Optimizing the Melt Treatment of Piston Alloys Using Thermal Analysis Technique

Effects of grain refining and modification on the microstructural evolution of semi-solid 356 alloy /

“…By addition of Sr, primary a-Al percentage increases slightly. As reported before [89,192], with Sr addition, the eutectic line is pushed downward and to the right to increase the freezing range of a-Al primary phase. This should render the a-Al percentage which could be confirmed with lever rule calculation.…”

“…As confirmed before [189,190], A1P particles and iron compounds are favorite nucleation sites for silicon. Nafisi et al [192] reported both liquidus and eutectic temperatures increase with addition of phosphorus to the Al-Si eutectic alloy. With modifier such as Sr, such potential nucieation sites are deactivated by fewer nucleation sites and consequently nucleation barrier increases and as a result the nucleation temperature decreases.…”

Assessment of the effect of grain refinement on the solidification characteristics of 319 aluminum alloy using thermal analysis

“…Thermal analysis of alloys can provide information about the composition of the alloy [8], the latent heat of solidification [11,12], the evolution of the fraction solid [8,13], the types of phases that solidify [8,14], and even dendrite coherency [15]. There are also many other uses for thermal analysis, such as, determining dendrite arm spacing [9], degree of modification [16,17] and grain refining [3,5,18] in aluminum alloys, the liquidus and solidus temperatures [8,9], characteristic temperatures related to the eutectic regions and intermetallic phase formation [19,20].…”

Effect of Phosphorus and Strontium Additions on Formation Temperature and Nucleation Density of Primary Silicon in Al-19 Wt Pct Si Alloy and Their Effect on Eutectic Temperature

“…These results on the effect of Sr addition on T 1 are presented in Figure 5 together with previous results. [9,[14][15][16] While the results show a lot of scatter, the overall downward trend with increasing Sr additions is evident. Any effect of additional P is within experimental scatter.…”

“…Song et al [13] reported that 0.02 wt pct P raised the primary silicon start temperature T 1 by 5.5 K in their BH135 alloy. Nogita et al [14] reported that addition of 50 to 360 ppm Sr reduced the primary silicon reaction temperature of Al-17 wt pct Si by some 40 K, while Robles Hernandez and Sokolowski [15] reported that 60 ppm P raised T 1 by 2.3 K while 60 ppm Sr raised T 1 by 1.8 K in the presence of 60 ppm P. In contrast, Nafisi et al [16] reported a 65 K reduction in T 1 on addition of 1500 ppm Sr in the presence of 500 ppm P.…”