Constitutive modelling and microscopic analysis of TC4 alloy sheet at elevated temperature

Publication date: June 2019Source: Results in Physics, Volume 13Author(s): Hui Wang, Kongxun Zhao, Xingrong Chu, Bing Zhao, Jun GaoAbstractTensile tests of TC4 alloy sheet were performed at elevated temperatures to explore the deformation behaviors under different conditions. The deformation conditions were determined by four temperatures 600 °C, 650 °C, 700 °C and 750 °C, and each temperature corresponds to four strain rates (i.e. 0.005 s−1, 0.01 s−1, 0.05 s−1 and 0.1 s−1), respectively. Based on the obtained deformation behaviors, two constitutive models were established. It was found that although the two models both showed good prediction accuracy, the modified Johnson-Cook (JC) model was more accurate than the strain compensated Arrhenius model. The effect of the forming conditions on the deformation behavior of TC4 alloy sheet was studied by means of microscopic analysis. The microstructure analysis showed that the content of β phase played an important role in the thermoplastic deformation of TC4 alloy. The fracture morphology of the specimen was also affected by the forming conditions. The high temperature and low strain rate contributed to the increase of number and depth of dimples.Graphical abstract
Source: Results in Physics - Category: Physics Source Type: research
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