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Open AccessArticle

Microstructure and Mechanical Evolution of Cu-2.7Be Sheets via Annealing

1
School of Mechanical Engineering, Xiangtan University, Xiangtan 411105, China
2
School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore
3
School of Materials Science and Engineering, Central South University, Changsha 410083, China
4
School of Materials Science and Engineering, Harbin Institute of Technology at Weihai, Weihai 264209, China
*
Authors to whom correspondence should be addressed.
Metals 2020, 10(2), 241; https://doi.org/10.3390/met10020241
Received: 7 December 2019 / Revised: 16 January 2020 / Accepted: 7 February 2020 / Published: 11 February 2020
The microstructure and mechanical properties of cold-rolled Cu-2.7Be sheets under various annealing processes and conditions were investigated in this research. The increased beryllium content in the Cu-2.7Be alloy facilitates the formation of brittle secondary phases. Consequently, the study highlights the functionality of annealed Cu-2.7Be alloys as more favorable dynodes than the traditionally used Cu-2.0Be alloys. The mechanism of recrystallization used for the transformation of Cu-2.7Be alloys was that of continuous static recrystallization (cSRX). Moreover, the relationship between the orientation of the β phases and that of the surrounding Cu-matrix was determined to be (111)α∥(110)β and (011)α∥(001)β. The β phase has a body-centered cubic (bcc) structure with a = b = c = 0.281 nm. The β phase undergoes a morphology transformation from primitive lath-shaped β particles to quadrangle-shaped β particles during the annealing process. Such transformations could potentially have an effect on the mechanical properties of Cu-2.7Be sheets. There was a noticeable decline in the yield strength of the Cu-2.7Be after annealing, and the samples annealed at 770 °C for 15 min achieved the elongation with deep and uniform dimples caused by suitable β particle sizes, appropriate grain sizes, and the maximum volume fraction of ∑3 boundaries.
Keywords: Cu-2.7Be alloy; annealing; β phase; recrystallization; mechanical properties Cu-2.7Be alloy; annealing; β phase; recrystallization; mechanical properties
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Liu, Y.; Wang, Q.; Yao, B.; Zhu, D.; Chen, D.; Zhang, P. Microstructure and Mechanical Evolution of Cu-2.7Be Sheets via Annealing. Metals 2020, 10, 241.

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