The effect of TiB2 ceramic particles on Portevin-Le Chatelier behavior of TiB2/AlMg metal matrix composites
The effect of TiB2 ceramic particles on Portevin-Le Chatelier behavior of TiB2/AlMg metal matrix composites
复制标题
TiB2陶瓷颗粒对TiB2/AlMg金属基复合材料Portevin-Le Chatelier行为的影响
DOI：
10.1016/j.jmrt.2021.07.135
复制
发表时间：
2021-08-11
影响因子：
6.4
通讯作者：
Wang, Haowei
中科院分区：
文献类型：
--
作者：
Chen, Han;Chen, Zhe;Wang, Haowei
金属基复合材料（MMCs）因其优异的力学性能而受到广泛关注。然而，考虑增强颗粒和位错相互作用的金属基复合材料的Portevin-Le Chatelier（PLC）行为却鲜有报道。在本研究中，TiB 2陶瓷颗粒的PLC行为的影响进行了系统的研究，在TiB 2/AlMg复合材料。结果表明，在高应变速率下（>0.01 s（-1）），颗粒相使PLC的临界应变比AlMg合金有所降低，但随着应变速率的降低，两者的差异逐渐减小。基于实验表征和理论模型，从位错等待时间的角度讨论了粒子的双重作用。结果表明，在高应变速率下，颗粒的存在使等待时间增加，导致临界应变降低，但随着应变速率的降低，颗粒引起的额外等待时间占总等待时间的比例逐渐减小，导致颗粒的作用减弱. (C)2021年，任作者。由爱思唯尔公司出版
Metal matrix composites (MMCs) have attracted extensive attention due to their excellent mechanical properties. However, the Portevin-Le Chatelier (PLC) behavior of MMCs considering the interaction of reinforced particles and dislocations is rarely reported. In the present study, the influence of TiB2 ceramic particles on PLC behavior is systematically investigated in a TiB2/AlMg composite. It is found that particles decrease the critical strain of PLC at high strain rate (>0.01 s(-1)) compared with AlMg alloy, but their difference becomes small with the decrease of strain rate. The dual effects of particles are discussed in terms of dislocation waiting time based on experimental characterizations and theoretical modeling. It is shown that with the presence of particles, the waiting time increases at high strain rate, leading to the decrease of critical strain, but the proportion of additional waiting time induced by particles in overall waiting time gradually decreases with the decrease of strain rate, leading to the weakening of the effect of particles. (C) 2021 The Author(s). Published by Elsevier B.V.