![Sample our Physical Sciences journals, sign in here to start your FREE access for 14 days]({"type":"image" , "src" : "/sda/110819/TOC-Subject-Sample-2021-Physical-Sciences.jpg"})
Abstract
Disconnections are interfacial defects with dislocation and step character; for example, twinning dislocations in homo-phase and transformation dislocations in hetero-phase materials. They play important structural roles and are classified as either ‘perfect’, separating energetically degenerate regions of interface, or ‘partial’, bounding a faulted region. In kinetic mechanisms, disconnection motion can be glissile, by conservative climb or climb. In the present paper, disconnection mobility is analyzed in terms of shear and shuffle-type atomic displacements and diffusional flux. This is applied to a sequence of hetero-phase materials with increasing structural complexity, namely the β to α transformation in Ti, θ′ precipitation in Al(Cu) and the orthorhombic to monoclinic martensitic transformation in ZrO2. A disconnection source mechanism in Ti, involving conservative climb, is also described.
1Recently moved to Institute of Science and Technology, School of Mechanical Engineering, South China University of Technology, Guangzhou 510640, China.
Acknowledgment
The authors are grateful for helpful input from I-Wei Chen and H. Khater.
Notes
1Recently moved to Institute of Science and Technology, School of Mechanical Engineering, South China University of Technology, Guangzhou 510640, China.