Abstract
The paper presents results of the investigations on the effect of the low-temperature thermomechanical treatment on the microstructure of AlZn6Mg0.8Zr alloy (7003 alloy) and the relationships between microstructure and fatigue properties and fractography of fractured samples. Fatigue life has been determined in a mechanical test at a simple state of loading under conditions of bending as well as torsion. The development of fatigue cracking has been described based on fractography investigations of the fractured samples making use of a scanning electron microscope (SEM). It was found that the factors determining the fatigue strength of the tested alloy are the microstructure as well as the type and size of the cyclic stresses. These factors determine the fractography of fatigue samples.
Highlights
Heat and thermomechanical processing of light metal alloys, aluminum alloys for plastic working, is an effective way to increase their operating properties
The influence of low-temperature thermomechanical processing (LTMP) parameters stress amplitude from 128 to 193 MPa in case of oscillatory bending, and from 74 to 122 in case on fatigue strength of the examined alloy was analyzed in relation to the supersaturated state
The alloy subjected to the deformation of 10% during LTMP exhibits fatigue life deformation, loading of tested alloy with maximum bending stresses of 174 MPa results in obtaining equal approx. 6.40 × 104 cycles 5at maximum bending stresses of 193 MPa, whereas in case of 30%
Summary
Heat and thermomechanical processing of light metal alloys, aluminum alloys for plastic working, is an effective way to increase their operating properties. The knowledge of the fatigue characteristics of AlZn6Mg0.8Zr alloy (7003) is important due to varying loads of external forces, hydrodynamic loads in particular, and those caused by longitudinal bending moment, which are transferred by the bottom plating of high-speed surface effect vehicles Many of these characteristics have not been reported in the literature, and most often there are data on the results of fatigue tests under cyclic tensile-compressive loads. The purpose of undertaken studies was to determine the influence of diversified loading conditions during low- and high-cycle oscillatory bending and double-sided torsion on fatigue life and fatigue cracking resistance of the 7003 aluminum alloy without the addition of Cu, after low temperature thermomechanical processing
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