Comparison of Mechanical Properties between As-Quenched and Annealed Metallic Glass Pd44Cu31Ni8P17
In order to examine the correlation between a mechanical property and an excess free volume for metallic glass Pd44Cu31Ni8P17, longitudinal and transverse ultrasonic velocities were measured to estimate longitudinal and transverse elastic constants, c11 and c44. An as-quenched sample, an annealed one at a temperature just below a glass transition temperature Tg and a crystalline one were prepared. The as-quenched sample contains the excess free volume depending on the preparing process. The Young’s modulus E, the Poisson’s ratio, a bulk modulus and c12 are estimated using c11 and c44. The values of c11, c 44 , c12 and E of the as-quenched one are smaller than those of the annealed sample losing excess free volume by about 0.2 % and much smaller than those of the crystalline one. The Poisson’s ratio for the as-quenched sample and the annealed one are 0.389 and 0.387, respectively, which are much larger than that for the crystalline one with 0.349.
Young Won Chang, Nack J. Kim and Chong Soo Lee
T. Fukami et al., "Comparison of Mechanical Properties between As-Quenched and Annealed Metallic Glass Pd44Cu31Ni8P17", Materials Science Forum, Vols. 561-565, pp. 1303-1306, 2007