About this Abstract |
Meeting |
MS&T21: Materials Science & Technology
|
Symposium
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Processing—Microstructure—Property Relationships of Titanium and Titanium Alloys
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Presentation Title |
Nano-scale O” Phase and Fine-scale Alpha Precipitation in a Metastable Beta Ti-5Al-5Mo-5V-3Cr Alloy |
Author(s) |
Dian Li, Stoichko Antonov, Rongpei Shi, Zachary Kloenne, Hamish Fraser, Yufeng Zheng |
On-Site Speaker (Planned) |
Yufeng Zheng |
Abstract Scope |
The microstructures in metastable beta titanium alloys mainly contain the hcp alpha precipitates and the bcc beta matrix, generated by the precipitation reaction during the aging treatment. In general, alpha precipitates prefer to nucleate along the beta grain boundary and form a thick layer of grain boundary alpha microstructure. However, by introducing nano-scale particles into the interior of beta grains, fine-scale intragranular alpha microstructures can be produced in the metastable beta titanium alloys. In this work, the characterization of nano-scale ordered O” phase and the influence of nano-scale O” phase on subsequent alpha precipitation in a metastable beta Ti-5Al-5Mo-5V-3Cr alloy will be introduced. The structure and composition of O” particles was investigated using aberration-corrected S/TEM and atom probe tomography. The driving force from these O” phase particles for the subsequent alpha precipitation was studied using CALPHAD. The fine-scale intragranular alpha microstructure produced will be discussed in detail. |