The Role of Interstitials in the Anomalous Work Hardening of Metals and Alloys.
FLORIDA UNIV GAINESVILLE ENGINEERING AND INDUSTRIAL EXPERIMENT STATION
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An investigation of the strength of dynamic strain aging in nickel and nickel-cobalt alloys of different stacking fault energies using approximately 25 micrometer grain size tensile specimens deformed at a crosshead speed of 0.02 inmin between approximately 77 and 900K has shown that the phenomenon is exhibited prominantly only in Nickel 200. The ultimate strength peak that occurs in Nickel 200 at approximately 525K has been shown not to be a true work hardening peak in the sense of that in Fe and Ti. Change in strain rate tests were performed on Nickel-40Cobalt and Nickel-60Cobalt alloys and confirmed other indications that only mild dynamic strain aging occurs in these alloys. It was found that Nickel-60Cobalt alloy twins heavily at low temperatures and probably accounts for an approximately tenfold increase in strength and a total elongation of approximately 100 in this alloy.
- Metallurgy and Metallography