摘要
The effects of Ni content(0−2.10 wt.%)on the precipitated phase,strength and electrical conductivity of Cu−0.4wt.%Be alloy were investigated,and the influencing mechanism was analyzed.The results showed that the addition of Ni promoted the precipitation of strengthening phase in the alloy and remarkably enhanced the strengthening effect.When the Ni content was increased from 0 to 2.10 wt.%,the strength of the aged alloy initially increased and then decreased,and approached the maximum when the Ni content was 1.50 wt.%.The peak-aging parameters of the alloy containing 1.50 wt.%Ni were the aging temperature of 400℃ and the aging time of 60 min,where the tensile strength and yield strength of the aged alloy were 611 and 565 MPa,respectively,which were 2.8 times and 6.1 times those of the alloy without Ni.The electrical conductivity of the alloy with Ni increased with the aging time,and decreased with the increase of Ni content.With an increase of the aging time at 400℃,phase transition sequence of the Cu−0.4Be−1.5Ni alloy wasγ″phase→γ′phase→γphase.For the aging time of 60 min,a large number of dispersed nano-scale coherentγ″phase andγ′phase formed in the alloy with a remarkable strengthening effect,which was mainly responsible for the high strength of the alloy.
研究Ni含量(0~2.10%,质量分数)对Cu−0.4Be(质量分数,%)合金常规时效析出相、强度和导电率的影响,并分析影响机理。结果表明:添加Ni元素可促进强化相的析出,显著提高时效强化作用。当Ni含量由0增大到2.10%时,合金时效后的强度呈先增大后减小的变化趋势,在Ni含量为1.50%时达到最大;含1.50%Ni合金的峰值时效参数为400℃保温60 min,时效后合金的抗拉强度和屈服强度分别为611 MPa和565 MPa,分别是不含Ni合金的2.8倍和6.1倍;含Ni合金的导电率随着时效时间的延长而增加,但随着Ni含量的增大而下降。在400℃,随着时效时间的延长,Cu−0.4Be−1.5Ni合金发生γ″相→γ′相→γ相转变;当时效时间为60 min时,合金中出现大量弥散分布的纳米级共格γ″相和γ′相,析出强化作用显著,是合金具有较高强度的主要原因。
基金
The authors would like to thank the support from the National Key R&D Programme of China(No.2016YFB0301404)
the National Natural Science Foundation of China(51925401,92066205)
the National Ten Thousand Talents Programme of China and Ningbo“Science and Technology Innovation 2025”major project(No.2019B10087).
