The Effects of Multi-Stage Homogenizations on the Microstructures and Mechanical Properties of Al–Zn–Mg–Zr–Sc Alloys

Autor: Jun Wei Zhang, Sheng Long Lee, Mien Chung Chen, Yang Chun Chiu, Hui Yun Bor, Tse An Pan
Rok vydání: 2021
Předmět:
Materials science
Recrystallization (geology)
Scanning electron microscope
Alloy
scandium
zirconium
02 engineering and technology
engineering.material
lcsh:Technology
01 natural sciences
Homogenization (chemistry)
law.invention
lcsh:Chemistry
Differential scanning calorimetry
multi-stage homogenizations
Optical microscope
law
0103 physical sciences
General Materials Science
Composite material
lcsh:QH301-705.5
Instrumentation
010302 applied physics
Fluid Flow and Transfer Processes
lcsh:T
Process Chemistry and Technology
General Engineering
Al–Zn–Mg alloy
recrystallized microstructures
021001 nanoscience & nanotechnology
Microstructure
lcsh:QC1-999
Computer Science Applications
lcsh:Biology (General)
lcsh:QD1-999
lcsh:TA1-2040
engineering
lcsh:Engineering (General). Civil engineering (General)
0210 nano-technology
lcsh:Physics
Electron backscatter diffraction
Zdroj: Applied Sciences, Vol 11, Iss 470, p 470 (2021)
Applied Sciences
Volume 11
Issue 2
ISSN: 2076-3417
DOI: 10.3390/app11020470
Popis: This study is aimed at exploring the effects of multi-stage homogenization and trace amounts of Zr and Sc on the microstructures, mechanical properties, and recrystallization of Al&ndash
4.5Zn&ndash
1.5Mg alloys. The mechanical properties of the AA7005 aluminum alloys after the T6 heat treatment were evaluated through a hardness test and tensile test. The microstructures were analyzed by an optical microscope (OM), a differential scanning calorimeter (DSC), a transmission electron microscope (TEM), a scanning electron microscope (SEM), and electron backscattered diffraction (EBSD). The results show that the grain refinement effect of the as-cast, homogenized, and recrystallized Al&ndash
1.5Mg alloy containing 0.05Sc (wt%) after the T6 heat treatment was more significant than that of the alloy containing 0.1Zr (wt%). In addition, compared with the aforementioned one-stage homogenization heat treatment, the two-stage homogenization made the dispersed grain phase (Al3Zr/Al3Sc) smaller. As a result, the T6 mechanical strength of the alloy after the two-stage homogenization heat treatment was better than that of the contrastive alloy after the one-stage homogenization heat treatment. However, the two different homogenization heat treatments caused a greater divergence between the sizes of the dispersed grain phases of the Al&ndash
1.5Mg alloys containing Zr than between the sizes of the dispersed grain phases of the alloys containing Sc. Therefore, after the two-stage homogenization heat treatment, the alloy with 0.1Zr (wt%) promoted the mechanical properties better than the alloy with 0.05Sc (wt%).
Databáze: OpenAIRE
Externí odkaz: