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Ultrafine-grained Al-Mg-Zr alloy processed by shear-assisted extrusion with high thermal stability
- Source :
- Scripta Materialia. 186:326-330
- Publication Year :
- 2020
- Publisher :
- Elsevier BV, 2020.
-
Abstract
- Shear-assisted processing and extrusion (ShAPE) is used to consolidate Al-4.2Mg-1.6Zr-0.25Si-0.1Fe (wt.%) powders. The extruded alloy exhibits: (i) near-zero porosity; (ii) an attractive combination of tensile yield strength (~220 MPa), ultimate strength (330 MPa) and elongation (>20%); and (iii) excellent thermal stability at 400 °C. The ultra-fine grain size in the gas-atomized powders – created and stabilized by primary L12-Al3Zr submicron precipitates - is maintained after consolidation and subsequent exposure at 400 °C, contributing twice as much to strength as Mg in solid-solution. Electron microscopy reveals the microstructure of the L12-Al3Zr precipitates, and other precipitates (Mg2Si and Al3Fe) and dispersoids (oxides).
- Subjects :
- 010302 applied physics
Materials science
Mechanical Engineering
Alloy
Metals and Alloys
02 engineering and technology
engineering.material
021001 nanoscience & nanotechnology
Condensed Matter Physics
Microstructure
01 natural sciences
Grain size
Mechanics of Materials
0103 physical sciences
Ultimate tensile strength
engineering
General Materials Science
Extrusion
Thermal stability
Elongation
Composite material
0210 nano-technology
Porosity
Subjects
Details
- ISSN :
- 13596462
- Volume :
- 186
- Database :
- OpenAIRE
- Journal :
- Scripta Materialia
- Accession number :
- edsair.doi...........99608ec1f31f4b80f458df7aa34cb70c