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Study of Mechanisms for Fine Scale Alpha Phase in Beta Titanium Alloys



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The present work focuses on a study of different mechanisms to engineer homogeneously distributed fine sized alpha precipitates in the beta matrix of beta titanium alloys. The precipitation of metastable phases (such as omega phase) upon low temperature aging and their influence on alpha precipitation is studied in detail. The precipitation sequence on direct aging above the omega solvus temperature is also assessed. The structural and compositional evolution of precipitate phase is determined using multiple characterization tools (3DAP, TEM, SEM, Synchrotron XRD). The possibility of occurrence of other non-classical precipitation mechanisms that do not require heterogeneous nucleation sites are also analyzed. Lastly, the influence of interstitial element, oxygen on alpha precipitation during the oxidation of Beta 21S has been determined. The ingress of oxygen and its influence on microstructure have also been correlated to measured mechanical properties.






The present work focuses on a study of different mechanisms to engineer homogeneously distributed fine sized alpha precipitates in the beta matrix of beta titanium alloys. The precipitation of metastable phases (such as omega phase) upon low temperature aging and their influence on alpha precipitation is studied in detail. The precipitation sequence on direct aging above the omega solvus temperature is also assessed. The structural and compositional evolution of precipitate phase is determined using multiple characterization tools (3DAP, TEM, SEM, Synchrotron XRD). The possibility of occurrence of other non-classical precipitation mechanisms that do not require heterogeneous nucleation sites are also analyzed. Lastly, the influence of interstitial element, oxygen on alpha precipitation during the oxidation of Beta 21S has been determined. The ingress of oxygen and its influence on microstructure have also been correlated to measured mechanical properties.


Yufeng Zheng Robert E.A. Find many great new used options and get the best deals for Study of Mechanisms for Fine Scale Alpha Phase in Beta Titanium Alloys by Behera at the best . alpha beta and oxide phases due to phase transformations or heterogeneity have been investigated based on numerical and analytical diffusion models as well 11 12. Finegrained alloys have a greater yield drop magnitude due to a larger .


Beta Scale

Here the basic mechanism is to control alpha phase forming after fast cooling from the . Friction stir processing of a metastable titanium alloy in and phase fields. achieved by precipitation of a fine dispersion of the phase in the matrix. In pure titanium the alpha phase is stable below 882C degrees and the beta. Fine yttria fullystabilised zirconia In the bright field optical micrographs of Figure 2 the alpha phase is the light coloured phase and the beta phase is the grey coloured phase. For example it was reported . This case is usually an oxygen rich surface layer that stabilizes the alpha phase of titanium in a normally properly mixed alphabeta microstructure. Bhadeshia Titanium its Alloys Pure Titanium Pure titanium melts at 1670 C and has a density of 4.51 gcm3.


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