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Abstract：
The effect of Si and Sc on the evolution of the precipitates during aging in Al4.0Cu0.5 Mg alloys was investigated by means of microhardness tests and transmission electron microscope. The results show that Si can significantly refine the size of theta＇ phases, because addition of Si introduces a considerable amount of small, uniformly dispersed Al-Cu-Mg-Si (Q) quaternary phases, which provides nucleation sites for the theta＇ phases. Sc atoms segregate at the interfaces between the matrix and the theta＇-Al2Cu precipitates in AlCuMgSiSc alloy. The segregation of Sc atoms inhibits the growth of the theta＇ phases and improves the thermal stability of the theta＇ phases. At the same time, the segregation of Sc atoms in Q phases restrains the coarsening of the Q phases, which also contributes to the thermal stability of the theta＇ phases. The co-addition of Si and Sc thus leads to a combination of high strength and high thermal stability of the Al-Cu-Mg-Si-Sc alloy.
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MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
ISSN： 0921-5093
Year： 2020
Volume： 783
6 . 4 0 0
JCR@2022
ESI Discipline： MATERIALS SCIENCE;
ESI HC Threshold：169
Cited Count：
WoS CC Cited Count： 29
SCOPUS Cited Count： 34
ESI Highly Cited Papers on the List： 0 Unfold All
WanFang Cited Count：
Chinese Cited Count：
30 Days PV： 4
