Microstructure evolution and precipitation behaviour of the Cu-Ni-Si-Cr alloy based on twin-roll strip casting

IF 1.5 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Philosophical Magazine Pub Date : 2023-03-30 DOI:10.1080/14786435.2023.2191018

G. Cao, Ruixiang Li, Shuang Zhang, Hao Wang, Yuanxiang Zhang

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Abstract

ABSTRACT The twin-roll strip casting (TRSC) process was introduced because of its sub-rapid solidification characteristics, and the element segregation and ageing precipitation of the Cu-6Ni-1.4Si-0.1Cr alloy were studied. The results are as follows: TRSC can effectively refine grain size and inhibit the segregation of the Cu-6Ni-1.4Si-0.1Cr alloy. Two types of precipitates are formed mainly during the ageing process: disk-shaped δ-Ni2Si and rod-shaped β-Ni3Si. The comprehensive properties of the alloy are improved, and the precipitation strengthening mechanism is either from the dislocation shearing mechanism or the Orowan mechanism in different stages of ageing. The Cu-6Ni-1.4Si-0.1Cr alloy achieves optimum performance after ageing at 350°C for 4 h, where the tensile strength and conductivity are 1112 MPa and 27.35% IACS, respectively. The Avrami equations were established for the alloy to describe the kinetics of phase transformation and electrical conductivity during ageing, and the calculated results are consistent with the experimental data.

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双辊铸轧Cu-Ni-Si-Cr合金组织演变及析出行为

摘要:针对双辊带材铸造(TRSC)的亚快速凝固特性，研究了Cu-6Ni-1.4Si-0.1Cr合金的元素偏析和时效析出。结果表明:TRSC能有效细化Cu-6Ni-1.4Si-0.1Cr合金的晶粒尺寸，抑制其偏析;时效过程中主要形成两种析出相:盘状δ-Ni2Si和棒状β-Ni3Si。合金的综合性能得到改善，在时效的不同阶段析出强化机制可能是位错剪切机制，也可能是Orowan机制。在350℃时效4 h后，Cu-6Ni-1.4Si-0.1Cr合金的抗拉强度和电导率分别达到1112 MPa和27.35% IACS。建立了合金时效过程相变动力学和电导率动力学的Avrami方程，计算结果与实验数据吻合较好。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Philosophical Magazine 工程技术-材料科学：综合

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审稿时长

4.7 months

期刊介绍： The Editors of Philosophical Magazine consider for publication contributions describing original experimental and theoretical results, computational simulations and concepts relating to the structure and properties of condensed matter. The submission of papers on novel measurements, phases, phenomena, and new types of material is encouraged.