Theoretical study on the (1-012) deformation twinning and cracking in coarse-grained magnesium alloys

Xie, C, Fang, Q H, Liu, X, Guo, P C, Chen, J K, Zhang, M H, Liu, Y W, Rolfe, B and Li, L X 2016, Theoretical study on the (1-012) deformation twinning and cracking in coarse-grained magnesium alloys, International journal of plasticity, vol. 82, pp. 44-61, doi: 10.1016/j.ijplas.2016.02.001.

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Title Theoretical study on the (1-012) deformation twinning and cracking in coarse-grained magnesium alloys
Author(s) Xie, C
Fang, Q H
Liu, X
Guo, P C
Chen, J K
Zhang, M H
Liu, Y W
Rolfe, BORCID iD for Rolfe, B orcid.org/0000-0001-8516-6170
Li, L X
Journal name International journal of plasticity
Volume number 82
Start page 44
End page 61
Total pages 18
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2016-07
ISSN 0749-6419
Keyword(s) A. Twinning
A. Dislocations
A. Fracture mechanisms
C. Analytical functions
Magnesium alloys
Summary This paper theoretically and systematically investigates: (1) the effect of local transformed strains within deformation twinning on twin intersection; (2) the fracture mode based on type I co-zone tensile twin intersection in coarse-grained magnesium alloys, as well as the impacts of twin intersection and grain diameter on interfacial crack nucleation along twin boundaries; and (3) the influence of the local stresses arising from the encountered twin bands on crack growth. A novel dislocation-based strain nucleus model and a Green's function method, which are applicable to any material with local transformations in which elastic properties are reasonably approximated as isotropic, are specifically employed to model the concentrated transformed strain and calculate the local stress field resulting from deformation twinning and the stress intensity factors at crack tips in the magnesium alloys, respectively. In addition, an electron backscatter diffraction (EBSD) measurement is provided for crack nucleation originating from Type I co-zone tensile twin intersection. The theoretical modeling indicates: (i) the local strains within barrier twins strongly dictate the growth of incident twins and enhance the twin propagation stress; (ii) larger grains favor brittle fracture. More specifically, the dislocation reactions and pile-ups at the junctions between tensile twins can result in interfacial crack nucleation and growth along the twin boundaries, which is a brittle fracture mode based on lower twinning stress and stress concentration in the coarse-grained magnesium alloys; and (iii) the direction of crack propagation is easily changed by high-density twin bands and twin intersections owing to the local strains.
Language eng
DOI 10.1016/j.ijplas.2016.02.001
Field of Research 090599 Civil Engineering not elsewhere classified
091299 Materials Engineering not elsewhere classified
091399 Mechanical Engineering not elsewhere classified
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2016, Elsevier
Persistent URL http://hdl.handle.net/10536/DRO/DU:30084752

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