アルミニウムおよび鋼多結晶金属における超音波伝ぱ速度の応力依存性と3次弾性定数の測定

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The third order elastic constants of polycrystalline aluminum (purity of 99.79%) and copper (purity of 99.98%)were determined by measuring their ultrasonic velocities under uniaxialy applied stress and the results were discussed by comparing with the previous data. The travel time of ultrasonic waves (5 MHz) in a specimen of 10 mm thickness was measured precisely with a sing-around system. The longitudinal and shear waves polarized parallel or perpendicular to the uniaxial stress axis were propagated perpendicular to the axis. Since the traveling time under zero stress varied slightly in the experiment, the traveling time was measured before and after periodical stress was applied and released rapidly. Elastic strains were below 200 x 10^<-6> in tension and compression and no plastic strains were observed. The results are summarized as follows : (1) The traveling time did not change linearly with applied stress. The deviation toward longer travel times was very large for copper both in tension and compression. However, the deviation for aluminum was a little. This is inferred to be the dislocation contribution. (2) To separate the measured traveling time change into two parts. one caused by the lattice anharmonicity and the other by dislocations, the measurements in both tensile and compressive conditions are needed. (3) The values of third order elastic constants measured for aluminum were in good agreement with the previous data, but not for copper. The present values, however, were most close to those calculated from the data of single crystal without containing dislocation contributions.
社団法人日本材料学会の論文
1978-10-15

アルミニウムおよび鋼多結晶金属における超音波伝ぱ速度の応力依存性と3次弾性定数の測定

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