摘要
Identifying the character and the source of partial dislocations associated phase transformation from a hexagonal close-packed (HCP) structure to a face-centered cubic (FCC) structure is essential for understanding phase transformation mechanisms, but was rarely done using microscopy. Here, we report a stress-induced HCP to FCC phase transformation in pure hafnium during cold rolling. Detailed transmission electron microscopy investigations revealed that transformation-related partials stemmed from the dissociation of -type dislocations. Successive gliding of partials on every other basal plane resulted in the orientation relationship between the two phases of <1120>(hcp)//<110 >(fcc), <1010>(hcp)// <112 >(fcc), and [0001](hcp)//<111 >(fcc).Besides, a new way to form a twin relationship in the FCC structure was discovered.
- 出版日期2017-6-1
- 单位粉末冶金国家重点实验室; 中南大学