Proposed mechanism of twin formation during hexagonal-close-packed structure to face-centered-cubic phase transition. (December 2018)

• Record Type: Journal Article
• Authors: Yang, J.X.; Liu, L.C.; Gong, H.R.; Song, M.
• Is Part Of: Solid state communications. Volume 284/286(2018)
• Page Start: 40
• Page End: 44
• Publication Date: 2018-12
• Subjects: HCP metals -- Twin formation -- HCP→FCC phase transition -- First principles calculation; Solid state chemistry -- Periodicals; Solid state physics -- Periodicals; Chimie de l'état solide -- Périodiques; Physique de l'état solide -- Périodiques; 530.41
• DOI: 10.1016/j.ssc.2018.08.011
• Languages: English
• ISSNs: 0038-1098

Abstract

Abstract: Detailed process, critical energy, and critical shear stress of twin formation during hexagonal-close-packed (HCP) to face-centered-cubic (FCC) transition are proposed through first principles calculation. It reveals that a lower critical energy is needed for HCP→FCC basal transition with twin formation than that without twin. The relative magnitude of critical shear stresses is strongly correlated with c / a ratio of HCP metals, and fundamentally determines the appearance of HCP→FCC basal transition and phase-transition twin. The predicted results bring about reasonable explanations to two puzzling points regarding Mg and twin formation in the literature. Highlights: Mechanism of twin formation in HCP-FCC transition is proposed. Lower driving force is for HCP→FCC basal transition with twin. Critical shear stress is strongly correlated with the c / a ratio of HCP. Shear stress determines HCP→FCC basal transition with twin. Results explain two puzzling points regarding Mg and twin formation.