Hot deformation behavior and mechanism of hybrid aluminum-matrix composites reinforced with micro-SiC and nano-TiB2
Hot deformation behavior and mechanism of hybrid aluminum-matrix composites reinforced with micro-SiC and nano-TiB2
复制标题
微米SiC和纳米TiB2增强铝基杂化复合材料的热变形行为及机理
DOI：
10.1016/j.jallcom.2018.04.223
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发表时间：
2018-07-15
影响因子：
6.2
通讯作者：
Zhang, Hui
中科院分区：
文献类型：
--
作者：
Chen, Xinrong;Fu, Dinfa;Zhang, Hui
在Gleeble-3500热模拟试验机上进行了变形温度为350-500 ℃、应变速率为0.001 ~ 1 s（-1）的微米SiC/纳米TiB_2混杂增强铝基复合材料的热压缩试验。利用电子背散射衍射（EBSD）、扫描电镜（SEM）和透射电镜（TEM）对相应的变形组织进行了表征。结果表明，真应力随真应变的增加而迅速增加，达到峰值后趋于稳定或略有下降。峰值应力水平随变形温度的降低和应变速率的增加而增加。混杂复合材料的流变应力行为可用正弦-双曲Arrhenius方程描述，其变形激活能为269.7 kJ/mol。混杂复合材料的主要流动软化机制是动态回复（DRV），并伴有部分动态再结晶（DRX）。特别地，添加TiB 2纳米颗粒促进位错堆积并模拟DRX成核。(C)2018 Elsevier B. V.版权所有。
The hot compression tests of hybrid aluminum-matrix composites reinforced with micro-SiC and nano-TiB2 were performed at deformation temperature of 350-500 degrees C and strain rates of 0.001-1s(-1) on Gleeble-3500 system. The corresponding deformed microstructures were characterized by electron back scattered diffraction (EBSD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results show that the true stress increased rapidly with the increase of the true strain and then stabilized or decreased slightly after the true stress reaches the peak value. The peak stress levels increased with the decrease of deformation temperature and the increase of strain rates. The flow stress behaviors of the hybrid composites can be described by the sine-hyperbolic Arrhenius equation with the deformation activation energy of 269.7 kJ/mol. The main flow softening mechanism of the hybrid composites is dynamic recovery (DRV), accompanied by partial dynamic recrystallization (DRX). In particular, the addition of TiB2 nanoparticles promotes dislocation pile-up and simulates DRX nucleation. (C) 2018 Elsevier B.V. All rights reserved.