Abstract
This article presents cyclic hardening/softening behaviors (experimental data) of the heat-treated aluminum-matrix nano-clay-composite (AlSi_N_HT6), compared to those of the piston aluminum alloy (AlSi) under strain-controlled loading. For such an objective, standard samples were fabricated by gravity and stir-casting methods. Low-cycle fatigue experiments were carried out under different strain amplitudes (0.20–0.45%) and at various temperatures (25–300°C). Obtained results implied that no obvious change was observed on material properties of aluminum alloy by reinforcements, but a decrement was observed due to increasing the temperature. Results also indicated that the increase of the temperature from 25°C to 200°C has changed the cyclic behavior of both materials (AlSi_N_HT6 and AlSi) from hardening to softening. Moreover, the temperature effect was more significant than the total strain amplitude influences in cyclic behaviors.
Highlights
Engine components are usually exposed to cyclic loadings at elevated temperatures, such as pistons and cylinder heads
Increasing the temperature led to a decrease in the amount of cyclic hardening
The rate of cyclic hardening decreased and the rate of cyclic softening increased by an increase in the temperature
Summary
Engine components are usually exposed to cyclic loadings at elevated temperatures, such as pistons and cylinder heads In these parts, aluminum-silicon alloys have been widely used, due to their proper mechanical and fatigue properties, as advantages of the material. Song et al (2011) investigated the cyclic stress–strain behavior and the low-cycle fatigue (LCF) lifetime of the cast A356 aluminum alloy. They reported the cyclic hardening behavior for the material. Li et al (2018) investigated the influence of isothermal and non-isothermal aging on the LCF behavior of the forged Al-Cu-Mg-Si aluminum alloy They demonstrated that the material exhibited cyclic stability, compared to cyclic hardening of the heattreated samples
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