Abstract
In this study, the effect of Sc addition on the microstructure and mechanical properties of Al-20Si alloys fabricated by extrusion of powders was investigated. The Al-Si-(Sc) powders produced by high pressure gas atomization were used in starting materials. The microstructure and structural characterization were performed by optical microscopy (OM), X-ray diffractometry (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) with an energy dispersive X-ray spectroscopy (EDS). Mechanical properties of extruded bars were investigated by micro hardness test, tensile test and wear test. With increasing the Sc contents in Al-Si alloys, mechanical properties were significantly increased. These enhanced mechanical properties can be explained based on the refinement of primary Si due to the suppression of growth of primary Si by the well-surrounded and uniformly distributed Sc.
Keywords: Al-Si Alloys powder technology, gas atomizer, hypereutectic, scandium, Si particle.
Current Nanoscience
Title:The Effect of Sc on the Microstructure and Mechanical Properties of Hypereutectic Al-Si Alloy Fabricated by a Gas Atomization Process
Volume: 10 Issue: 1
Author(s): Tae-Haeng Lee, Han-Jin Ko, Tae-Sik Jeong and Soon-Jik Hong
Affiliation:
Keywords: Al-Si Alloys powder technology, gas atomizer, hypereutectic, scandium, Si particle.
Abstract: In this study, the effect of Sc addition on the microstructure and mechanical properties of Al-20Si alloys fabricated by extrusion of powders was investigated. The Al-Si-(Sc) powders produced by high pressure gas atomization were used in starting materials. The microstructure and structural characterization were performed by optical microscopy (OM), X-ray diffractometry (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) with an energy dispersive X-ray spectroscopy (EDS). Mechanical properties of extruded bars were investigated by micro hardness test, tensile test and wear test. With increasing the Sc contents in Al-Si alloys, mechanical properties were significantly increased. These enhanced mechanical properties can be explained based on the refinement of primary Si due to the suppression of growth of primary Si by the well-surrounded and uniformly distributed Sc.
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Cite this article as:
Lee Tae-Haeng, Ko Han-Jin, Jeong Tae-Sik and Hong Soon-Jik, The Effect of Sc on the Microstructure and Mechanical Properties of Hypereutectic Al-Si Alloy Fabricated by a Gas Atomization Process, Current Nanoscience 2014; 10 (1) . https://dx.doi.org/10.2174/1573413709666131109004559
DOI https://dx.doi.org/10.2174/1573413709666131109004559 |
Print ISSN 1573-4137 |
Publisher Name Bentham Science Publisher |
Online ISSN 1875-6786 |
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