The data on the stress relaxation at room temperature in single-crysta
l sheet Mo and at high temperatures in low-alloy Cr (600-1000 degrees
C), single-crystal Mo, W, Mo-3% Nb alloy (1200-1600 degrees C), and Zr
C1.00 (1600-2200 degrees C) are present. The stress-relaxation mechani
sms in the materials differ in the different temperature-force ranges.