THE EFFECTS OF STORED ENERGY AND RECRYSTALLIZATION ON THE CREEP RUPTURE PROPERTIES OF INTERNALLY OXIDIZED COPPER-ALUMINA AND COPPER-SILICA ALLOYS. Period covered: September 1, 1958 to September 1, 1959

Technical Report · Tue Dec 01 04:00:00 EST 1959

OSTI ID:4138023

Adachi, M; Grant, N J

Copper-silica and copper-alumina alloys of low oxide content were produced by the internal oxidation and extrusion of copper-silicon and copper- aluminum alloy powders. These alloys show normal behavior after recrystallization. With increasing amounts of recrystallization at 1050 tained C, the creep rupture strength at 450 tained C decreases and the ductility increases. Cold work of the partially or completely recrystallized alloys results in an increase in creep rupture strength and a decrease in ductility. The strength of dispersed oxide hardened alloys of this kind is due to a combination of micron or sub-micron dispersion of an insoluble oxide and a high value of stored energy through cold work. In the as-extruded condition, both the dispersion and the cold work impede the dislocation movements. After recrystallization the only impediment to dislocation movement is the oxide dispersion. Improved ductility and higher creep rates are a result. (auth)

• Research Organization: Massachusetts Inst. of Tech., Cambridge
• NSA Number: NSA-14-019446
• OSTI ID: 4138023
• Report Number(s): WADC-TR-59-777
• Country of Publication: United States
• Language: English

Related Subjects

ALUMINUM ALLOYS
ALUMINUM OXIDES
COLD WORKING
COPPER ALLOYS
CREEP
DEFECTS
DISLOCATIONS
DISPERSIONS
DUCTILITY
ENERGY
EXTRUSION
FAILURES
HIGH TEMPERATURE
METALS, CERAMICS, AND OTHER MATERIALS
OXIDATION
POWDERS
RECRYSTALLIZATION
SILICIDES
SILICON OXIDES
SOLUBILITY
TEMPERATURE
TEMPERING
TENSILE PROPERTIES