IMPROVEMENT OF THE AGE-HARDENING PROPERTIES OF MAGNESIUM-RARE-EARTH ALLOYS BY ADDITION OF SILVER

Journal Article · Wed Jun 01 04:00:00 EDT 1960 · J. Inst. Metals

OSTI ID:4160526

Payne, R J.M.; Bailey, N

With the object of developing alloys of improved proof stress, the properties of cast aad wrought magnesium alloys containing rare-earth metals as the principal hardening agent were studied in the solution-treated and agehardened condition. It is shown that the response of magnesium-rare-earth alloys to age-hardening is mark- . edly improved by the addition of 2 to 3% silver. Mechanical properties depend on the particular rare-earth mixture used and improve in the order: mischmetall, mischmetall + thorium, necdymium (i.e. a mixture of the didymium type containfng a greater proportion of neodymium and a smaller proportion of less favorable rare-earth metals than does didymium). Zirconium is an indispensable constituent of cast and wrought alloys. The wonk indicates the suitability of two magnesium - silver- neodymiumzirconium alloys for castings: these alloys, now known as "MSR-A" and "MSR-B," show proof stresses up to 13 tons/in./sup 2/ The results with wrought alloys were very variable and further research is required; in some instances, proof stresses reached 23 tons/ in./sup 2/, a level hitherto achieved only in material with retained cold work. The improvement in properties, brought about by the addition of silver appears to be specific to that element, and this fact is briefly discussed. (auth)

• Research Organization: J. Stone and Co. (Charlton), Ltd., London
• NSA Number: NSA-14-022059
• OSTI ID: 4160526
• Journal Information: J. Inst. Metals, Journal Name: J. Inst. Metals Vol. Vol: 88
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ADDITIVES
CASTING
CERIUM ALLOYS
COLD WORKING
EFFICIENCY
HEAT TREATMENTS
LANTHANUM ALLOYS
MAGNESIUM ALLOYS
MECHANICAL PROPERTIES
METALS, CERAMICS, AND OTHER MATERIALS
MISCH METAL
MIXING
NEODYMIUM
PRASEODYMIUM
RARE EARTHS
SILVER
STANDARDS
STRESSES
TEMPERING
THORIUM
ZIRCONIUM