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| HIGH TEMPERATURE DEFORMATION BEHAVIOR AND MICROSTRUCTURE EVOLUTION MECHANISM TRANSFORMATION IN Ti2448 ALLOY |
| TIAN Yuxing, LI Shujun, HAO Yulin, YANG Rui |
| Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016 |
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Cite this article:
TIAN Yuxing LI Shujun HAO Yulin YANG Rui. HIGH TEMPERATURE DEFORMATION BEHAVIOR AND MICROSTRUCTURE EVOLUTION MECHANISM TRANSFORMATION IN Ti2448 ALLOY. Acta Metall Sin, 2012, 48(7): 837-844.
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Abstract Ti2448 (Ti-24Nb-4Zr-8Sn, mass fraction, %) is a multifunctional β-type biomedical titanium alloy with low elastic modulus, high strength and good biocompatibility. The alloy exhibits a peculiar plastic deformation behavior at room temperature called highly localized plastic deformation. With aid of such mechanism, the initial microstructure with coarse grains can be easily refined to homogenous equiaxed microstructure with nano-sized grains by the conventional cold processing such as rolling. In the paper, its high temperature plastic deformation behavior and the corresponding microstructure evolution were investigated in the single $\beta$ phase field by varying the strain rates in the ranges of 0.001-70 s-1. The results showed that the true stress and strain rate can be described by a bilinear relation, which is in sharp contrast with the conventional Sigmoidal relation found in other β-type titanium alloys. As the strain rates less than 0.1 s-1, the alloy follows the conventional β-type titanium alloys with a high average value of strain rate sensitivity being 0.265. As the strain rates higher than 1 s-1, the true stress and strain rate can be described by another linear relation with a much small average value of strain rate sensitivity being 0.032. This is different from other alloys exhibiting gradual decrease of strain hardening with the increase of the strain rates. Microstructure observations and kinetic analyses revealed that such bilinear relation would be related to its highly localized plastic deformation behavior and dynamic recrystallization (DRX), which are triggered and enhanced at higher strain rates over 1 s-1. Although dynamic recovery (DRV) is still a key microstructure evolution mechanism of the alloy during plastic deformation in single β phase field, the increase of strain rate induces a transformation from DRV to DRX, resulting in significant grain refinement from the initial coarse grains about 80 μm to refined grains less than 3 μm. Thus, the DRX is a crucial mechanism of the Ti2448 alloy to achieve significant grain refinement during hot processing.
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Received: 05 January 2012
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