Abstract
In the present paper, the high cycle fatigue (HCF) of a novel 211Z.X aluminum alloy with high strength was studied under hot-rolling and as-cast states at room temperature. The effects of microstructure and distribution of precipitated phases and impurities on the mechanical properties, HCF performances, fatigue microcrack initiation, and propagation behavior of the 211Z.X alloy were studied by transmission electron microscopy (TEM), scanning electron microscopy (SEM) and energy dispersive spectrometry (EDS). The HCF S–N curves, P–S–N curves and Goodman fatigue diagrams of 211Z.X alloy consisting of two microstructures were drawn. The results suggested that the fine and dispersive distribution of the second phases improved the strength of the alloy. The formation of short-bar and spherical precipitates promoted coordinated deformation of the alloy. This promoted higher microcrack initiation resistance of 211Z.X alloy with a hot rolling state than in the cast state. As a result, the HCF properties of the hot-rolling alloy were better than those of the cast alloy. In sum, these results look promising for future reliable design of engineering structures and application of new aluminum alloys.
Highlights
Aluminum alloys are better in terms of lower density than iron and steel and have higher strength, better corrosion resistance, and are cheaper than titanium alloys
The fatigue fracture morphology was observed by scanning electron microscopy (SEM, KYKY2008B, KYKY Technology Co., Ltd., Beijing, China), and compounds of fatigue fracture were determined by energy dispersive spectroscopy (EDS, Apollo energy spectrometer, Apollo Energy, Denver, CO, USA)
The optical microscopy (OM) and transmission electron microscopy (TEM) images of 211Z.X aluminum alloy in the as-cast and hot-rolling states are shown in Figures 2 and 3, respectively
Summary
Aluminum alloys are better in terms of lower density than iron and steel and have higher strength, better corrosion resistance, and are cheaper than titanium alloys. Aluminum alloys are widely used as lightweight materials for aircraft and vehicles [1,2,3,4]. The main alloy elements Cu, Mg, Mn, and Zn have certain strengthening effects on aluminum alloys, but their main role is to improve the heat and corrosion resistances of the material [8,13,14]. Pouraliakbar et al [21] investigated the combined effect of heat treatment and rolling on pre-strain and severe plastic deformation on aluminum alloy sheets. The data showed that aluminum alloys with high strength and toughness can be strengthened by heat treatments, and the strengths of the materials can be changed by quenching and aging processes [22,23,24]. The microstructure and distribution characteristics of the precipitates, inclusions, and other features of the two different microstructures of 211Z.X aluminum alloy before and after HCF revealed a strong effect of precipitates, inclusions, and different microstructures on HCF properties, microstructural cyclic deformation features, fatigue microcrack initiation, and propagation behaviors of 211Z.X aluminum alloys
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