Materials Transactions Online

Materials Transactions, Vol.57 No.12 (2016) pp.2104-2109
© 2016 The Japan Institute of Metals and Materials

Delaying Effect of High-Density Electric Current on Fatigue Crack Growth in A6061-T6 Aluminum Alloy

Jaewoong Jung1, Yang Ju1, Yasuyuki Morita1, Yuhki Toku1 and Yoshihiko Uematsu2

1Department of Mechanical Science and Engineering, Nagoya University, Nagoya 464-8603, Japan
2Department of Mechanical Engineering, Gifu University, Gifu 501-1193, Japan

This study examined the delaying effect of fatigue crack growth induced by high-density electric current on A6061-T6 aluminum alloy. To investigate the effect, fatigue tests were conducted using specimens with and without electric current treatment. The fatigue life of the treated specimens increased significantly compared with untreated specimens. After the tests, the fracture surfaces were examined using scanning electron microscope. In the specimens in which electric current was applied, local melting on the crack surface was observed via fractography. To clarify the effects of electric current treatment on fatigue crack propagation, early crack growth was investigated using the plastic replication method. A delaying effect was particularly noticeable in the small-crack region. Results show that this delaying effect can be attributed to crack shielding caused by local melting on the crack surface, which signifies that the fatigue life is improved by the application of high-density electric current.

[doi:10.2320/matertrans.M2016240]

(Received 2016/06/30; Accepted 2016/09/21; Published 2016/11/25)

Keywords: fatigue, aluminum alloy, high-density electric current, delaying effects, fatigue crack growth

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