Abstract
A new process called “mechanical alloying” has been developed which produces homogeneous composite particles with an intimately dispersed, uniform internal structure. Materials formed by hot consolidation of this powder achieve the long-sought combination of dispersion strengthening and age-hardening in a high temperature alloy. While the process is amenable to making a variety of alloys, its first use has been to combine yttrium oxide and gamma prime hardening hr at 1400°F and 15,000 psi for 100 hr at 1900°F together with excellent sulfidation and cyclic oxidation resistance. From a fundamental standpoint, results show that the age-hardening dominates the low-temperature strength, dispersion strengthening dominates at high temperature, and the two are augmentative in the intermediate temperature range 1300° to 1500°F.
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