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Author:

Liang, S. S. (Liang, S. S..) | Wen, S. P. (Wen, S. P..) | Wu, X. L. (Wu, X. L..) | Huang, H. (Huang, H..) (Scholars:黄晖) | Gao, K. Y. (Gao, K. Y..) (Scholars:高坤元) | Nie, Z. R. (Nie, Z. R..) (Scholars:聂祚仁)

Indexed by:

EI Scopus SCIE

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.

Keyword:

Segregation AlCuMg Precipitate Thermal stability Sc

Author Community:

  • [ 1 ] [Liang, S. S.]Beijing Univ Technol, Sch Mat Sci & Engn, Beijing 100124, Peoples R China
  • [ 2 ] [Wen, S. P.]Beijing Univ Technol, Sch Mat Sci & Engn, Beijing 100124, Peoples R China
  • [ 3 ] [Wu, X. L.]Beijing Univ Technol, Sch Mat Sci & Engn, Beijing 100124, Peoples R China
  • [ 4 ] [Huang, H.]Beijing Univ Technol, Sch Mat Sci & Engn, Beijing 100124, Peoples R China
  • [ 5 ] [Gao, K. Y.]Beijing Univ Technol, Sch Mat Sci & Engn, Beijing 100124, Peoples R China
  • [ 6 ] [Nie, Z. R.]Beijing Univ Technol, Sch Mat Sci & Engn, Beijing 100124, Peoples R China

Reprint Author's Address:

  • [Wen, S. P.]Beijing Univ Technol, Sch Mat Sci & Engn, Beijing 100124, Peoples R China

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Source :

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: 31

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 1

Online/Total:621/5311744
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