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Phase transformations and microstructure evolutions in metastable beta titanium alloy Ti-B19

Abstract : The phase transformations and microstructure evolutions has been characterized for different thermal treatments, and the relationships between final microstrures and properties have been investigated in the new metastable Ti-B19 alloy. The isothermal phase transformation kinetics and the influence of different heat treatment phaths have been establisheb by using in-situ electrical Resistivity. The structures have been determined by synchrotron X-Ray Diffraction and the microstructures were observed by SEM and TEM. The results show that phase transformation kinetics and microstructure characteristics are strongly dependent on the aging temperature (ranging from 300 to 700°C). The global isothermal phase transformation phase transformation kinetics has been got and anallyzed with JMAK equation, and the TTT diagram of Ti-B19 alloy has been established. We have also shown that the heating rate has remarkable influence on the isothermal phase transformation behaviors and the pre-deformation accelerates the transformation kinetics. The microstructure evolutions during cooling are obviously dependent on the cooling rates. A first attempt has been made to calculate the transformation kinetics during cooling using JMAK law and Scheil principle. Finally, the relationship between mechanical properties and microstructure has been discussed.
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Submitted on : Thursday, March 29, 2018 - 12:16:30 PM
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Hui Chang. Phase transformations and microstructure evolutions in metastable beta titanium alloy Ti-B19. Other. Institut National Polytechnique de Lorraine, 2010. English. ⟨NNT : 2010INPL053N⟩. ⟨tel-01749447⟩



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