Fatigue characteristics and microcosmic mechanism of Al-Si-Mg alloys under multiaxial proportional loadings |
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Authors: | Xiao-song Jiang Guo-qiu He Bing Liu Zheng-yu Zhu Wei-hua Zhang |
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Affiliation: | (1) Honeywell Turbo Technologies, Torrance, CA 90505, USA;(2) Bodycote Thermal Processing, Andover, MA 01810, USA;(3) Light Metal Casting Research Centre, McMaster University, Hamilton, ON L8S 4L7, USA;(4) Worcester Polytechnic Institute, Metal Processing institute, Worcester, MA 01609, USA; |
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Abstract: | With the increasing use of Al-Si-Mg alloys in the automotive industry, the fatigue performance of Al-Si-Mg alloy has become
a major concern with regard to their reliability. The fatigue characteristics and microcosmic mechanism of an Al-Si-Mg alloy
under multiaxial proportional loadings were investigated in this research. As low cycle fatigue life and material strengthening
behavior are closely related, the effect of equivalent strain amplitude on the multiaxial fatigue properties was analyzed.
Fatigue tests were conducted to determine the influence of equivalent strain amplitude on the multiaxial proportional fatigue
properties. The fatigue life exhibits a stable behavior under multiaxial proportional loadings. The dislocation structures
of the Al-Si-Mg alloy were observed by transmission electron microscopy (TEM). The dislocation structure evolution of the
Al-Si-Mg alloy under multiaxial proportional loadings during low cycle fatigue develops step by step by increasing fatigue
cycles. Simultaneously, the dislocation structure changes with the change in equivalent strain amplitude under multiaxial
proportional loadings. The experimental evidence indicates that the multiaxial fatigue behavior and life are strongly dependent
on the microstructure of the material, which is caused by multiaxial proportional loadings. |
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