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- W1565955547 abstract "Accurate prediction of fatigue performance and life is a key issue in the design and applications of the high strength-to-weight ratio of many contemporary magnesium alloys, which are suitable for ultimate weight reduction purposes in automotive and aircraft components. For example, the ever increasing demands for higher efficiency and light weight typical cases of power generation, aerospace and automotive industries call the maximum exploitation of the material’s properties. The combination of low density (about 1.74 g/ cm3), high specific strength and excellent castability qualifies magnesium alloys as ideal materials for the lightweight constructions [1]. Thus, purely empirical models that heavily rely on larger safety factors are of limited uses. It is now widely recognized that fatigue damage models that are closely related to the microstructural features to provide a more reliable basis for a life prediction, provided that the relevant microstructural damage mechanisms are accurately accounted for. Therefore, there are increasing interests in the fatigue tests combined with the high-resolution microscopic techniques, environmental influencing factors, and especially in understanding their fatigue crack initiation and propagation behaviors with process rationalization [2-4]. Subsequently experimental observations on cast magnesium alloys have accumulatively revealed that the dendrite cell size, pores, secondary phase particles, persistent slip bands and twinning in the dendrite cells considerably affect on the fatigue durability and fatigue cracking behavior or crack growth mechanism of dendritic magnesium alloys [5-8]. The quantitative estimation of small fatigue crack growth rate of cast magnesium alloys is whether simply and effectively to assist the reversed design of cast magnesium alloys or ceaselessly to improve the strength and toughness of cast magnesium alloys. At the same time, it is necessary how to understand that these microstructural features of cast magnesium alloys play role in the fatigue cracking behavior or that the microstructural evolution reacts to the applied loadings. However, it is difficult to use conventional alloying techniques to improve some of their properties, e.g. elastic modulus, elastic-plastic deforming property and the different thermal expansion between phases during the shrinking at the high elevated temperatures. Under these conditions the elastic, and the possible plastic, properties of the secondary phase will influence the mechanical response during an applied loading since the interface of secondary phase will transmit stresses from the matrix around the secondary phase when the interface both the matrix and secondary phase has a compatible strain field. If the elastic" @default.
- W1565955547 created "2016-06-24" @default.
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- W1565955547 date "2011-09-12" @default.
- W1565955547 modified "2023-10-01" @default.
- W1565955547 title "Fatigue Cracking Behaviors and Influence Factors of Cast Magnesium Alloys" @default.
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- W1565955547 doi "https://doi.org/10.5772/19075" @default.
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