Sources for material file data

[MattRolchigo]

Add file with sources for interface response functions and freezing ranges for data in examples/Materials

[cocmo1024]

For this file I would make provenance machine-readable rather than leaving it only in a README. Per material entry, useful fields would be:

• source type (measured / CALPHAD / literature fit);
• DOI, report, or dataset identifier;
• exact nominal composition and material condition;
• property definition and units;
• valid temperature/composition range;
• uncertainty, if reported;
• extraction or fitting method;
• thermodynamic-database and method version; and
• a source-file hash plus license/reuse note.

For freezing ranges specifically, it would help to record how solidus/liquidus were defined (equilibrium, Scheil, measured onset/end, etc.). For interface-response functions, the calibration alloy, process window, and any fitted coefficients should be explicit. This lets a future user distinguish “the citation is correct” from “the data are applicable to this composition and thermal history.”

CuCrZr is a useful edge case because the grade label alone does not define the chemistry, temper, or post-process state. This affiliated copper-alloy overview illustrates that downstream distinction; I am not proposing it as a thermophysical-data source. Disclosure: I work with COPPER 3DP / Como Precision.