Effects of Ni content on the cast and solid-solution microstructures of Cu-0.4wt%Be alloys |
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| Authors: | Shuang-jiang He Yan-bin Jiang Jian-xin Xie Yong-hua Li Li-juan Yue |
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| Affiliation: | 1.Key Laboratory for Advanced Materials Processing of Ministry of Education, Institute of Advanced Materials and Technology,University of Science and Technology Beijing,Beijing,China;2.Beijing Laboratory of Metallic Materials and Processing for Modern Transportation,University of Science and Technology Beijing,Beijing,China;3.CNMC Ningxia Orient Group Co. Ltd.,Shizuishan,China |
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| 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 Be21Ni5phases 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 Be21Ni5and 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%. |
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