Effect of hot extrusion on microstructural evolution and tensile properties of Al-15%Mg2Si-xGd in-situ composites
This study investigates the effect of hot extrusion on microstructure and tensile properties of Al–15 wt %Mg2Si in-situ composite in unmodified and modified with (0.5–5.0 wt %) Gd addition. Furthermore, the morphology evolution of primary and eutectic Mg2Si particles in both unmodified and modified...
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| Format: | Article |
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Elsevier Ltd
2018
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| _version_ | 1796863992239489024 |
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| author | Ghandvar, Hamidreza Idris, Mohd. Hasbullah Ahmad, Norhayati |
| author_facet | Ghandvar, Hamidreza Idris, Mohd. Hasbullah Ahmad, Norhayati |
| author_sort | Ghandvar, Hamidreza |
| collection | ePrints |
| description | This study investigates the effect of hot extrusion on microstructure and tensile properties of Al–15 wt %Mg2Si in-situ composite in unmodified and modified with (0.5–5.0 wt %) Gd addition. Furthermore, the morphology evolution of primary and eutectic Mg2Si particles in both unmodified and modified with 1.0 wt % Gd prepared by hot extrusion were examined in detail. The results showed that hot-extrusion process was efficient in transforming truncated octahedral primary and rod-like eutectic Mg2Si particles into near spherical and dot-like morphology, respectively in the modified alloy in which the particle fragmentation and thermal disintegration are the main mechanisms responsible for refinement/modification of primary and eutectic Mg2Si particles. It was suggested that the alteration of Mg2Si particles as well as fragmentation of Gd intermetallic compounds (IMCs) by hot extrusion played a significant role in strengthening the composite, i.e., the ultimate tensile strength (UTS) and elongation (%) values increased from ∼224.62 MPa to 3.75% in the 1.0 wt % modified composite to ∼245.83 MPa and 7.65% in the extruded modified one, respectively. In fact, a higher fracture stress can be established by fine near spherical primary Mg2Si particles through impeding dislocation motions and freeing stress concentrations. Furthermore, fragmentation of eutectic Mg2Si and Gd (IMCs) after extrusion lead to enhancement in ductility. This study demonstrated that combination of Gd addition and hot extrusion is a promising approach in modifying the microstructure and enhancing the tensile properties of in-situ Al-15%Mg2Si composite for industrial applications. |
| first_indexed | 2024-03-05T20:35:08Z |
| format | Article |
| id | utm.eprints-85173 |
| institution | Universiti Teknologi Malaysia - ePrints |
| last_indexed | 2024-03-05T20:35:08Z |
| publishDate | 2018 |
| publisher | Elsevier Ltd |
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| spelling | utm.eprints-851732020-03-04T01:31:18Z http://eprints.utm.my/85173/ Effect of hot extrusion on microstructural evolution and tensile properties of Al-15%Mg2Si-xGd in-situ composites Ghandvar, Hamidreza Idris, Mohd. Hasbullah Ahmad, Norhayati TJ Mechanical engineering and machinery This study investigates the effect of hot extrusion on microstructure and tensile properties of Al–15 wt %Mg2Si in-situ composite in unmodified and modified with (0.5–5.0 wt %) Gd addition. Furthermore, the morphology evolution of primary and eutectic Mg2Si particles in both unmodified and modified with 1.0 wt % Gd prepared by hot extrusion were examined in detail. The results showed that hot-extrusion process was efficient in transforming truncated octahedral primary and rod-like eutectic Mg2Si particles into near spherical and dot-like morphology, respectively in the modified alloy in which the particle fragmentation and thermal disintegration are the main mechanisms responsible for refinement/modification of primary and eutectic Mg2Si particles. It was suggested that the alteration of Mg2Si particles as well as fragmentation of Gd intermetallic compounds (IMCs) by hot extrusion played a significant role in strengthening the composite, i.e., the ultimate tensile strength (UTS) and elongation (%) values increased from ∼224.62 MPa to 3.75% in the 1.0 wt % modified composite to ∼245.83 MPa and 7.65% in the extruded modified one, respectively. In fact, a higher fracture stress can be established by fine near spherical primary Mg2Si particles through impeding dislocation motions and freeing stress concentrations. Furthermore, fragmentation of eutectic Mg2Si and Gd (IMCs) after extrusion lead to enhancement in ductility. This study demonstrated that combination of Gd addition and hot extrusion is a promising approach in modifying the microstructure and enhancing the tensile properties of in-situ Al-15%Mg2Si composite for industrial applications. Elsevier Ltd 2018-06 Article PeerReviewed Ghandvar, Hamidreza and Idris, Mohd. Hasbullah and Ahmad, Norhayati (2018) Effect of hot extrusion on microstructural evolution and tensile properties of Al-15%Mg2Si-xGd in-situ composites. Journal of Alloys and Compounds, 751 . pp. 370-390. ISSN 0925-8388 http://dx.doi.org/10.1016/j.jallcom.2018.04.131 |
| spellingShingle | TJ Mechanical engineering and machinery Ghandvar, Hamidreza Idris, Mohd. Hasbullah Ahmad, Norhayati Effect of hot extrusion on microstructural evolution and tensile properties of Al-15%Mg2Si-xGd in-situ composites |
| title | Effect of hot extrusion on microstructural evolution and tensile properties of Al-15%Mg2Si-xGd in-situ composites |
| title_full | Effect of hot extrusion on microstructural evolution and tensile properties of Al-15%Mg2Si-xGd in-situ composites |
| title_fullStr | Effect of hot extrusion on microstructural evolution and tensile properties of Al-15%Mg2Si-xGd in-situ composites |
| title_full_unstemmed | Effect of hot extrusion on microstructural evolution and tensile properties of Al-15%Mg2Si-xGd in-situ composites |
| title_short | Effect of hot extrusion on microstructural evolution and tensile properties of Al-15%Mg2Si-xGd in-situ composites |
| title_sort | effect of hot extrusion on microstructural evolution and tensile properties of al 15 mg2si xgd in situ composites |
| topic | TJ Mechanical engineering and machinery |
| work_keys_str_mv | AT ghandvarhamidreza effectofhotextrusiononmicrostructuralevolutionandtensilepropertiesofal15mg2sixgdinsitucomposites AT idrismohdhasbullah effectofhotextrusiononmicrostructuralevolutionandtensilepropertiesofal15mg2sixgdinsitucomposites AT ahmadnorhayati effectofhotextrusiononmicrostructuralevolutionandtensilepropertiesofal15mg2sixgdinsitucomposites |