Improved contact load-bearing capacity of ultra-fine grained titanium : Multilayering and grading

Yang,DK, Wang,JT, Fabijanic,D, Lu,JZ and Hodgson,PD 2014, Improved contact load-bearing capacity of ultra-fine grained titanium : Multilayering and grading, Materials and Design, vol. 58, pp. 217-225, doi: 10.1016/j.matdes.2014.02.028.

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Title Improved contact load-bearing capacity of ultra-fine grained titanium : Multilayering and grading
Author(s) Yang,DK
Wang,JTORCID iD for Wang,JT
Fabijanic,DORCID iD for Fabijanic,D
Journal name Materials and Design
Volume number 58
Start page 217
End page 225
Total pages 9
Publisher Elsevier Ltd
Place of publication Amsterdam, The Netherlands
Publication date 2014-06
ISSN 0264-1275
Keyword(s) Contact load-bearing
Finite element modeling
Multilayered hierarchical structure
Science & Technology
Materials Science, Multidisciplinary
Materials Science
Summary The contact load-bearing response and surface damage resistance of multilayered hierarchical structured (MHSed) titanium were determined and compared to monolithic nanostructured titanium. The MHS structure was formed by combining cryorolling with a subsequent Surface Mechanical Attrition Treatment (SMAT) producing a surface structure consisted of an outer amorphous layer containing nanocrystals, an inner nanostructured layer and finally an ultra-fine grained core. The combination of a hard outer layer, a gradual transition layer and a compliant core results in reduced indentation depth, but a deeper and more diffuse sub-surface plastic deformation zone, compared to the monolithic nanostructured Ti. The redistribution of surface loading between the successive layers in the MHS Ti resulted in the suppression of cracking, whereas the monolithic nanograined (NG) Ti exhibited sub-surface cracks at the boundary of the plastic strain field. Finite element models with discrete layers and mechanically graded layersrepresenting the MHS system confirmed the absence of cracking and revealed a 38% decrease in shear stress in the sub-surface plastic strain field, compared to the monolithic NG Ti. Further, the mechanical gradation achieves a more gradual stress distribution which mitigates the interface failure and increases the interfacial toughness, thus providing strong resistance to loading damage. © 2014 Elsevier Ltd.
Language eng
DOI 10.1016/j.matdes.2014.02.028
Field of Research 091207 Metals and Alloy Materials
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2014, Elsevier
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Document type: Journal Article
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