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MATERIALS TRANSACTIONS
Vol. 51 (2010) , No. 7 pp.1255-1263
Determination of the Cyclic-Tension Fatigue of Extruded Pure Magnesium Using Multiple Ultrasonic Waves

Hideki Yamagishi1)2), Mikio Fukuhara2) and Akihiko Chiba2)

1) Central Research Institute, Toyama Industrial Technology Center
2) Institute for Materials Research, Tohoku University

(Received December 24, 2009)
(Accepted March 31, 2010)

Three acoustic techniques, namely longitudinal wave reflection, vertically-polarized shear wave (SV) reflection, and horizontally polarized shear wave (SH) transmission methods, were used to assess the cyclic-tension fatigue of an extruded pure magnesium. The acoustic velocities were measured by the reflection methods, and found to decrease considerably at the beginning of the fatigue. This suggests that void defects formed at grain boundaries (Coble creep). Decrease in the elastic moduli and increase in the internal frictions revealed decrease in the mechanical and increase in the viscoelastic properties during the fatigue progress, respectively. For SH transmission method, acoustic parameters such as propagation time, amplitude and logarithmic damping ratio were strongly affected by detouring of acoustic waves, accompanied by variation in the residual stress caused by acoustoelasticity, in comparison with the reflection methods. These acoustic results were determined using OM, SEM, Vickers hardness tester, surface roughness tester and XRD.

Keywords: pure magnesium, fatigue, nondestructive evaluation, multiple ultrasonic waves, Coble creep

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