摘要
在应变速率为0.01 s^(-1)下对B10铜镍合金进行室温压缩变形试验,最大变形量为50%,研究了其显微组织演变和加工硬化行为,利用修正的Ludwik模型描述了试验合金真应力-真应变曲线。结果表明:试验合金在压缩过程中发生加工硬化,其加工硬化率随真应变增加持续降低,但下降速率变缓;随着变形量增加,试验合金的晶粒拉长,晶粒内部出现变形带和高密度位错,孪晶数量增加,塑性变形机制由位错强化机制逐渐转化为位错强化和变形孪晶的综合强化机制;修正的Ludwik模型σ=Kε^(m+nlnε)可以准确描述试验合金的真应力-真应变曲线,相关系数为0.98。
The compression deformation at room temperature with strain rate of 0.01 s^(-1) of B10 copper-nickel alloy was carried out, and the maximum deformation amount was 50%. The microstructure evolution and work hardening behavior were studied. The modified Ludwik model was used to describe the true stress-strain curve of the test alloy. The results show that the work hardening of the test alloy occured during compression. The work hardening rate decreased continuously with the increase of true strain, but the decreasing rate became slower. With the increase of deformation amount, the test alloy grains elongated, deformation bands and high density dislocation appeared inside the grains, the number of twins increased, and the plastic deformation mechanism gradually changed from the dislocation strengthening mechanism to the comprehensive strengthening mechanism of dislocation strengthening and deformation twins. The modified Ludwik model σ=Kε^(m+nln ε) could accurately fit the true stress-true strain data of the test alloy, and the correlation coefficient was 0.98.
作者
苑伟
潘一帆
郁炎
李冲
韩广
周振亚
YUAN Wei;PAN Yifan;YU Yan;LI Chong;HAN Guang;ZHOU Zhenya(Luoyang Ship Material Research Institute,Luoyang 471023,China;State Key Laboratory for Marine Corrosion and Protection,Luoyang 471023,China)
出处
《机械工程材料》
CAS
CSCD
北大核心
2023年第12期56-60,66,共6页
Materials For Mechanical Engineering
基金
国家重点研发计划项目(2021YFB3700700)。
关键词
铜镍合金
室温压缩变形
加工硬化
微观组织
copper-nickel alloy
room temperature compression deformation
work hardening
microstructure
