Silicon is reported to reduce the toxic effects of Al on root elongation but the in planta mechanism by which this occurs remains unclear. Using seedlings of soybean (Glycine max) and sorghum (Sorghum bicolor), we examined the effect of up to 2 mM Si on root elongation rate (RER) in Al-toxic nutrient solutions. Synchrotron-based low energy X-ray fluorescence (LEXRF) was then used for the in sit...

Al-5Ti-C master alloy was prepared and used to modify hypereutectic Al-20%Si alloy. The microstructure evolution and mechanical properties of hypereutectic Al-20%Si alloy with Al-5Ti-C master alloy additions (0, 0.4, 0.6, 1.0, 1.6 and 2.0 wt%) were investigated. The results show that, Al-5Ti-C master alloy (0.6 wt%, 10 min) can significantly refine both eutectic and primary Si of hypereutectic ...

The effects of adding 0.02 or 0.06 at.% Si to Al–0.06Sc–0.06Zr (at.%) are studied to determine the impact of Si on accelerating Al3(Sc,Zr) precipitation kinetics in dilute Al–Sc-based alloys. Precipitation in the 0.06 at.% Si alloy, measured by microhardness and atom-probe tomography (APT), is accelerated for aging times <4 h at 275 and 300 C, compared with the 0.02 at.% Si alloy. Experimental ...

In the present work, the room and elevated temperature mechanical behavior of Al/TiC, high-strength Al-Si/TiC and the elevated temperature-resistant Al-Fe(-V-Si)/TiC composites has been evaluated. The microstructural characteristics of ingot metallurgy (IM) or rapid solidification (RS) Al-Si/TiC and Al-Fe(-V-Si)/TiC composites could be thought of as a combination of the related alloy matrix mic...

The solubility of the assemblage corundum + kyanite in H2O was determined at 700 C and 10 kbar, using a piston-cylinder apparatus and rapid-quench/fluid-extraction techniques. Weighted mean concentrations of total Al and Si were 5.80 ± 0.03 mmol kg H2O and 0.308 ± 0.003 mol kg )1 H2O, respectively (1r errors). The Al concentration is nearly five times higher than that of corundum solubility in ...

Modification of primary silicon was studied in Al-Si hypereutectic alloys with 17 Wt % silicon content. The alloys modified through non-conventional method using oxide addition. The effect of oxide on the morphology and size of Si phases in the hypereutectic Al-Si alloys investigated. The results show that the addition of MnO2 to the hypereutectic Al-Si alloys can modify the primary Si phases. ...