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