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1

Superplasticity studies in a beta titanium alloy

Tan M. J., Zhu X. J., Thiruvarudchelvan S., Liew K. M.

Archives of Materials Science and Engineering

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2007

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Vol. 28, nr 12

717-721

EN

Purpose: In the present study, the Superplastic Forming and deformation behavior as well as related mechanisms of this titanium alloy were investigated. Design/methodology/approach: The high temperature deformation of a beta titanium alloy (Ti-15V-3Cr-3Sn-3Al) was studied in this work. Uniaxial tensile tests were carried out at 650, 750, 850 and 950°C with an initial strain rates from 10 -1 s -1 to 10 -4 s -1. The effects of temperatures and initial strain rates on the superplasticity of this alloy were studied. Findings: The studies showed that dynamic recrystallization took place during high temperature deformation and this process not only decrease the average grain size of the alloy but also increase the misorientation angle. Microstructure evolution during high temperature forming as well as related mechanisms were also investigated. Practical implications: The investigation of microstructure of beta titanium alloy as related phenomens during high temperature deformation are important for achieving desired mechanical behavior of the material. Originality/value: The Superplasticity studies in a beta titanium alloy as well as related mechanism are investigated.

2

Microstructure evolution of CP titanium during high temperature deformation

Tan M. J., Zhu X. J.

Archives of Materials Science and Engineering

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2007

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Vol. 28, nr 1

5-11

EN

Purpose: To investigate the superplasticity of commercially pure titanium alloy and microstructure evolution of the alloy during high temperature deformation. Design/methodology/approach: Uniaxial tensile tests were carried out at 600, 750 and 800°C with an initial strain rate from 10 -1 s -1 10 -4 s -1. EBSD technology was used to evaluate the microstructure of the commercially pure titanium alloy deformed at high temperature. Findings: It is found that this titanium alloy does not show good superplasticity at 600-800°C due to the rapid grain growth. Studies also show that the dynamic recrystallization took place at high temperatures. The optimum dynamic recrystallization conditions were found to be at 600°C with an initial strain rate of 0.001/s, attaining the highest volume fraction of fine grains whose average grain size is ≈ 9.7 µm at strain of 80%. This process not only decreases the average grain size of the alloy but also increase the misorientation angle of the grain boundary. Practical implications: The investigations of microstructure of the commercially pure titanium alloy as well as related phenomena during high temperature deformation are important for achieving desired mechanical behavior of the material. Originality/value: The dynamic recrystallization phenomenon of commercially pure titanium alloy as well as related mechanism is investigated.

3

Dynamic recrystallization in commercially pure titanium

Tan M. J., Zhu X. J.

Journal of Achievements in Materials and Manufacturing Engineering

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2006

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Vol. 18, nr 1-2

183--186

EN

Purpose: A study was conducted to investigate the dynamic recrystallization of commercially pure Titanium alloy during high temperature deformation in order to understand it further and enable expansion of its usage. Design/methodology/approach: Uniaxial tensile tests were carried out at 600, 750 and 800°C with different initial strain rates. Microstructure evolution during high temperature tensile testing was studied by using optical microscope and Electron Back Scattered Diffraction. Findings: It is found that this titanium alloys do not show good superplasticity at 600-800°C due to the rapid grain growth. Studies also show that the dynamic recrystallization took place at high temperatures. This process not only decreases the average grain size of the alloy but also increase the misorientation angle of the grain boundary. Practical implications: The investigations of dynamic recrystallization of commercially pure titanium alloy as well as related phenomena are important for achieving desired mechanical behavior of the material. Originality/value: The dynamic recrystallization phenomenon of commercially pure titanium alloy as well as related mechanism is investigated.