Yielding and Deformation Behavior of the Single Crystal Nickel-Base Superalloy PWA 1480

摘要

Interrupted tensile tests were conducted to fixed plastic strain levels in <001> oriented single crystals of the nickel-base superalloys PWA 1480. Testing was done in the range from 20-1093 C, at strain rates of 0.5 and 50%/min. The yield strength was constant from 20-760 C, above which the strength dropped rapidly and became a strong function of strain rate. The high temperature data could be represented very well by an Arrhenius-type equation, which resulted in three distinct temperature regimes. The deformation substructures could be grouped in the same three regimes,