Title of article :
Effect of JDN-I flux on DAS of A356 alloy at different cooling rate
Author/Authors :
Ni، نويسنده , , Hongjun and Sun، نويسنده , , Baode and Jiang، نويسنده , , Haiyan and Shu، نويسنده , , Da and Lin، نويسنده , , Wanli and Ding، نويسنده , , Wenjiang، نويسنده ,
Abstract :
A novel JDN-I flux containing a rare earth compound that has been studied has great effect on the secondary dendrite arm spacing (DAS) of A356 alloy. The experimental results indicate that the DAS (λ2) obtained by water-quenching decreases by 30.8% in comparison with that by air-cooling without the covering of the flux, while λ2 obtained by water-quenching decreases by 88.2% in comparison with that by air cooling with the covering of JDN-I flux. It is shown that there are two critical cooling rates, Ṫ1 and Ṫ2. If the cooling rate Ṫ<Ṫ1, λ2 is primarily determined by M which is determined by the compositions, diffusion coefficient of the alloy. If Ṫ>Ṫ2, λ2 is determined by the [RE] of JDN-I flux and solidification time tf. If Ṫ1<Ṫ<Ṫ2, λ2 is determined by tf, [RE] and M together.
Keywords :
JDN-I flux , A356 alloy , DAS , Water-quenching , Air-cooling , Cooling rate
Journal title :
Astroparticle Physics
