Influence of aging treatment on the microstructure, mechanical properties and corrosion behavior of spray deposited Al-Mg-Li-Sc-Zr alloy

被引：12
作者：
Kuang, Quanbo [1 ]
Wang, Richu [1 ,2 ]
Peng, Chaoqun [1 ]
Cai, Zhiyong [1 ,2 ]
Feng, Yan [1 ]
Wang, Xiaofeng [1 ]
机构：
[1] Cent South Univ, Sch Mat Sci & Engn, Changsha 410083, Peoples R China
[2] Cent South Univ, Natl Key Lab Sci & Technol Natl Def High Strength, Changsha 410083, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2021年 / 881卷
基金：
中国国家自然科学基金; 中国博士后科学基金;
关键词：
Al-Mg-Li alloy; Aging; Strengthening mechanism; Corrosion; Electrochemical impedance spectroscopy; EXFOLIATION CORROSION; PHASE-COMPOSITION; EVOLUTION; LITHIUM; MICROHARDNESS; DEFORMATION; STABILITY; DUCTILITY; STRENGTH; FRACTURE;
D O I：
10.1016/j.jallcom.2021.160664
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：
Correlation among microstructural, strengthen mechanism, corrosion resistance, and aging treatment of a lightweight Al-5.45Mg-1.86Li-0.38Sc-0.12Zr alloy fabricated by spray deposition and hot extrusion were investigated. The results revealed that Al3Li and S1 (Al2MgLi) were the main precipitated phases in the alloy after solution and aging treatments. The increase of aging time from 12 h to 20 h at 120 degrees C significantly improved the alloy strength due to the fine and homogeneously dispersed Al3Li precipitates. With further prolonging the aging time from 20 h to 35 h, dislocation bypasses the Al3Li precipitates by the Orowan mechanism, and the S1 phases located at the grain boundaries undermine the continuity of the grain boundary. This led to a decrease in the mechanical properties and corrosion resistant of the alloy. The high corrosion susceptibility from prolonging the aging time is caused by the coarsening of S1 precipitates. (c) 2021 Elsevier B.V. All rights reserved.
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页数：12
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