A New Extruded Mg-6Bi-3Al-1Zn Alloy with Excellent Tensile Properties

Aiming to develop low-cost Mg alloys with good mechanical properties, a new Mg-6Bi-3Al-1Zn (wt.%, BAZ631) alloy having a high ultimate tensile strength of ~402 MPa and an elongation of ~15% was fabricated by single pass extrusion. The as-extruded BAZ631 alloy demonstrates an almost fully dynamic rec...

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Bibliographic Details
Published inMetals (Basel ) Vol. 12; no. 7; p. 1159
Main Authors Meng, Shuaiju, Xiao, Haoran, Luo, Zhanju, Zhang, Mingchi, Jiang, Runlin, Cheng, Xueqi, Yu, Haicun
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.07.2022
Subjects
Alloy development
Alloying elements
Alloys
Ductility
dynamic recrystallization
Elongation
Extrusion
Grain boundaries
Grain size
Homogenization
Industrial applications
Intermetallic compounds
Magnesium base alloys
Mechanical properties
Mg alloy
Microstructure
Precipitates
Precipitation hardening
Rare earth elements
Scanning electron microscopy
Solid solutions
Solution strengthening
Spectrum analysis
Tensile properties
Ultimate tensile strength
China
Japan
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Summary:Aiming to develop low-cost Mg alloys with good mechanical properties, a new Mg-6Bi-3Al-1Zn (wt.%, BAZ631) alloy having a high ultimate tensile strength of ~402 MPa and an elongation of ~15% was fabricated by single pass extrusion. The as-extruded BAZ631 alloy demonstrates an almost fully dynamic recrystallized microstructure with an average grain size of ~2.9 μm. Moreover, both nano-scale Mg3Bi2 and Mg17Al12 precipitates were found dispersed in the matrix. These excellent mechanical properties are attributed to the combined effects of grain boundary strengthening, dispersion and precipitation strengthening induced by both micro and nanoscale second phase particles, and solid-solution strengthening. This high strength and good ductile Mg-Bi based alloy without rare-earth elements addition is expected to inspire a new alloy design strategy for fabricating high performance Mg products for larger-scale industrial applications.
ISSN:2075-4701
2075-4701
DOI:10.3390/met12071159