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Subroutine MAP_NICKEL_SUPER4

  1. Provenance of code.
  2. Purpose of code.
  3. Specification.
  4. Description of subroutine's operation.
  5. References.
  6. Parameter descriptions.
  7. Error indicators.
  8. Accuracy estimate.
  9. Any additional information.
 10. Example of code
 11. Auxiliary subroutines required.
 12. Keywords.
 13. Download source code.
 14. Links.

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Provenance of Source Code

H.K.D.H. Bhadeshia,
Phase Transformations Group,
Department of Materials Science and Metallurgy,
University of Cambridge,
Cambridge, U.K.

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Purpose

This subroutine is for the calculation of the fraction and composition of
gamma prime in nickel base superalloys, together with their mechanical
properties.

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Specification

SUBROUTINE MAP_NICKEL_SUPER4(S,SUMVAC,A,Y,V,F,B,C,M,UTS20,
& UTS650,UTS760,UTS871,UTS982)

DOUBLE PRECISION S(8),A(8),Y(8),V(8),P(8),VAC(8),AS(8),
& SUMVAC,UTS20,UTS650,UTS760,UTS871,UTS982,F,B,C,M

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Description

If SUMVAC, the electron-valency concentration, is less than 2.3, then the
matrix is stable to the formation of topologically close-packed phases. It
is unstable otherwise.

The arrays S,A,Y, and V contain concentrations of the following alloy
elements (in order): nickel, chromium, molybdenum, aluminium, titanium,
cobalt, tungsten, and tantalum.

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References

1. S. Atamert and H. K. D. H. Bhadeshia, Materials Science and Technology, 5
(1989) 1220-1228.

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Parameters

Input parameters

S - real array of dimension 8
     S contains the concentrations (in weight percent) of the elements in
     the alloy.

Output parameters

SUMVAC - real
     SUMVAC is the electron-vacancy concentration.

A - real array of dimension 8
     A is the concentrations (in atomic percent) of the elements in the
     alloy.

Y - real array of dimension 8
     Y contains the atomic weights in gamma'.

V - real array of dimension 8
     V contains the atomic weights in gamma.

F - real
     F is the volume fraction of gamma'. If the calculated value of F is
     negative, then F is set to zero.

B - real
     B is the gamma' lattice parameter (in nanometres).

C - real
     C is the gamma lattice parameter (in nanometres).

M - real
     M is the percentage lattice misfit.

UTS20 - real
     UTS20 is the tensile strength (in MPa) at a temperature of 20oC.

UTS650 - real
     UTS650 is the tensile strength (in MPa) at a temperature of 650oC.

UTS760 - real
     UTS760 is the tensile strength (in MPa) at a temperature of 760oC.

UTS871 - real
     UTS871 is the tensile strength (in MPa) at a temperature of 871oC.

UTS982 - real
     UTS982 is the tensile strength (in MPa) at a temperature of 982oC.

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Error Indicators

None.

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Accuracy

No information supplied.

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Further Comments

None.

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Example

1. Program text

       None supplied.

2. Program data

None supplied.

3. Program results

None supplied.

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Auxiliary Routines

None.

Keywords

electron-vacancy, tensile strength

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The MAP Project originated from a joint project of the National Physical
Laboratory and the University of Cambridge.

MAP Website administration / map@msm.cam.ac.uk

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