期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2018.03.060
关键词
In-situ magnesium matrix composite; Friction stir processing; Microstructural properties; Strengthening mechanism; Tension-compression yield asymmetry
类别
资金
- ICSR-IITM, India [MEE/12-13/584/NFSC/SUSH]
- FIST, Department of Science and Technology, India [SR/FST/ET11-059/2012 (G)]
The application of AZ91 magnesium alloy is limited because of dendritic beta-Mg17Al12 phase which degrades mechanical properties and causes high tension to compression yield asymmetry (R). To overcome this, a severe plastic deformation (SPD) based hybrid process has been implemented in this study, to develop in-situ AZ91 + TiC-TiB2 composite. This results in redistribution of beta-Mg17Al12 phase on the grain boundaries along with notable grain refinement. The combined effect of in-situ reinforcement and grain refinement due to SPD process resulted in simultaneous enhancement of strength and ductility. Further, intense grain refinement and presence of TiC-TiB2 reinforcement in the grain boundary region is found to increase the stress concentration along the grain boundary which hinders twin nucleation and significantly reduces the R value from 1.42 (as-cast condition) to 1.04 (SPDed in-situ composite). The underlying mechanism of significant property enhancement in the developed material has been correlated with the tension and compression tests and microstructures.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据