Thermodynamic Description and Unidirectional ...
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Thermodynamic Description and Unidirectional Solidification of Eutectic Organic AMPD-DC-NPG-SCN Alloys V.T. Witusiewicz , L. Sturz, U. Hecht and S. Rex Pure compounds Binary systems Ternary systems Quaternary alloys Conclusions
Transcript of Thermodynamic Description and Unidirectional ...
Thermodynamic Description and Unidirectional Solidification of Eutectic
Organic AMPD-DC-NPG-SCN AlloysV.T. Witusiewicz, L. Sturz, U. Hecht and S. Rex
Pure compounds
Binary systems
Ternary systems
Quaternary alloys
Conclusions
CALPHAD description of AMPD-NPG system by Chellappa and Chandra
CALPHAD 27 (2003) 133-140.
Description of the heat capacity of phases of pure substances
DC SCN
AMPDNPG
Description of the Gibbs energy of phases of pure substancesDC SCN
AMPDNPG
Amino-methyl-propanediol-(D)camphor system
0.0 0.2 0.4 0.6 0.8 1.00
5000
10000
15000
20000
25000
Ent
halp
y of
tran
sfor
mat
ion
/ J
mol
-1
DC (mole fraction)
MeltingContribution from eutectic Contribution from primary phase Solid/plastic transformation
AMPD DC
Neopentylglycol-(D)camphor system
0.0 0.2 0.4 0.6 0.8 1.00
2000
4000
6000
8000
10000
12000
Enth
alpy
of t
rans
form
atio
n /
J m
ol-1
DC (mole fraction)
Melting Contribution from eutectic Contribution from primary phase Solid/Plastic
Succinonitrile-(D)camphor system
0.0 0.2 0.4 0.6 0.8 1.00
1000
2000
3000
4000
5000
6000
7000
DCSCN
Ent
halp
y of
tra
nsfo
rmat
ion
/ J
mol
-1
DC (mole fraction)
Melting Contribution from eutectic Contribution from primary phase [9]
Amino-methyl-propanediol-Neopentylglycol system
0.0 0.2 0.4 0.6 0.8 1.0
2500
3000
3500
4000
4500
NPG (mole fraction) NPGAMPD
Ent
halp
y of
mel
ting
/ J
mol
-1
BCC
+FC
C
FCC
BCC
Experimental data: Chandra and Ding, 1991 Salud et al., 1999 Present work
Description:- - -Chellappa and Chandra,2003
Present work
Amino-methyl-propanediol-Succinonitrile system
0,0 0,2 0,4 0,6 0,8 1,00
5000
10000
15000
20000
25000 Primary phase+Solid/Plastic Melting+Solid/Plastic Contribution from eutectic
Enth
alpy
of t
rans
form
atio
n /
J m
ol-1
SCN (mole fraction)AMPD SCN
Neopentylglycol-Succinonitrile system
0.0 0.2 0.4 0.6 0.8 1.00
2000
4000
6000
8000
10000
12000
Ent
halp
y of
tran
sfor
mat
ion
/
J m
ol-1
SCN (mole fraction)
MeltingSolid/Plastic Contribution from eutecticContribution from primary phase
NPG SCN
Projection of the liquid surface of systems:
AMPD-DC-SCNAMPD-NPG-SCN
Ternary AMPD-DC-NPG system
0,0 0,2 0,4 0,6 0,8 1,0
0,0
0,2
0,4
0,6
0,8
1,0 0,0
0,2
0,4
0,6
0,8
1,0
94.2
69.669.467.8
70.178.4
92.590.9
109.8
81.7 73.268.5
80.2
NPG (weight fraction)AMPD NPG
DC
54.1
Liquidus surface in AMPD-DC-NPG system
Unidirectional solidification of AMPD-DC-NPG alloys
Unidirectional solidification of the AMPD-DC-NPG alloys
Ternary DC-NPG-SCN system
0.0 0.2 0.4 0.6 0.8 1.00.0
0.2
0.4
0.6
0.8
1.00.0
0.2
0.4
0.6
0.8
1.0
53
30.331.3
38.1
34.3
75.5
34.937.1
30.3 36.934.5
32.9
33.544.0
37.2
NPG
DC SCNSCN (weight fraction)
Unidirectional solidification of the DC-NPG-SCN alloys
Unidirectional solidification of a quaternary three phase alloy SCN-45.26wt.%DC-18.44wt.%NPG-1.50wt.%AMPD
Th=45 oC; Tc=1 oC; ∆x=10 mm; V=0.011 µm s-1
Unidirectional solidification of a quaternary three phase alloy SCN-43.97wt.%Dc-16.98wt.%NPG-3.34wt.%AMPD
Th=45 oC; Tc=7 oC; ∆x=5 mm
V=0.014 µm s-1 V=0.014→0.007 µm s-1
