|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Mechanical Behavior of Nanostructured Materials
||L-154: The Precipitation and Strengthening Behavior of Ultrafine Structured Al-7wt%Si-0.3wt%Mg Alloy
||Jiamiao Liang, Zhen Zhang, Xun Yao, Yifeng Zheng, Deliang Zhang
|On-Site Speaker (Planned)
The precipitation and strengthening behavior of ultrafine structuredAl-7Si-0.3Mg (wt%) alloy were investigated. The needle shaped precipitates with length of 5-20 nm were detected in T5 and T6 heat treated samples. The slight grain coarsening in ultrafine grained Al-7Si-0.3Mg alloy after T6 heat treatment shows a good microstructure stability which is mainly attributed to the pinning of silicon particles and Al3FeSi particles to grain boundaries. Following T6 heat treatment, the ultrafine grained Al-7Si-0.3Mg alloy shows improved ductility due to the decrease of dislocation density and the increase of grain size caused by T6 heat treatment. With the same T6 heat treatment process, ultrafine grain Al-7Si-0.3Mg alloy exhibit better YS and UTS than coarse grained counterpart due to its fine grain size which produces more grain boundary strengthening. Significant precipitation strengthening behavior is observed in ultrafine grained Al-7Si-0.3Mg alloy after T5 heat treatment, and the strengthening mechanism is correlated to its microstructure.
||Planned: Supplemental Proceedings volume