Samuel Agnes M, Samuel Ehab, Songmene Victor, Samuel Fawzy H
Département des Sciences Appliquées, Université du Québec à Chicoutimi, Chicoutimi, QC G7H 2B1, Canada.
Department of Mechanical Engineering, École de Technologie Supérieure (ÉTS), Montréal, QC H3A 1K3, Canada.
Materials (Basel). 2023 Apr 4;16(7):2867. doi: 10.3390/ma16072867.
The present article addresses solidification parameters, and includes analyses of the macrostructure and microstructure in the light of the results obtained from the thermal analysis, from which it is possible to conclude that undercooling (T) and recalescence (T) temperatures increase with the initial increase in titanium (Ti) concentration. If the concentration reaches approximately 0.25%, a rapid decrease in these temperatures is observed. Thereafter, the temperatures increase again with the further increase in Ti concentration, and eventually become constant. These temperatures also vary depending on the superheating and casting temperature. The ∆T parameter (i.e., T - T) decreases with the Ti concentration and, from a concentration of around 0.20% Ti, this parameter becomes zero. The grain size decreases with the Ti concentration. If the concentration exceeds about 0.20%, the grain size becomes the minimum. Another parameter to be considered is the interaction between the grain refiner and the traces of other metals in the base Al alloy. For example, Al-4%B can react with traces of Ti that may exist in the base alloy, leading to the reaction between boron (B) and Ti to form TiB. Grain refinement is achieved primarily with TiB rather than AlB, or both, depending on the Ti content in the given alloy.
本文探讨了凝固参数，并根据热分析结果对宏观结构和微观结构进行了分析，从中可以得出结论：过冷度（T）和再辉度（T）温度随着钛（Ti）浓度的初始增加而升高。如果浓度达到约0.25%，则会观察到这些温度迅速下降。此后，随着Ti浓度的进一步增加，温度再次升高，并最终趋于恒定。这些温度也会因过热度和铸造温度而有所不同。∆T参数（即T - T）随着Ti浓度的增加而减小，并且从Ti浓度约为0.20%开始，该参数变为零。晶粒尺寸随着Ti浓度的增加而减小。如果浓度超过约0.20%，晶粒尺寸将达到最小。另一个需要考虑的参数是晶粒细化剂与基体铝合金中其他金属痕迹之间的相互作用。例如，Al-4%B会与基体合金中可能存在的Ti痕迹发生反应，导致硼（B）与Ti反应形成TiB。根据给定合金中的Ti含量，主要通过TiB而非AlB或两者来实现晶粒细化。
