Curle, Ulyate A2018-01-092018-01-092017-07Curle, U.A. 2017. 3D primary grain shapes resulting from semi-solid metal processing. Proceedings of the 6th Decennial International Conference on Solidification Processing, 25-28 July 2017, Beaumont Estate, Old Windsor, United Kingdom978-1-908549-29-7https://sp17.info/assets/sp17-programme_10.07.17.pdfhttp://hdl.handle.net/10204/9944Paper presented at the 6th Decennial International Conference on Solidification Processing, 25-28 July 2017, Beaumont Estate, Old Windsor, United KingdomThe issue regarding globular grain shape and size has been a topic for semi-solid processing since the discovery of the technique. Semi-solid rheo-processing takes advantage of cooling a liquid metal alloy to the solid + liquid phase field, while it is subjected to some form of turbulence during cooling. It has been suggested that the grains grow into spherical globules by observations of 2D microstructures. It is also known that reducing the melt super-heat has the effect of reducing the globule (grain) size. Are these 2D globules also spherical in shape in 3D or are these 2D shapes remnants of the 3D shapes after sectioning along planes? An Al-Si-Mg alloy is semi-solid processed using a patented processing coil that induces contactless stirring while simultaneously being cooled. Primary aluminium grains are extracted by an etch technique from a sample volume of the casting. The grain size distribution and shapes are analysed. The 3D particles are pictured with scanning electron microscopy. Various interesting particle shapes are observed, from simple to complex. The particle geometry in 3D is compared to 2D optical light microscopy micrographs. It is found that the 2D globules are remnant shapes from the 3D particles after sectioning along random planes.enGrain morphologyGrain sizeMetal processingConference PresentationCurle, U. A. (2017). 3D primary grain shapes resulting from semi-solid metal processing. http://hdl.handle.net/10204/9944Curle, Ulyate A. "3D primary grain shapes resulting from semi-solid metal processing." (2017): http://hdl.handle.net/10204/9944Curle UA, 3D primary grain shapes resulting from semi-solid metal processing; 2017. http://hdl.handle.net/10204/9944 .TY - Conference Presentation AU - Curle, Ulyate A AB - The issue regarding globular grain shape and size has been a topic for semi-solid processing since the discovery of the technique. Semi-solid rheo-processing takes advantage of cooling a liquid metal alloy to the solid + liquid phase field, while it is subjected to some form of turbulence during cooling. It has been suggested that the grains grow into spherical globules by observations of 2D microstructures. It is also known that reducing the melt super-heat has the effect of reducing the globule (grain) size. Are these 2D globules also spherical in shape in 3D or are these 2D shapes remnants of the 3D shapes after sectioning along planes? An Al-Si-Mg alloy is semi-solid processed using a patented processing coil that induces contactless stirring while simultaneously being cooled. Primary aluminium grains are extracted by an etch technique from a sample volume of the casting. The grain size distribution and shapes are analysed. The 3D particles are pictured with scanning electron microscopy. Various interesting particle shapes are observed, from simple to complex. The particle geometry in 3D is compared to 2D optical light microscopy micrographs. It is found that the 2D globules are remnant shapes from the 3D particles after sectioning along random planes. DA - 2017-07 DB - ResearchSpace DP - CSIR KW - Grain morphology KW - Grain size KW - Metal processing LK - https://researchspace.csir.co.za PY - 2017 SM - 978-1-908549-29-7 T1 - 3D primary grain shapes resulting from semi-solid metal processing TI - 3D primary grain shapes resulting from semi-solid metal processing UR - http://hdl.handle.net/10204/9944 ER -