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Effect of Mo, Zr, and Y on the high-temperature properties of Al–Cu–Mn alloy

Published online by Cambridge University Press:  07 October 2019

Jinhua Ding ,
Chunxiang Cui ,
Yijiao Sun ,
Lichen Zhao  and
Sen Cui
Jinhua Ding
Affiliation:
Key Laboratory for New Type of Functional Material in Hebei Province, School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, People’s Republic of China
Chunxiang Cui*
Affiliation:
Key Laboratory for New Type of Functional Material in Hebei Province, School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, People’s Republic of China
Yijiao Sun
Affiliation:
Key Laboratory for New Type of Functional Material in Hebei Province, School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, People’s Republic of China
Lichen Zhao
Affiliation:
Key Laboratory for New Type of Functional Material in Hebei Province, School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, People’s Republic of China
Sen Cui*
Affiliation:
Key Laboratory for New Type of Functional Material in Hebei Province, School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, People’s Republic of China
*
a)Address all correspondence to this author. e-mail: hutcui@hebut.edu.cn
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Abstract

Mo, Zr, and Y with low diffusion coefficients in Al matrix were used to improve the high-temperature properties of the Al–5.8Cu–0.3Mn–0.2Mg alloy. The effects of these microalloying elements on the microstructures of the Al–5.8Cu–0.3Mn–0.2Mg alloy were investigated with the aid of optical microscopy and high-resolution transmission electron microscope (HRTEM). The HRTEM images and selected area electron diffraction patterns indicated that L12-Al3(Zr, Y), Al3Zr, Al3Y, and Al12Mo could precipitate in the process of solid solution treatment after adding Mo, Zr, and Y. These Mo-, Zr-, and Y-containing precipitates were stable at high temperatures and could slow the coarsening rate of θ′ precipitates at high temperatures. The tensile strength of the Al–5.8Cu–0.3Mn–0.2Mg alloy modified by Mo, Zr, and Y microalloying elements was improved significantly at both room and high temperatures. The strengthening mechanisms were discussed in detail.

Keywords

aluminum alloydiffusionmicrostructure
Type
Article
Information
Journal of Materials Research , Volume 34 , Issue 22 , 28 November 2019 , pp. 3853 - 3861
Copyright
Copyright © Materials Research Society 2019 

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