Effects of Beryllium Addition on Microstructure, Mechanical and Corrosion Performance of Al-Mg-Li Alloys

The Al-Mg-Li alloy is ideal for ultra-lightweight aircraft components, and its further performance improvement is of great interest in the aerospace industry. In this study, the effects of various beryllium (Be) additions (Be-free, 0.1, 0.25, 0.50 wt.%) on the microstructure, mechanical, and corrosi...

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Published inMaterials Vol. 16; no. 18; p. 6308
Main Authors Huang, Yang, Li, Weiwei, Wu, Mingdong, Xiao, Daihong, Huang, Lanping, Liu, Wensheng
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.09.2023
MDPI
Subjects
Aerospace industry
Aging
Aircraft components
Al-Mg-Li alloy
Alloying elements
Alloys
Aluminum base alloys
Analysis
Beryllium
beryllium content
Casting alloys
corrosion
Corrosion and anti-corrosives
Corrosion effects
Corrosion prevention
Corrosion tests
Elongation
Grain boundaries
Grain refinement
Ingot casting
Lithium
Magnesium
Mechanical properties
Microscopy
Microstructure
Precipitates
Recrystallization
Specialty metals industry
Ultimate tensile strength
Yield strength
China
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Summary:The Al-Mg-Li alloy is ideal for ultra-lightweight aircraft components, and its further performance improvement is of great interest in the aerospace industry. In this study, the effects of various beryllium (Be) additions (Be-free, 0.1, 0.25, 0.50 wt.%) on the microstructure, mechanical, and corrosion performance of the Al-Mg-Li alloys were systematically investigated. The optimal tensile property was obtained in the alloy which added 0.1 wt.% Be with an ultimate tensile strength (UTS), yield strength (YS), and elongation (El) of 530 MPa, 370 MPa, and 9.2%, respectively. Trace Be addition promotes the grain refinement of the as-cast alloy ingot and contributes positive effects to the recrystallization, bringing improvement of the tensile property. Meanwhile, the best anti-corrosion behavior is also presented at 0.1 wt.% Be is added, due to its potential to reduce the width of precipitates free zone (PFZ). As the Be content increases to an excessive level, the comprehensive performance decreases. Therefore, it is strongly recommended that adding trace Be elements into Al-Mg-Li alloys has a positive effect on the comprehensive service performance.
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ISSN:1996-1944
1996-1944
DOI:10.3390/ma16186308