Behavior of a submicrocrystalline aluminum alloy 1570 under conditions of cyclic loading |
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| Authors: | E V Avtokratova O Sh Sitdikov R O Kaibyshev Y Watanabe |
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| Affiliation: | (1) Institute for Problems of Superplasticity of Metals, ul. St. Khalturina 39, Ufa, 450001, Bashkortostan Russia;(2) Nagoya Institute of Technology, Nagoya 466-8555, Japan;(3) Belgorod State University, ul. Koroleva 2a, Belgorod, 308034, Russia |
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| Abstract: | A study of the resistance to fatigue-crack growth in a submicrocrystalline alloy Al-6% Mg-0.3% Sc-0.4% Mn in combination with a precision analysis of the fracture surface of the samples has been performed. A comparison of crack resistance between coarse-grained and submicrocrystalline states of this alloy showed that only at the stage of near-threshold crack growth the velocity of fatigue-crack propagation in the submicrocrystalline state proves to be higher than that in the coarse-grained state. At the stage of linear crack growth, the fatigue-crack propagation becomes insensitive to the grain size. Upon transition to the stage of accelerated crack growth, the velocity of crack propagation in the submicrocrystalline alloy is retarded. A fractographic analysis of the fracture surface of the samples indicates that the retardation of the fatigue-crack growth in the submicrocrystalline alloy is connected with a gradual transition from the intercrystalline to the transcrystalline mechanism of fatigue fracture of the material. |
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