Dendritic coarsening in Al-2mol%Si alloy during isothermal solidification at 880K was investigated by phase field modeling.Three coarsening mechanisms operate in the alloy: (a) melting Biscuits of small dendrite arms; (b) coalescence of dendrites near the tips leading to the entrapment of liquid droplets; (c) smoothing of dendrites.Dendrite melting is found to be dominant in the stage of dendritic growth, whereas coalescence of dendrites and smoothing of dendrites are dominant during isothermal holding.The simulated results provide a better understanding of dendrite Bosch WAT28463GB Serie 6 A+++ Rated 9Kg 1400 RPM Washing Machine White coarsening during isothermal solidification.