title: Dislocation "Bubble-Like-Effect" and the Ambient Temperature Super-plastic Elongation of Body-centred Cubic Single Crystalline Molybdenum.
abstract: With our recently developed deformation device, the in situ tensile tests of single crystal molybdenum nanowires with various size and aspect ratio were conducted inside a transmission electron microscope (TEM). We report an unusual ambient temperature (close to room temperature) super-plastic elongation above 127% on single crystal body-centred cubic (bcc) molybdenum nanowires with an optimized aspect ratio and size. A novel dislocation "bubble-like-effect" was uncovered for leading to the homogeneous, large and super-plastic elongation strain in the bcc Mo nanowires. The dislocation bubble-like-effect refers to the process of dislocation nucleation and annihilation, which likes the nucleation and annihilation process of the water bubbles. A significant plastic deformation dependence on the sample's aspect ratio and size was revealed. The atomic scale TEM observations also demonstrated that a single crystal to poly-crystal transition and a bcc to face-centred cubic phase transformation took place, which assisted the plastic deformation of Mo in small scale.
authors.affiliation: Beijing Key Lab and Institute of Microstructure and Properties of Advanced Materials, Beijing University of Technology, Beijing, 100124, China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Lu
authors.affiliation: Beijing Key Lab and Institute of Microstructure and Properties of Advanced Materials, Beijing University of Technology, Beijing, 100124, China.
authors.forename: Sisi
authors.initials: S
authors.lastname: Xiang
authors.affiliation: Beijing Key Lab and Institute of Microstructure and Properties of Advanced Materials, Beijing University of Technology, Beijing, 100124, China.
authors.forename: Lirong
authors.initials: L
authors.lastname: Xiao
authors.affiliation: Beijing Key Lab and Institute of Microstructure and Properties of Advanced Materials, Beijing University of Technology, Beijing, 100124, China.
authors.forename: Lihua
authors.initials: L
authors.lastname: Wang
authors.affiliation: Beijing Key Lab and Institute of Microstructure and Properties of Advanced Materials, Beijing University of Technology, Beijing, 100124, China.
authors.forename: Qingsong
authors.initials: Q
authors.lastname: Deng
authors.affiliation: Beijing Key Lab and Institute of Microstructure and Properties of Advanced Materials, Beijing University of Technology, Beijing, 100124, China.|Department of Materials Science, State Key Lab of Si Materials, Zhejiang University, Hangzhou, Zhejiang, 310058, China.
authors.forename: Ze
authors.initials: Z
authors.lastname: Zhang
authors.affiliation: Beijing Key Lab and Institute of Microstructure and Properties of Advanced Materials, Beijing University of Technology, Beijing, 100124, China.
authors.forename: Xiaodong
authors.initials: X
authors.lastname: Han