| About this Abstract |
| Meeting |
MS&T21: Materials Science & Technology
|
| Symposium
|
Processing—Microstructure—Property Relationships of Titanium and Titanium Alloys
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| Presentation Title |
Role of Novel Highly-indexed Twinning in Hierarchical α Microstructure in Metastable β Ti-5Al-5Mo-5V-3Cr Alloy |
| Author(s) |
Dian Li, Wenrui Zhao, Xing Zhang, Stoichko Antonov, Yiliang Liao, Yufeng Zheng |
| On-Site Speaker (Planned) |
Dian Li |
| Abstract Scope |
The mechanical properties of metastable β titanium alloys are highly dependent on the size, morphology, number density and distribution of α phase precipitates formed during different thermomechanical processings. Recent studies have shown that the α microstructure can be tuned via various pre-formed nanoscale metastable particles and interfaces in the metastable β titanium alloys. In this work, the role of highly-indexed twinning in the hierarchical α microstructure in a metastable β Ti-5Al-5Mo-5V-3Cr (wt%, Ti-5553) alloy has been investigated using scanning electron microscopy and transmission electron microscopy. A novel {10 9 3}<3 3 1>β highly-indexed twin type was generated in Ti-5553 via cold-rolling and a hierarchical α microstructure composed of coarse α layers, α sub-layers and fine-scale α precipitates was formed via accurately controlled heat treatment. The microstructure evolution pathway to form α precipitates of different size scales will be discussed in detail. |