1136. ジルコニウム水素化物および水素固溶体の機械的性質

Abstract

In the present study, such mechanical properties of hydrogenated zirconium as sound velocities, elastic moduli, hardness and stress-strain curve have been evaluated by ultrasonic pulse-echo method, Vickers hardness test, tensile test and resonance method using cantilever beam specimens, and the influence of the hydrogen uptake on the mechanical properties of zirconium alloys has been studied. The elastic moduli of solid zirconium hydride estimated from the sound velocities were larger than that of pure zirconium metal, and slightly depended on the hydrogen content. The hardness of the solid zirconium hydride was much higher than that of the pure zirconium, and decreased with increasing the hydrogen content. The Young's modulus of the solid zirconium hydride obtained from the tensile tests was in good agreement with the value estimated from the sound velocities. The elastic moduli of hydrogen solid solution obtained by the resonance method decreased with the hydrogen content. The elastic moduli of partially precipitated hydride were also measured by the resonance method, and the results could be elucidated from the datum of the elastic moduli of the solid zirconium hydride and the hydride solid solution obtained in the present study.