Microstructures and mechanical properties of the Al-Cu-Sc alloys prepared by ultrasound-assisted molten salt electrolysis

被引：9
|
作者：
Liu, Xuan [1 ]
Guo, Zhichao [1 ]
Xue, Jilai [1 ]
Zhu, Changwei [1 ]
Zhang, Pengju [1 ]
Li, Xiang [2 ]
机构：
[1] Univ Sci & Technol Beijing, Sch Met & Ecol Engn, Beijing 100083, Peoples R China
[2] Univ Sci & Technol Beijing, State Key Lab Adv Met, Beijing 100083, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2020年 / 818卷
基金：
中国国家自然科学基金; 北京市自然科学基金;
关键词：
Al alloys; Microstructure; Ultrasound; Mechanical properties; Solidification; Electrolysis; MINOR SC; EVOLUTION; SCANDIUM; PHASE;
D O I：
10.1016/j.jallcom.2019.152870
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
An Al-4Cu-Sc alloy bearing the strengthening ternary W- (Al, Cu, Sc) phase has been successfully prepared by molten salt electrolysis (MSE) assisted by ultrasound. Modification of the morphology at W(Al, Cu, Sc) ternary phase and mechanical properties of the Al-4Cu-Sc alloy are comprehensively studied in this work. Without the presence of ultrasound, a quantity of large-clustered eutectic W-phase precipitate around grain boundaries, accompanied by a small amount of bulk peritectic W-phase nucleating on the substrate of pre-existed Al3Sc. Both the eutectic and peritectic W-phase get significant refinement and dispersion in the presence of ultrasound. The size of W-phase cluster reduces from length similar to 150 mu m and width similar to 30 mu m down to diameter about 30 mu m. The refining mechanism of W-phase should be attributed to the enhanced nucleation rate for pre-existed Al3Sc as well as the uniform distribution of solute in the presence of ultrasound. The values of Vickers hardness and yield strength of the alloy prepared by synergetic ultrasound assisted electrolysis and solidification process are about 68 H V and 157 MPa, approximately 36% and 67% higher than those of the MSE alloy. It should be due to the ultrasound-enhanced refinement and dispersion of fine W-phase, serving as strengthening phase. (C) 2019 Elsevier B.V. All rights reserved.
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页数：8
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