TQGDF2

Fortran	TQGDF2 (MODE, IMATR, IPREC, NIE, IIE, XMATR, TEMP, DF, XPREC, XEM, XEP, MUI, IWSG, IWSE)
C-interface	tq_gdf2(TC_INT mode,TC_INT imatr,TC_INT iprec,TC_INT nie,TC_INT iie,TC_FLOAT xmatr,TC_FLOAT temp,TC_FLOAT* df,TC_FLOAT* xprec,TC_FLOAT* xem,TC_FLOAT* xep,TC_FLOAT* mui,TC_INT* iwsg,TC_INT* iwse);
Full name:	Get the driving force of nucleation and local equilibrium concentration for a phase transformation under para- or ortho-equilibrium condition.
Purpose:	Obtain data on both the chemical driving force for the nucleation of a precipitate and the local equilibrium concentration at the matrix/precipitate interface under para- or ortho-equilibrium conditions. See Example 11.
Comments:	For ortho-equilibrium calculations, XPREC can be inputs or outputs, depending on whether its values are known before the calculation or not. If unknown, the values of XPREC should be set to zero or negative when calling this subroutine and on return one obtains the composition of the precipitate at which the maximum driving force is available. The use of this subroutine for the ortho-equilibrium calculation supersedes that of the obsolete subroutine TQGDF.
Arguments
Name	Type	Value set on call or returned
MODE	Integer	Set type of output and type of composition to use (±1, ±2, and ±3 correspond to mole fraction, weight fraction and U-fraction respectively. However, ±3 can be used only with para-equilibrium calculations. If negative, calculate and output only driving force data. This saves the time for equilibrium calculation when you are not interested in local equilibrium concentrations)
IMATR	Integer	Set index of matrix phase
IPREC	Integer	Set index of precipitate phase
NIE	Integer	Set number of interstitial element(s). Zero implies no para-equilibrium calculation
IIE	Integer array	Set index of interstitial element(s), only relevant for para-equilibrium condition
XMATR	Double precision array	Set composition of matrix phase. Composition type depends on MODE
TEMP	Double precision	Set temperature in Kelvin
DF	Double precision	Return driving force in J/mol of atoms if MODE = ±1, ±2 and J/mole of substitional atoms if MODE = ±3
XPREC	Double precision array	Return composition of the precipitate phase at the maximum driving force under para/ ortho-equilibrium condition or set to a known composition of the precipitate in order to get the driving force of phase transformation. Composition type depends on MODE
XEM	Double precision array	Return, if both MODE and DF are positive, local equilibrium composition of matrix phase. Composition type depends on MODE
XEP	Double precision array	Return, if both MODE and DF positive, local equilibrium composition of precipitate phase. Composition type depends on MODE
MUI	Double precision array	Return, if both MODE and DF are positive, chemical potential of interstitial elements. Relevant for only para-equilibrium calculation.
IWSG	Integer array	Workspace
IWSE	Integer array	Workspace