科研之友
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摘要
The cold upset deformation behavior of as-annealed TC16 titanium alloy samples was investigated by a fast upsetting testing machine. Mechanical properties and deformation microstructure evolutions of deformed samples were analyzed by micro-hardness tester, TEM and XRD techniques. The results show that the as-annealed TC16 titanium alloy exhibits good plasticity deformation ability without cracks at the forging ratio of 1/8. However, the strain is not uniform in the deformed samples, which produces a split shear band during cold upset deforming, while the shear band has the largest hardness value. When the forging ratio is less than or equal to 1/4 the dislocation strengthening plays a major role; otherwise, fine grain strengthening is dominant. The deformed sample shows the largest hardness gradient when the forging ratio is 1/4, indicating the mechanical properties are not steady. When the forging ratio is greater than 1/4 the mechanical properties become steady gradually.
