Results 151 to 160 of about 811,199 (195)
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2021
New results on grain refinement of aluminium are presented by using the efficiency concept, which is a powerful tool to compare the nucleation efficiency of different grain refiners. This involves the calculation of nucleation sites per unit volume, which gives much more information about nucleation than intercept grain size.
Rein Vainik, John Courtenay, Frode Lien
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New results on grain refinement of aluminium are presented by using the efficiency concept, which is a powerful tool to compare the nucleation efficiency of different grain refiners. This involves the calculation of nucleation sites per unit volume, which gives much more information about nucleation than intercept grain size.
Rein Vainik, John Courtenay, Frode Lien
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2016
Grain formation during solidification of magnesium and Mg-AI alloys has been studied with a focus on grain refinement mechanisms, solute and particle effects. The variation in grain size with increased aluminium content in hypoeutectic Mg-AI alloys showed a continuous decrease in grain size up to 5 wt% Al.
Lee, Y. C., Dahle, A. K., St John, D. H.
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Grain formation during solidification of magnesium and Mg-AI alloys has been studied with a focus on grain refinement mechanisms, solute and particle effects. The variation in grain size with increased aluminium content in hypoeutectic Mg-AI alloys showed a continuous decrease in grain size up to 5 wt% Al.
Lee, Y. C., Dahle, A. K., St John, D. H.
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Mechanism of High Grain Refinement Effectiveness on New Grain Refiner “TiBAl Advance”
2021Grain refiners are used in the aluminum DC casting process to refine the cast structure. On the other hand, high levels of TiB2 particles and other inclusions from the grain refiner can cause clogging of the melt filter. Improvement of the grain refinement effectiveness is required in order to reduce the addition level of grain refiners.
Akihiro Minagawa, Matthew Piper
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Whole grains, refined grains and fortified refined grains: What’s the difference?
Asia Pacific Journal of Clinical Nutrition, 2000Dietary guidance universally supports the importance of grains in the diet. The United States Department of Agriculture pyramid suggests that Americans consume from six to 11 servings of grains per day, with three of these servings being whole grain products. Whole grain contains the bran, germ and endosperm, while refined grain includes only endosperm.
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Nucleation and Grain Refinement
Materials Science Forum, 2010The nucleation dynamics and grain refinement during solidification are reviewed. Control of the nucleation of phases is an essential step in the manufacture of optimized materials. Development of inoculants is still based on trial-and-error. Using aluminium as an example, it is shown that there is much room for significant improvements.
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Materials Science Forum, 2014
Recently significant successes have been achieved in the field of grain refinement by means of such additives as the titanium, zirconium, scandium, AlTiB and AlTiC. However, introduction of grain refining additives results to a number of negative effects. These effects can be divided into four basic groups: 1.
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Recently significant successes have been achieved in the field of grain refinement by means of such additives as the titanium, zirconium, scandium, AlTiB and AlTiC. However, introduction of grain refining additives results to a number of negative effects. These effects can be divided into four basic groups: 1.
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JOM, 1963
The possible advantages and mechanisms of obtaining grain refinement in carbon, low-, and high-alloy steels are reviewed. The role of vibration and the addition of materials to provide heterogeneous nuclei formation and grain growth inhibition are discussed. The effect of composition on the solidification of steels is described.
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The possible advantages and mechanisms of obtaining grain refinement in carbon, low-, and high-alloy steels are reviewed. The role of vibration and the addition of materials to provide heterogeneous nuclei formation and grain growth inhibition are discussed. The effect of composition on the solidification of steels is described.
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Optimisation of Grain Refinement
2016Considerable progress has been made in recent years with the optimisation of grain refinement practice. In the past this could only be done by trial and error which is time consuming and far from ideal. More recently it has been possible to study and quantify the various factors affecting grain refinement including melt nucleation level, growth ...
Rein Vainik +2 more
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Effect of La on Microstructure and Grain-Refining Performance of Al-Ti-C Grain Refiner
Journal of Rare Earths, 2006Abstract Al-Ti-C grain refiner was prepared by SHS (self-propagating high-temperature synthesis)-melting technique. The effect of La on the microstructures of grain refiner was studied by OM, TEM, SEM, XRD, and EDS. The experimental results indicate that La can improve the wettability between liquid aluminum and graphite; the addition of La results ...
Chunxiang Xu +4 more
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3DXRD: Grain Maps, Grain Dynamics and Grain Refinements
Crystallography Reviews, 2004The three-dimensional X-ray diffraction (3DXRD) method is reviewed. The method is based on the use of high-energy X-rays from synchrotron sources and a ‘tomographic’ approach to diffraction. With 3DXRD the structure of the embedded grains within polycrystals or powders can be characterised non-destructively within millimetre to centimetre size ...
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