Abstract
The hot deformation behavior of Ti-10V-2Fe-3Al alloy obtained by the powder metallurgy (PM) method was investigated. Material for the research was produced by blending of elemental powders followed by uniaxial hot pressing. Thermomechanical tests of Ti-10V-2Fe-3Al compacts were carried out to determinate the stress-strain relationships at the temperature range of 800 °C to 1000 °C and strain rate between 0.01 and 10 s−1. Based on the dynamic material model (DMM) theory, processing maps at constant strain value were developed using data obtained from hot compression tests. The processing maps were elaborated for the final strain value, which was 0.9, and with flow instability criterion domains applied to it. Two critical regions associated with the flow behavior of the investigated material were revealed. Microstructural changes during hot deformation at various temperatures and strain rates were discussed. The correlation between calculated efficiency of power dissipation, flow instability criterion, and microstructure evolution was determined. The presence of defects was confirmed in regions predicted by the instability maps. The microstructure of the investigated alloy, corresponding to the high efficiency of power dissipation characterized by the occurrence of dynamic recrystallization (DRX) phenomena, was also shown. Additionally, average hardness values in relation to variable process parameters were designated. Based on the conducted studies and analysis, processing windows for Ti-10V-2Fe-3Al alloy compacts were proposed.
Highlights
LOW relative density, high specific strength, and fracture toughness, as well as good resistance to creep and corrosion, are the reasons that titanium alloys are widely used in automotive and aircraft industries
1970 by Timet Company, and Ti-5Al-5Mo-5V-3Cr (Ti-5553). Both of these alloys find their applications in the aircraft industry, especially as landing gear in the Boeing 777 series and Airbus A-380.[2,6] b titanium alloys are increasingly replacing steel components, which results in weight reduction and decreased working costs.[7]
It can be observed that the microstructure of Ti-10-2-3 alloy compact (Figure 2) was mainly composed of massive lamellar a grains in the b phase
Summary
LOW relative density, high specific strength, and fracture toughness, as well as good resistance to creep and corrosion, are the reasons that titanium alloys are widely used in automotive and aircraft industries. Such alloys are widely used in medicine as bone-replacement prosthesis and dental implants and instruments due to the biocompatibility of titanium.[1,2,3,4] b titanium alloys show favorable strength to density ratio, combined with good ductility and attractive processing features such as deep hardenability and forging performance.[5] Nowadays, the most often applied b titanium alloys are Ti-10V-2Fe-3Al (Ti-10-2-3), developed in Manuscript submitted April 26, 2019. Different approaches, such as hot isostatic pressing of gas-atomized powder,[9,10] hot or cold pressing followed by sintering of blended elemental powders (BEPM),[11,12,13,14] and novel selective laser melting techniques, are proposed to prepare titanium alloy with
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