Atomistic mechanism of nucleation and growth of a face-centered orthogonal phase in small-sized single-crystalline Mo. Issue 9 (1st September 2020)

• Record Type: Journal Article
• Authors: Lu, Yan; Sun, Shiduo; Zeng, Yongpan; Deng, Qingsong; Chen, Yanhui; Li, Yangzhong; Li, Xiaoyan; Wang, Lihua; Han, Xiaodong
• Is Part Of: Materials research letters. Volume 8:Issue 9(2020)
• Page Start: 348
• Page End: 355
• Publication Date: 2020-09-01
• Subjects: In situ TEM -- body-centered cubic metals -- phase transformation -- deformation mechanism; Materials science -- Research -- Periodicals; Biomedical materials -- Research -- Periodicals; Composite materials -- Research -- Periodicals; Biomedical materials -- Research; Composite materials -- Research; Materials science -- Research; Periodicals; 620.1105
• DOI: 10.1080/21663831.2020.1764122
• Languages: English
• ISSNs: 2166-3831

Abstract

ABSTRACT: Phase transformation is an important deformation and blunting mechanism at the crack tip of body-centered cubic (BCC) metals. The BCC-to-face-centered orthogonal (FCO) transformation was only predicted by ab initio calculations. In this paper, the deformation behavior of the nano-sized single-crystalline Mo is in situ investigated in a high-resolution transmission electron microscope at room temperature. We uncover the strain-induced BCC-to-FCO phase transformation. The FCO Mo grows in a layer-by-layer fashion. It is a metastable phase after stress releasing, as confirmed by our ab initio calculation. The BCC-to-FCO phase transformation is realized via lattice shearing and shuffling. GRAPHICAL ABSTRACT: IMPACT STATEMENT: This paper provides direct in situ atomic-scale evidence of BCC–FCO phase transformation, which has never reported on the experimental level.