| About this Abstract |
| Meeting |
Materials Science & Technology 2020
|
| Symposium
|
Integration between Modeling and Experiments for Crystalline Metals: From Atomistic to Macroscopic Scales II
|
| Presentation Title |
Twinning Nucleation in Hexagonal Close-packed Crystals |
| Author(s) |
Yang He, Scott X. Mao, Zhengwu Fang |
| On-Site Speaker (Planned) |
Zhengwu Fang |
| Abstract Scope |
Design and processing of advanced lightweight structural alloys based on magnesium and titanium rely critically on a control over twinning which, however, remains elusive to date and is dependent on an explicit understanding on the twinning nucleation mechanism in hexagonal close-packed (HCP) crystals. This talk will be the in-situ high resolution transmission electron microscopy for studying the twinning nucleation in HCP crystals. The {10-12} twinning nucleation process in HCP rhenium nanocrystals is directly observed and a novel “dual-step” twinning nucleation mechanism is proposed accordingly. The findings provide much-needed high-resolution evidences to the twinning nucleation mechanism in HCP crystals, with crucial implications for engineering advanced structural alloys. |