TERNARY allows ternary phase diagrams
(ie for three component systems) to be calculated and plotted for a
variety of temperatures. The TERNARY module uses MULTIPHASE
to carry out the calculation of phase equilibria and as such allows a
wide combination of phases such as alloys, molten salts, gases, aqueous
solutions, slags, mattes and pure stoichiometric substances.
for the calculations are retrieved either from
specified databases or from a datafile prepared in advance. This
datafile would normally have been generated from the databases
by means of the ACCESS module or from within TERNARY
itself. The databases will depend
on the installation.
the temperature has been fixed and an initial composition has been
chosen either by means of the graphics cursor or use of the SET
command, the calculation and plotting are entirely automatic; a
complete plot, consisting of the calculated tie lines and fitted phase
boundaries, is guaranteed if the starting point is well chosen and all
two- and three- phase regions are adjacent. With less straightforward
diagrams, some judgement is required as to whether:
starting point is appropriate,
(b) the diagram is really complete after the
automatic plotting process has terminated and
(c) whether a search for miscibility gaps should be
carried out during the calculations.
program allows the exclusion of some phases from the equilibrium
system, so that metastable systems can be investigated.
numerical results of the calculations for each diagram are
automatically stored in a ternary results file. This allows diagrams to
be replotted with the option to rearrange the order of the components
and to magnify a portion of the diagram for detailed study of a
particular area. A facility for labelling phase fields also exists, and
further annotation or experimental data may be superimposed on a
replotted diagram from information stored in a data file.
output is sent both to the screen and to a file so that the contents
can be routed to a local plotter, either from within the program or by
using operating system commands.
Brief summary of commands
allows the user to define the system to be studied in terms of the
three components. allows the user to name the datafile from which the
to be retrieved or to define the system to be studied in terms
of the three components, in which case the data are retrieved from
a named database. The datafile must be in the MTDATA
format (file extension ".mpi") and should preferably
have been retrieved in advance by means of the ACCESS
from within TERNARY or an equivalent module.
When a database search has been performed, the data for the system
under study are written to a user-defined or default file. The file
name together with the date and time of plotting are displayed in the
top left hand corner of the finished diagram.
LIST displays the current definition of the problem in
the status of the elements, components,
substances or phases present
(b) the temperature and
pressure/volume set by the user.
(c) whether the diagram is to
be plotted in terms of mole or mass fraction and the starting
compositions for calculations if defined using the SET command.
CLASSIFY allows the status of individual phases or
substances to be classified
as NORMAL (present) or ABSENT from the calculation. The number
of miscibility gaps potentially present may also be specified
if they are to be taken into account in the calculation.
SET allows the user to specify the temperature and
pressure to be used for the calculation, and whether the ternary plot
produced is to be calibrated in mass fraction or mole fraction. A
composition may also be specified, in terms of mole fraction or mass
fraction, which acts as either the start point for phase diagram
calculations or as the centre of any replotted magnified diagram.
COMPUTE initiates the computation of the ternary diagram
at the temperature specified in SET TEMPERATURE. If
a starting composition has not already been set, the graphics cursor
will appear and should be moved to the required starting point. The
calculation and plotting of the diagram is entirely automatic for
straightforward systems. The graphics cursor reappears on completion of
the plot and, if desired, may be used to label the phase fields or to
restart the calculation in a different region of the diagram. Output is
sent simultaneously to the screen and a system scratch file. Hard copy
output can be obtained by using the command LASER
which copies the contents of this file to your local plotting device.
REPLOT allows a previously calculated diagram to be
replotted at the terminal from tie line information stored in a ternary
results file. Various options are available to allow magnification of a
chosen portion of the diagram, rearrangement of the component axes,
selection of weight or mole fraction composition scale and the addition
of labelled experimental data and other annotation stored in a file.
LASER sends a copy of any diagrams plotted on the screen
to a local
plotting device if available.
RETURN takes the user out of TERNARY
back to the module level.
runs a macro taken from a file. The name of the file should be
entered in quotes. Commands can also be passed through to the
operating system by prefixing them with a $ (dollar sign). The
dollar sign and operating system command should be entered within
introduction gentle introduction to using
the options available in TERNARY contains annotated
examples, each directed towards achieving a particular outcome,
showing typical combination of commands which would be necessary
to achieve that end.
summary of the commands
available can also be used as an index to obtain more detailed
help about each command.
data can be overlayed onto calculated ternary diagrams.