Liqun Niu

Abstract: The compression experiments of as-received A356 alloy were conducted at temperatures ranges from 300 to 500 °C with varying strain rates. The influence of deformation parameters on the strain softening of flow stress were researched. The observation of microstructure indicated that high temperature and large strain were favorable for dynamic recrystallization behavior. In order to improve the predictability, a modified Johnson-Cook (JC) model considering strain softening mechanism was proposed. The JC model and modified JC model were calculated according to experimental data. In contrast with the JC model, the new proposed model had the better correlation and the smaller average absolute error (1.46%). Furthermore, thermal compression experiments at constant reduction speed and finite element simulations based on the new model were performed. High consistency of load-displacement curve indicated that new model had good prediction accuracy for the A356 aluminum alloy.

TL;DR: In this paper , the photo-Fenton reaction was used for the fabrication of F-free Ti3C2 (Ff-Ti3c2) with high purity of 95%.

TL;DR: In this article, a modified Hansel-Spittel constitutive model is proposed to take the effect of strain rate on strain hardening into account, and the optimal hot processing parameters of as-cast hypoeutectic Al-Si-Mg alloy are established based on the processing maps.

TL;DR: In this article, the modified Hansel-Spittel formula is used to fit the characteristic stress points, and these are then used as divides to fitting the entire stress-strain curve using the function segment method.

TL;DR: In this article, a porosity closure model is developed by Representative Volume Element (RVE) simulations, referred to below as the stress triaxiality ratio and Lode stress parameter-based (STLB) model.