Mechanical Properties of Commercial Purity Aluminum Modified by Zirconium Micro-Additives
The mechanical properties and the fractured surfaces of commercial purity aluminum modified by zirconium micro-additives were investigated by means of experimental examination. A commercial purity Al specimen was used as a reference material and seven Al-Zr alloys in the 0.02–0.14 wt.% Zr compositio...
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MDPI AG
2021-03-01
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| Series: | Crystals |
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| Online Access: | https://www.mdpi.com/2073-4352/11/3/270 |
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| author | Ahmad Mostafa Wail Adaileh Alaa Awad Adnan Kilani |
| author_facet | Ahmad Mostafa Wail Adaileh Alaa Awad Adnan Kilani |
| author_sort | Ahmad Mostafa |
| collection | DOAJ |
| description | The mechanical properties and the fractured surfaces of commercial purity aluminum modified by zirconium micro-additives were investigated by means of experimental examination. A commercial purity Al specimen was used as a reference material and seven Al-Zr alloys in the 0.02–0.14 wt.% Zr composition range (with 0.02 wt.% Zr step) were prepared by microalloying methods. Optical microscopy was used to examine the microstructures and to calculate the grain sizes of the prepared specimens. The phase assemblage diagrams were plotted and the relative amounts of solid phases were calculated at room temperature using FactSage thermochemical software and databases. Proof stress, strength coefficient and strain hardening exponent were measured from the stress-strain curves obtained from tensile experiments and Charpy impact energy was calculated for all specimens. The experiments showed that the grain size of commercial purity Al was reduced by adding any Zr concentration in the investigated composition range, which could be due to the nucleation of new grains at Al<sub>3</sub>Zr particle sites. Accordingly, the microhardness number, tensile properties and Charpy impact energy were improved, owing to the large grain-boundary areas resulted from the refining effect of Zr, which can limit the movement of dislocations in the refined samples. The basic fracture mode in all specimens was ductile, because Al has an FCC structure and remains ductile even at low temperatures. The ductile fractures took place in a transgranular manner as could be concluded from the fractured surface features, which include voids, ridges and cavitation. |
| first_indexed | 2024-03-10T13:23:59Z |
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| id | doaj.art-3a3f5fb0ff254cd1a2b254befc4df487 |
| institution | Directory Open Access Journal |
| issn | 2073-4352 |
| language | English |
| last_indexed | 2024-03-10T13:23:59Z |
| publishDate | 2021-03-01 |
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| spelling | doaj.art-3a3f5fb0ff254cd1a2b254befc4df4872023-11-21T09:45:35ZengMDPI AGCrystals2073-43522021-03-0111327010.3390/cryst11030270Mechanical Properties of Commercial Purity Aluminum Modified by Zirconium Micro-AdditivesAhmad Mostafa0Wail Adaileh1Alaa Awad2Adnan Kilani3Department of Mechanical Engineering, Tafila Technical University, Tafila 66110, JordanDepartment of Mechanical Engineering, Tafila Technical University, Tafila 66110, JordanDepartment of Industrial Engineering, University of Jordan, Amman 11942, JordanDepartment of Industrial Engineering, University of Jordan, Amman 11942, JordanThe mechanical properties and the fractured surfaces of commercial purity aluminum modified by zirconium micro-additives were investigated by means of experimental examination. A commercial purity Al specimen was used as a reference material and seven Al-Zr alloys in the 0.02–0.14 wt.% Zr composition range (with 0.02 wt.% Zr step) were prepared by microalloying methods. Optical microscopy was used to examine the microstructures and to calculate the grain sizes of the prepared specimens. The phase assemblage diagrams were plotted and the relative amounts of solid phases were calculated at room temperature using FactSage thermochemical software and databases. Proof stress, strength coefficient and strain hardening exponent were measured from the stress-strain curves obtained from tensile experiments and Charpy impact energy was calculated for all specimens. The experiments showed that the grain size of commercial purity Al was reduced by adding any Zr concentration in the investigated composition range, which could be due to the nucleation of new grains at Al<sub>3</sub>Zr particle sites. Accordingly, the microhardness number, tensile properties and Charpy impact energy were improved, owing to the large grain-boundary areas resulted from the refining effect of Zr, which can limit the movement of dislocations in the refined samples. The basic fracture mode in all specimens was ductile, because Al has an FCC structure and remains ductile even at low temperatures. The ductile fractures took place in a transgranular manner as could be concluded from the fractured surface features, which include voids, ridges and cavitation.https://www.mdpi.com/2073-4352/11/3/270grain refinementmechanical propertiescommercial purity aluminumzirconium |
| spellingShingle | Ahmad Mostafa Wail Adaileh Alaa Awad Adnan Kilani Mechanical Properties of Commercial Purity Aluminum Modified by Zirconium Micro-Additives Crystals grain refinement mechanical properties commercial purity aluminum zirconium |
| title | Mechanical Properties of Commercial Purity Aluminum Modified by Zirconium Micro-Additives |
| title_full | Mechanical Properties of Commercial Purity Aluminum Modified by Zirconium Micro-Additives |
| title_fullStr | Mechanical Properties of Commercial Purity Aluminum Modified by Zirconium Micro-Additives |
| title_full_unstemmed | Mechanical Properties of Commercial Purity Aluminum Modified by Zirconium Micro-Additives |
| title_short | Mechanical Properties of Commercial Purity Aluminum Modified by Zirconium Micro-Additives |
| title_sort | mechanical properties of commercial purity aluminum modified by zirconium micro additives |
| topic | grain refinement mechanical properties commercial purity aluminum zirconium |
| url | https://www.mdpi.com/2073-4352/11/3/270 |
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