| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Composition–Processing–Microstructure-Property Relationships of Titanium Alloys
|
| Presentation Title |
Deformation and Fracture at Basal Twist Grain Boundaries In Ti-6Al-4V |
| Author(s) |
Thomas Yvinec, Valery Valle, Florence Hamon, Djafar Iabadden, Julien Guénolé, Samuel Hemery |
| On-Site Speaker (Planned) |
Samuel Hemery |
| Abstract Scope |
Recent investigations of fatigue failures highlighted crack nucleation at basal twist grain boundaries (BTGBs) in α+β titanium alloys. Preliminary slip activity is generally acknowledged as a critical step due to irreversible deformation eventually leading to fatigue crack formation. A prior study highlighted that early slip activity can proceed at these specific microstructure configurations, however insufficient understanding of underlying mechanisms and critical features was reported. The presently reported study addresses this gap of knowledge. A thorough characterization of deformation and fracture at a selection of BTGBs was carried out using in-situ SEM tensile tests combined with high resolution digital image correlation. The collected dataset was analyzed to identify features leading to the most critical configurations. Atomistic simulations were performed to provide additional information about the grain boundary structure, and clarify underlying mechanisms. |