hot deformation behavior and microstructural evolution characteristics of ti-44al-5v-1cr alloy containing (γ + α2 + b2) phases

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ID: 177650
2016
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Abstract
The hot deformation behavior and microstructural evolution of Ti-44Al-5V-1Cr alloy were investigated by hot compression tests at temperatures of 1000–1250 °C and strain rates of 0.001–1 s−1. It was indicated that the dependence of peak stress on deformation temperature and strain rate could be accurately described by a hyperbolic sine type equation. The activation energy, Q, was estimated to be 632 kJ/mol. The hot processing map was developed at different strains on the basis of dynamic materials modeling and the Murty criteria. As a result, the instability zones occurred in the regions of low temperature (<1050 °C) and a high strain rate (>0.1 s−1). The flow soft mechanism of the instability regions is stress relaxation caused by localization deformation at lamellar boundaries. Dynamic recrystallization is the mainly refining and spheroidizing mechanism of lamellar microstructures. The optimum hot working condition of as-cast TiAl alloy occurs in the temperature range of 1175–1225 °C and the strain rate range 0.05–0.1 s−1. The large-size TiAl alloy rectangular bars with crack-free appearance were successfully prepared by hot extrusion. After annealing, the fine and uniform microstructure with excellent deformation ability was obtained.
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liu2016metalshot Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Hongwu Liu;Rong Rong;Fan Gao;Zhenxi Li;Yanguo Liu;Qingfeng Wang
Journal seminars in cancer biology
Year 2016
DOI
10.3390/met6120305
URL
http://www.mdpi.com/2075-4701/6/12/305
Keywords
microstructure dynamic recrystallization metallurgy

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