Quaternary and Higher Order Alloy Additions to Oxide Dispersion Strengthened High Volume Fraction Gamma Prime Ni-Cr-Al Alloys Made by Mechanical Alloying.

摘要

The object of this work was to develop ODS alloys which would derive a significant high temperature strength increment from the retention of high volume fractions (>50%) of gamma at 2000 F(1095 C). This investigation has identified the nature and level of quaternary addition elements that are beneficial to the directional recrystallization response and properties of ODS, high volume fraction gamma, Ni-Cr-Al alloys made by mechanical alloying. Specifically, the effects of quaternary additions of W, Ta, Nb, Mo, Co, Hf and Ti were investigated. In particular, the quaternary alloys with W and Mo respectively exhibited significant high temperature strength advantages over DS Mar M-200 + Hf and a current DS gamma/gamma-alpha eutectic. Raising the CR level in the ternary Ni-Cr-Al base alloy significantly improved the corrosion resistance. Oxidation resistance of the experimental alloys was excellent. The data from the simple ternary and quaternary alloys was used to initiate a program of designing more complex alloys.