Structure Changes in Metals Fatigued at an Ultrasonic Frequency : 1 st Report, Aluminium

Bulletin of JSME

Online ISSN : 1881-1426
Print ISSN : 0021-3764

Structure Changes in Metals Fatigued at an Ultrasonic Frequency : 1 st Report, Aluminium

Jobu AWATANI, Kazumune KATAGIRI, Atsuo KOREEDA

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1969 年 12 巻 53 号 p. 940-946

DOI https://doi.org/10.1299/jsme1958.12.940

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Transmission electron microscopy has been used to study the structure changes in polycrystalline aluminium fatigued at very high repetition frequency (17.7 kc/sec). A number of small dislocation loops and voids were observed frequently and sometimes large loops on {012} planes. These are thought to be formed as the result of the condensation of vacancies. Rough estimation is made of the number of vacancies generated in the fatigue-process. The effect of vacancies on the fatigue life is briefly discussed.

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© The Japan Society of Mechanical Engineers

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