New insight into prismatic-type face-centered cubic zirconium phase in pure zirconium
- PDF / 7,465,045 Bytes
- 7 Pages / 595.276 x 790.866 pts Page_size
- 99 Downloads / 205 Views
New insight into prismatic-type face-centered cubic zirconium phase in pure zirconium Fusen Yuan1,2, Geping Li1,*, Fuzhou Han1,2, Yingdong Zhang1,2, Ali Muhammad1,2, Wenbin Guo1,2, Jie Ren1,2, Chengze Liu1,2, and Hengfei Gu1,3 1
Shi-Changxu Innovation Center For Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, People’s Republic of China 2 School of Materials Science and Engineering, University of Science and Technology of China, Baohe District, 96 JinZhai Road, Hefei, Anhui 230026, People’s Republic of China 3 University of Chinese Academy of Sciences, 19 Yuquan Road, Beijing 100049, People’s Republic of China
Received: 3 September 2020
ABSTRACT
Accepted: 19 September 2020
Distinctive thermal-induced prismatic-type face-centered cubic zirconium phases (named c phase) were firstly reported in pure zirconium. Atomic insight was provided into the a/c interface and structure of interfacial misfit dislocations. Furthermore, we proposed the formation mechanism of this c phase. Our results revealed that the semi-coherent interface contributes to periodic extra half-plane on the c side and the volume expansion is 19.8% due to the a ? c phase transformation. More importantly, the a ? c phase transformation involved expansion and shuffle displacement.
Springer Science+Business
Media, LLC, part of Springer Nature 2020
Introduction Face-centered cubic (FCC) phases in hexagonal closepacked (HCP) matrix have been widely revealed in Ti-based alloys [1–4], Co [5], Hf [6, 7] and Zr [8, 9]. As far as the reported results, there were two orientation relationships (ORs) between these two phases: (1) \11 k \ and f0001gHCP k 1 10 [ 20 [ HCP
FCC
(2) \0001 [ HCP k \001 [ FCC and f111gFCC ; k f110g . These two ORs are commonly 0g f10 FCC 1 HCP
known as basal-type (B-type) and prismatic-type (Ptype), respectively. For B-type, the close-packed
Handling Editor: Shen Dillon.
Address correspondence to E-mail: [email protected]
https://doi.org/10.1007/s10853-020-05384-x
planes of the two phases are parallel and only stacking sequence changes during the phase transformation. Therefore, gliding of Shockley partial dislocations on every other f0001g basal planes in the HCP matrix was widely accepted as the transformation mechanism. However, in the case of P-type, as a recently reported OR, the mechanism behind it is still controversial. Hong et al. [10] concluded that Shockley partial dislocations of 6a \11 2 0 [ -type gliding on f10 1 0g prism planes. Wu et al. [1] proposed that nucleation of this FCC phase is accomplished via pure-shuffle and growth via shear-shuffle mechanism. Yang et al. [2] proposed that the HCP to
J Mater Sci
FCC prismatic transformation includes the stages of slip, adjustment and expansion. It should be noted that the three mechanisms mentioned above are both for stress-induced FCC phases. Yu et al. [4] and Ma et al. [11] observed the formation of FCC phase at elevated temperature by in situ transmission electron microscopy (TEM) technique.
Data Loading...
