Working Hardening Behavior of BAl7-7-2-2 Copper Alloy under Cold Compression Deformation
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摘要: 采用室温压缩试验研究了BAl7-7-2-2铜合金冷的变形加工硬化特性。结果表明,修正后的Ludwik模型可以准确地对BAl7-7-2-2铜合金的真应力-真应变数据进行拟合,相关材料常数K=1 001.736、m=0.295、n=0.044,拟合方程的相关系数可以达到0.96。当真应变ε＜0.02时,加工硬化率很高且迅速增大,此阶段为线性硬化阶段;当0.02≤ε≤0.2时,真应力随着真应变的增加而增大,加工硬化率则逐渐减小,这一阶段为抛物线硬化阶段;ε＞0.2时,随着应变的增加,加工硬化率趋于常数,为弱硬化阶段。结合微观组织和硬度测试表明,材料在不同变形阶段的变形机制有所不同。
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关键词:
- BAl7-7-2-2铜合金 /
- 室温压缩变形 /
- 加工硬化 /
- 微观组织
Abstract: The cold deformation work hardening characteristics of BAl7-7-2-2 copper alloy are investigated by compression test at room temperature. The results show that the modified Ludwik model can accurately fit the true stress-true strain data of BAl7-7-2-2 copper alloy. The relevant material constants K=1 001.736, M=0.295 and n=0.044, and the correlation coefficient of fitting equation can reach 0.96. The work hardening rate is very high and increases rapidly when the true strain ε<0.02. When 0.02 ≤ ε ≤ 0.2, the stress continues to increase with the increase of strain, and the work hardening rate gradually decreases. When ε>0.2, the work hardening rate tends to be constant with the increase of strain, and the stage is weak hardening. The results of microstructure and hardness test show that the deformation mechanism of the material is different at different deformation stages. -
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