Modeling of the mechanical responses of nanocrystalline metals and alloys
- Sanusi, K. O., Afolabi, A. S., Muzenda, E., Akinlabi, Esther Titilayo
- Authors: Sanusi, K. O. , Afolabi, A. S. , Muzenda, E. , Akinlabi, Esther Titilayo
- Date: 2015-07-01
- Subjects: Nanocrystalline materials , Hall-Petch relations , Nanocrystalline alloys
- Type: Article
- Identifier: http://ujcontent.uj.ac.za8080/10210/390253 , uj:5122 , ISBN 9789881404701 , http://hdl.handle.net/10210/14083
- Description: This paper reports the proposed model of the flow behaviors of nanocrystalline metals and alloys deformed at different strains, strain rates and temperatures. It incorporated the effect of grain size, high internal stresses and lattice distortions existing near boundaries to the Hall-Petch relations. The developed model was compared to that of Khan-Huang-Liang and found to be more reliable in clarifying the inverse Hall-Petch relation. Using the new proposed constitutive model, the mechanical behaviour of materials at different grain sizes for ultrafine grained to nanostructure materials at different temperatures and strain rates can be obtained. The model is also useful in predicting the response of nanocrystalline metals and alloys during the forming process.
- Full Text:
- Authors: Sanusi, K. O. , Afolabi, A. S. , Muzenda, E. , Akinlabi, Esther Titilayo
- Date: 2015-07-01
- Subjects: Nanocrystalline materials , Hall-Petch relations , Nanocrystalline alloys
- Type: Article
- Identifier: http://ujcontent.uj.ac.za8080/10210/390253 , uj:5122 , ISBN 9789881404701 , http://hdl.handle.net/10210/14083
- Description: This paper reports the proposed model of the flow behaviors of nanocrystalline metals and alloys deformed at different strains, strain rates and temperatures. It incorporated the effect of grain size, high internal stresses and lattice distortions existing near boundaries to the Hall-Petch relations. The developed model was compared to that of Khan-Huang-Liang and found to be more reliable in clarifying the inverse Hall-Petch relation. Using the new proposed constitutive model, the mechanical behaviour of materials at different grain sizes for ultrafine grained to nanostructure materials at different temperatures and strain rates can be obtained. The model is also useful in predicting the response of nanocrystalline metals and alloys during the forming process.
- Full Text:
Material characterization of dissimilar friction stir spot welded Aluminium and Copper alloy
- Sanusi, K. O., Akinlabi, Esther Titilayo
- Authors: Sanusi, K. O. , Akinlabi, Esther Titilayo
- Date: 2017
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/243829 , uj:25206 , Citation: Sanusi, K. O. & Akinlabi, E.T. 2017. Material characterization of dissimilar friction stir spot welded Aluminium and Copper alloy.
- Description: Abstract: In this research study, material characterization of dissimilar friction stir spot welded Aluminium and Copper was evaluated. Rotational speeds of 800 rpm and transverse speeds of 50 mm/min, 150 mm/min and 250 mm/min were used. The total numbers of samples evaluated were nine altogether. The spot welds were characterised by microstructure characterization using optical microscope (OEM) and scanning electron microscopy technique (SEM) by observing the evolution of the microstructure across the weld’s cross-section. lap-shear test of the of the spot weld specimens were also done. From the results, it shows that welding of metals and alloys using Friction stir spot welding is appropriate and can be use in industrial applications.
- Full Text:
- Authors: Sanusi, K. O. , Akinlabi, Esther Titilayo
- Date: 2017
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/243829 , uj:25206 , Citation: Sanusi, K. O. & Akinlabi, E.T. 2017. Material characterization of dissimilar friction stir spot welded Aluminium and Copper alloy.
- Description: Abstract: In this research study, material characterization of dissimilar friction stir spot welded Aluminium and Copper was evaluated. Rotational speeds of 800 rpm and transverse speeds of 50 mm/min, 150 mm/min and 250 mm/min were used. The total numbers of samples evaluated were nine altogether. The spot welds were characterised by microstructure characterization using optical microscope (OEM) and scanning electron microscopy technique (SEM) by observing the evolution of the microstructure across the weld’s cross-section. lap-shear test of the of the spot weld specimens were also done. From the results, it shows that welding of metals and alloys using Friction stir spot welding is appropriate and can be use in industrial applications.
- Full Text:
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