Document Details
PURL
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Title:
Quarterly Progress Report No. 7: Fundamental Alloy Development Studies
Author(s):
Document Type:
REPORT
Publication Date:
1957 Aug 01
Declassification Date:
1970 May 05
Accession Number:
None
Document Number(s):
APEX--334
Originating Research Org.:
General Electric Co., Cincinnati, OH (United States). Aircraft Nuclear Propulsion Dept.
OpenNet Entry Date:
2015 Mar 30
OpenNet Modified Date:
2023 Dec 21
Description/Abstract:
As-cast surveys of the binary systems of yttrium-titanium and yttrium-chromium were completed, and isothermal annealing treatments to investigate the solid-state phase fields were started. Tentative phase diagrams are presented; both alloy systems exhibit a single eutectic with no intermediate phases and very restricted primary solid solubilities. A preliminary as-cast survey of the binary system, yttrium-cerium, was started from 0 to 100 percent cerium by 10 weight percent increments. Very extensive solid solubility of cerium in yttrium is indicated. The hydriding of yttrium was continued at low temperatures (from 500°C to room temperature). A phase was found to form below 305°C (581°F) and to be stable at atmospheric pressure. Its formation from YH2 is very rapid, complete, and occurs at a specific temperature level. Reversibility of the reaction occurs repeatedly on lowering and raising the temperature.