FATIGUE PROPERTIES OF NANO- AND MICROCRYSTALLINE ALUMINUM ALLOYS: A NEW METHOD FOR TESTING AND EXPERIMENTAL RESULTS |
| 5 | |
| 2010 |
| scientific article | 538.951:539.375.5 | ||
| 46-52 | fatigue, fatigue testing facility for miniature samples, nano- and microcrystalline materials, aluminum alloys |
| A new method to study fatigue properties of metallic materials at elevated temperatures has been developed. A
fatigue testing facility has been designed and built for bending fatigue tests of miniature samples in the regime of
auto-oscillations. Aluminum-silicon alloys have been studied in the as- cast state and in the nano- and microcrystalline
(NMC) states obtained by the spray-technology and using equal-channel angular pressing (ECAP). NMC aluminum
alloys of AK12 type processed by ECAP have been shown to have higher fatigue characteristics than their
coarse-grained analogs; and NMC aluminum alloys of AK21 type processed by the spray-technology and ECAP
have higher fatigue characteristics at a temperature of 350 oC than the analogous NMC cast alloys processed by
ECAP. The patterns of the fatigue crack propagation process have been studied for NMC Al- Si alloys. |
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