Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 842, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2020.155826
Keywords
Clustering; Aging hardening; Precipitation
Categories
Funding
- 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]
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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.
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