Abstract
TA32 is a heat-resistant titanium alloy developed for superplastic forming in fabrication of near-space supersonic aerocraft. Clarification of superplastic deformation behavior is important to the optimization of forming parameters. Superplastic tensile test was conducted in vacuum to eliminate the effect of surface oxidation on experimental data, the test temperature and strain rate varied from 900oC to 960oC and 5.32×10-4 to 2.08×10-2s-1, respectively. It was observed that the size of equiaxed α grains exhibited a trend of coarsening with the increase of temperature and decrease of strain rate. Textures of deformed specimens exhibited random distribution with a decreased texture intensity compared with the as-received materials. The superplastic deformation mechanism of TA32 alloy was dominated by grain boundary sliding, which is accommodated by grain rotation and dynamic recrystallization.
Highlights
As the excellent combination properties such as high ratio of strength to weight, superior high temperature resistance, remarkable corrosion resistance and so on, titanium and its alloys have been widely applied in aviation, aerospace, marine and biomedical fields [1]
A equiaxed structure composed of primary α phases and thin β phases was observed and the size of average primary equiaxed α phase was measured to be approximately 2.1 μm
The superplastic deformation properties of a near α titanium alloy TA32 was investigated in vacuum environment and the results could be summarized as follows: 1. Vacuum environment can effectively prevent the material from being oxidized
Summary
As the excellent combination properties such as high ratio of strength to weight, superior high temperature resistance, remarkable corrosion resistance and so on, titanium and its alloys have been widely applied in aviation, aerospace, marine and biomedical fields [1]. To broaden the application fields of titanium alloys, especially in the aerospace industry, extensive researches on superplastic forming (SPF) of titanium alloys have been carried out [2,3,4,5]. The advantages of SPF are as follows: saving materials and improving product quality, increasing strength and reducing final weight of the components, improving the life of die and achieving very complex shape parts [6]. It is urgently necessary that SPF is applied on titanium alloys. Anti-oxidation coating is applied on the surface of test samples in most experiments, the inevitable oxidation will create some degree of distortion on the experimental data
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