A METALLOGRAPHIC STUDY OF THE AGEING CHARACTERISTICS OF BERYLLIUM-IRON ALLOYS, BETWEEN 400 C AND 1050 C

Technical Report · Wed Aug 01 04:00:00 EDT 1962

OSTI ID:4794115

Lindsay, H M; Moore, A

The aging characteristics of Be--Fe alloys containing 0.03 to 0.4 wt% Fe were determined by tensile testing at 600 deg C. Specimens from cast-and-extruded alloys were examined in the as extruded and aged conditions and also after cycling between the solution treated and aged conditions. There was agreement between the metallographic observations and the corresponding ranges for solution treatment and aging, as defined from mechanical properties. It was concluded, however, that in no case is a single phase solid solution retained on quenching to 20 deg C. Generally, aging at temperatures of 100 to 200 deg C below the solutlon treatment zone led to precipitation primarily on a network 5 to 10 mu wide, adjacent to the grain boundaries, and to a lesser degree within the matrix. By contrast, aging at higher temperatures led to an increase in precipitation at grain boundaries, and the development of a denuded zone 5 mu wide adjacent to the grain houndaries. (P.C.H.)

• Research Organization: United Kingdom Atomic Energy Authority. Weapons Group. Atomic Weapons Research Establishment, Aldermaston, Berks, England
• NSA Number: NSA-16-030778
• OSTI ID: 4794115
• Report Number(s): AWRE-0-48/62
• Country of Publication: United Kingdom
• Language: English

Related Subjects

BERYLLIUM ALLOYS
CASTING
CONFIGURATION
EXTRUSION
GRAIN BOUNDARIES
HEAT TREATMENTS
HIGH TEMPERATURE
IRON ALLOYS
MATERIALS TESTING
MECHANICAL PROPERTIES
METALLOGRAPHY
METALS, CERAMICS, AND OTHER MATERIALS
PHASE DIAGRAMS
PRECIPITATION
QUANTITATIVE ANALYSIS
QUENCHING
TEMPERATURE
TENSILE PROPERTIES
THICKNESS