CREEP CHARACTERISTICS OF MAGNESIUM SINGLE CRYSTALS FROM 78 TO 364 K

Journal Article · Fri Aug 01 04:00:00 EDT 1958 · Trans. Met. Soc. AIME

OSTI ID:4288897

Conrad, H; Robertson, W D

Incremeatal loading creep tests were conducted on magnesium single crystals in tension and direct shear at 78 to 384 deg K. The creep curves were transient in character and exhibited waves or periouic behavior, especially at small strain rates. A sigmoidal curve was frequently observed following the first occurrence of creep. Repeating of segments of a master curve was observed at all temperatures indicating that identical conditions for flow existed after various stress and strain histories. A logaritmic time law with a independent of temperature was observed at 78 and 203 deg K while a parabolic (power) time law was approximated at 298 and 364 deg K. The departure from logarithmic creep was attributed to recovery, which was observed at 298 and 364 deg K. The temperature independence of a represents a serious objection to the theory of low-temperature creep based on the intersection of dislocations. (auth)

• Research Organization: Westinghouse Research Lab., Pittsburgh; Yale Univ., New Haven, Conn.
• NSA Number: NSA-12-017263
• OSTI ID: 4288897
• Journal Information: Trans. Met. Soc. AIME, Journal Name: Trans. Met. Soc. AIME Vol. Vol: 212
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

CREEP
DEFECTS
DEFORMATION
DIAGRAMS
DISLOCATIONS
LOW TEMPERATURE
MAGNESIUM
MATERIALS TESTING
MINERALOGY, METALLURGY, AND CERAMICS
MONOCRYSTALS
RECOVERY
SHEAR
STRESSES
TENSILE PROPERTIES