Particle size effect in metallic materials: a study by the theory of mechanism-based strain gradient plasticity
Particle size effect in metallic materials: a study by the theory of mechanism-based strain gradient plasticity
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DOI：
10.1016/s1359-6454(01)00325-1
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发表时间：
2002-01
期刊：
影响因子：
9.4
通讯作者：
Zhenyu Xue;Yonggang Huang;Ming Li
中科院分区：
文献类型：
--
作者：
Zhenyu Xue;Yonggang Huang;Ming Li
第二相粒子的尺寸对金属及其合金或金属基复合材料的宏观塑性加工硬化行为有着重要的影响。经典的塑性理论不能解释这种尺寸效应，因为它们的本构关系没有内部材料长度。我们使用基于机制的应变梯度（MSG）塑性理论来研究颗粒尺寸效应，并发现与碳化硅颗粒增强铝基体的实验以及其他应变梯度塑性理论的先前数值研究的良好协议。结果表明，在固定的颗粒体积分数，较小的颗粒给更大的复合材料的塑性加工硬化比大颗粒做。
It is a significant fact that the size of second-phase particles has an important effect on the macroscopic plastic work hardening behavior of metals and their alloys or metal–matrix composites. The classical plasticity theories cannot explain this size effect since their constitutive laws possess no internal material lengths. We use the theory of mechanism-based strain gradient (MSG) plasticity to investigate the particle size effect and find good agreements with the experiments of aluminum matrix reinforced by silicon carbide particles as well as with prior numerical studies by other strain gradient plasticity theories. It is shown that, at a fixed particle volume fraction, smaller particles give larger plastic work hardening of the composite than large particles do.