Effects of Ni content on the cast and solid-solution microstructures of Cu-0.4wt%Be alloys

Shuang-jiang He; Yan-bin Jiang; Jian-xin Xie; Yong-hua Li; Li-juan Yue

doi:10.1007/s12613-018-1611-x

Volume 25 Issue 6

Jun. 2018

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2018 > 25(6): 641-651

Shuang-jiang He, Yan-bin Jiang, Jian-xin Xie, Yong-hua Li, and Li-juan Yue, Effects of Ni content on the cast and solid-solution microstructures of Cu-0.4wt%Be alloys, Int. J. Miner. Metall. Mater., 25(2018), No. 6, pp. 641-651. https://doi.org/10.1007/s12613-018-1611-x

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Shuang-jiang He, Yan-bin Jiang, Jian-xin Xie, Yong-hua Li, and Li-juan Yue, Effects of Ni content on the cast and solid-solution microstructures of Cu-0.4wt%Be alloys, Int. J. Miner. Metall. Mater., 25(2018), No. 6, pp. 641-651. https://doi.org/10.1007/s12613-018-1611-x

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Research Article

Effects of Ni content on the cast and solid-solution microstructures of Cu-0.4wt%Be alloys

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Corresponding author:
Jian-xin Xie E-mail: jxxie@mater.ustb.edu.cn
Received: 25 August 2017; Revised: 13 October 2017; Accepted: 22 November 2017

Abstract

Abstract

The effects of Ni content (0–2.1wt%) on the cast and solid-solution microstructures of Cu-0.4wt%Be alloys were investigated, and the corresponding mechanisms of influence were analyzed. The results show that the amount of precipitated phase increases in the cast alloys with increasing Ni content. When the Ni content is 0.45wt% or 0.98wt%, needle-like Be₂₁Ni₅ phases form in the grains and are mainly distributed in the interdendritic regions. When the Ni content is 1.5wt% or greater, a large number of needle-like precipitates form in the grains and chain-like Be₂₁Ni₅ and BeNi precipitates form along the grain boundaries. The addition of Ni can substantially refine the cast and solid-solution microstructures of Cu-0.4wt%Be alloys. The hindering effects of both the dissolution of Ni into the matrix and the formation of Be–Ni precipitates on grain-boundary migration are mainly responsible for refining the cast and solid-solution microstructures of Cu-0.4wt%Be alloys. Higher Ni contents result in finer microstructures; however, given the precipitation characteristics of Be–Ni phases and their dissolution into the matrix during the solid-solution treatment, the upper limit of the Ni content is 1.5wt%–2.1wt%.
- beryllium-copper alloys;
- alloying;
- Ni content;
- microstructure;
- solid-solution treatment

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References

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