Correlation between mechanical properties and amount of dendritic α-Al phase in as-cast near-eutectic Al–11.6% Si alloys modified with strontium

Effect of grain refiner-modifier interaction on the performance of A356.2 alloy /

“…They suggest that the effect is related to the depression of the eutectic temperature due to the addition of strontium. The statistical results 22 show that the amount of dendritic o-Al phase increases with the addition of Sr, as may be seen in For silicon modification assessment, the eutectic growth temperature difference between modified and unmodified melts is used to indicate the modification level. 24 The larger the magnitude of this difference, the higher the level of modification.…”

“…Thus, subsequent grain refinement of primary Al dendrites becomes a necessary step to further materialize the beneficial effects of eutectic modification on properties. These researchers 22 also reported that Sr addition affects the amount of dendritic os-Al phase. They suggest that the effect is related to the depression of the eutectic temperature due to the addition of strontium.…”

“…Liao et al 22 ' 23 reported that the addition of Sr to Al-11.6%Si alloys promotes the columnar growth of primary Al dendrites, a condition which is deleterious to the mechanical properties of alloys. Thus, subsequent grain refinement of primary Al dendrites becomes a necessary step to further materialize the beneficial effects of eutectic modification on properties.…”

“…In other words, if both additives perform in the same manner when combined, the solidification range, or the temperature difference from a-Al nucleation temperature to eutectic temperature, should increase by 11-13°C. 9 The addition of small amounts of Ti and B will cause shifts in the cooling curves Liao and Sun 22 concluded that in near-eutectic alloys, the refining effect of boron is weakened due to an increase in the addition of strontium, in other words, the refining ability of boron is poisoned by strontium. A mutual poisoning effect was to be observed when the contents of Sr and B exceeded a certain limit, i.e.…”

Prediction of Mechanical Properties of AlSi13Cu2Fe Alloy Using the ATND Methods

“…Therefore, these alloys find their application in the automotive industry, machinery and household industries, as well as in military and aviation applications. Their mechanical properties are directly affected by shape, size and distribution of silicon crystals, aluminum grain size, as well as shape and parameters of dendrite, which are considered as the main factors influencing application field of the Al-Si alloys in production of the castings [1][2][3][4][5][6][7] . The coarse structure of the alloy, disadvantageous from technical point of view, having adverse effect on the mechanical properties of the castings, can be effectively eliminated by use of modification processes.…”