermal cycles on the laser beam welded joint of AA2060 alloys

Published online by Cambridge University Press:  19 July 2018

Ling Mao ,
Huijin Jin ,
Fan Ye ,
Feifei Wang ,
Gang Zheng  and
Sujun Wu
Ling Mao
Affiliation:
School of Materials Science and Engineering, Beihang University (BUAA), Beijing 100191, People’s Republic of China
Huijin Jin
Affiliation:
State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100191, People’s Republic of China
Fan Ye
Affiliation:
School of Materials Science and Engineering, Beihang University (BUAA), Beijing 100191, People’s Republic of China
Feifei Wang
Affiliation:
School of Materials Science and Engineering, Beihang University (BUAA), Beijing 100191, People’s Republic of China
Gang Zheng
Affiliation:
Central Research Institute, Principle Engineer State Nuclear Power Technology Co. Ltd., Beijing 102209, People’s Republic of China
Sujun Wu*
Affiliation:
School of Materials Science and Engineering, Beihang University (BUAA), Beijing 100191, People’s Republic of China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

The effects of the thermal cyclic aging treatment on the microstructure and mechanical properties of 2060 Al–Li alloy laser beam welded joints were investigated. Aging treatments were conducted at different temperatures and for different cycles. Test results showed that the tensile strength of the weld joints increased and the elongation slightly decreased after the thermal cycling treatment. It was also found that the heat affected zone (HAZ) of the welds exhibited a significant increase in microhardness, whilst the microhardness variation of the nondendrite equiaxed zone (EQZ) can be neglected. The strengthening effect of the thermal cycling became more obvious as the temperature and cycles increased. The highest strength of around 513 MPa (96% of the base metal) was obtained at the temperature of 180 °C. Reprecipitation of strengthening phases such as T1 in the HAZ at 180 °C was observed by TEM, which can be considered as the main reason for the strengthening effect of the aging treatment.

Keywords

Alalloymicrostructure
Type
Article
Information
Journal of Materials Research , Volume 33 , Issue 20 , 29 October 2018 , pp. 3439 - 3448
Copyright
Copyright © Materials Research Society 2018 

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