期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 842, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2020.155826
关键词
Clustering; Aging hardening; Precipitation
资金
- National Key Research and Development Program of China [2016YFB0300804, 2016YFB0300801]
- National Natural Science Fund for Innovative Research Groups [51621003]
- National Natural Science Foundation of China [51671005, 51701006]
- Beijing Natural Science Foundation [2202009]
The aging hardening behaviors of Al-0.12Sc and Al-0.12Sc-0.2Zr (wt.%) alloys with the addition of Si range from 0.05 wt% to 0.3 wt% were investigated by microhardness and transmission electron microscopy. The results indicate that content of similar to 0.15% Si is optimal and Sc-Si clusters forming at the early ageing stage hinder the evolution process of Al3Sc. Upon aging isochronally, Al-Sc-(Zr)-Si alloy shows two stages hardening. The first strengthen stage occurs because of the formation of Sc-Si clusters, and peak hardness of the second stage owes to (Al,Si)(3)Sc evolving from the clusters. During aging isothermally at 275 degrees C, Al-Sc-Si and Al-Sc-Zr-Si show similar hardening characteristics. But ageing at 225 degrees C, the Sc-Si clusters are relatively stable, the second stage increase in the Al-Sc-(0.15, 0.3%)Si alloys have no appearance. Clustering behavior of Sc and Si does not be changed by the addition of Zr. The Al-Sc-Zr-Si alloy exhibits better thermal stability. Because partition of Zr to the preceding formed (Al,Si)(3)Sc reduces the coarsening rate of the precipitates. (C) 2020 Elsevier B.V. All rights reserved.
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