Abstract
The low-temperature superplastic tensile behavior and the deformation mechanisms of Ti-6Al-4V alloy are investigated in this paper. Through the experiments carried out, elongation to failure (δ) is calculated and a set of values are derived that subsequently includes the strain rate sensitivity exponent (m), deformation activation energy (Q) at low-temperature superplastic deformation, and the variation of δ, m and Q at different strain rates and temperatures. Microstructures are observed before and after superplastic deformation. The deformation mechanism maps incorporating the density of dislocations inside grains at temperatures of 973 and 1123 K are drawn respectively. By applying the elevated temperature deformation mechanism maps based on Burgers vector compensated grain size and modulus compensated stress, the dislocation quantities and low-temperature superplastic deformation mechanisms of Ti-6Al-4V alloy at different temperatures within appropriate processing regime are elucidated.
Highlights
The two-phase α-β Ti-6Al-4V alloy has been widely used for aerospace applications because of an attractive combination of properties such as high specific strength, relatively excellent fracture toughness, and strong heat and corrosion resistance [1,2,3]
The alloy is rather difficult to form into a complex shape at room temperature because of its poor formability, and the characterization of the deformation behavior during superplastic forming is essential for optimizing hot forged processes of titanium alloys [4]
Ashby [6] introduced a deformation mechanism map showing the area of dominant flow mechanisms in the plot of normalized stress vs. temperature for a given grain size to predict creep deformation of tungsten filament in bulb
Summary
The two-phase α-β Ti-6Al-4V alloy has been widely used for aerospace applications because of an attractive combination of properties such as high specific strength, relatively excellent fracture toughness, and strong heat and corrosion resistance [1,2,3]. The oxidation resistance of conventional titanium alloys decreases sharply during high-temperature superplasticity [5]. There is still little research that concerns the low-temperature superplasticity and deformation mechanism of the Ti-6Al-4V alloy. Constructed a deformation mechanism map as a function of strain size, stress, and temperature. Little work has discussed the has deformation map mechanism map incorporating a dislocation incorporating a dislocation quantity inside thequantity grains. The dislocation creep mechanism map ofmap a solid alloy alloy was was ascertained byregimes; two regimes;. Is necessaryit to construct new type of mechanism deformationmap mechanism for solid solution alloys. Ti-6Al-4V alloy was investigated on the basis of the flow curves measured during tensile testsat deformation mechanism mechanism map map atdifferent differenttensile tensiletemperatures temperatureswith with different different strain strain rates. The part gauge of the superplastic tensile specimens wasin6width, mm in width, in 2 mmand in thickness, shown inas
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