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Effect of JDN-I flux on DAS of A356 alloy at different cooling rate
Ist Teil von
Materials science & engineering. A, Structural materials : properties, microstructure and processing, 2003-05, Vol.348 (1), p.1-5
Ort / Verlag
Amsterdam: Elsevier B.V
Erscheinungsjahr
2003
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
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 (
λ
2) obtained by water-quenching decreases by 30.8% in comparison with that by air-cooling without the covering of the flux, while
λ
2 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,
T
̇
1
and
T
̇
2
. If the cooling rate
T
̇
<
T
̇
1
,
λ
2 is primarily determined by
M which is determined by the compositions, diffusion coefficient of the alloy. If
T
̇
>
T
̇
2
,
λ
2 is determined by the [RE] of JDN-I flux and solidification time
t
f. If
T
̇
1
<
T
̇
<
T
̇
2
,
λ
2 is determined by
t
f, [RE] and
M together.