In-situ X-ray diffraction studies of slip and twinning in the presence of precipitates in AZ91 alloy

Kada, Sitarama R., Lynch, Peter A., Kimpton, Justin A. and Barnett, Matthew R. 2016, In-situ X-ray diffraction studies of slip and twinning in the presence of precipitates in AZ91 alloy, Acta materialia, vol. 119, pp. 145-156, doi: 10.1016/j.actamat.2016.08.022.

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Title In-situ X-ray diffraction studies of slip and twinning in the presence of precipitates in AZ91 alloy
Author(s) Kada, Sitarama R.ORCID iD for Kada, Sitarama R. orcid.org/0000-0002-4023-1562
Lynch, Peter A.
Kimpton, Justin A.
Barnett, Matthew R.ORCID iD for Barnett, Matthew R. orcid.org/0000-0001-8287-9044
Journal name Acta materialia
Volume number 119
Start page 145
End page 156
Total pages 12
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2016-10-15
ISSN 1359-6454
1873-2453
Keyword(s) insitu X-ray diffraction
magnesium
precipitates
twinning
backstress
Summary The effect of basal plate precipitates on the hardening of basal slip and {101¯2} twinning modes was investigated for a non-aged and aged AZ91 alloy in the twin dominated strain paths. Exploiting in-situ synchrotron and laboratory based X-ray diffraction methodologies, we quantified the critical resolved shear stress (CRSS) for basal slip and twinning modes. The twin volume fraction changes were quantified from the intensity changes with applied load. We observed that the twin volume fraction changes with plastic strain is sensitive to the initial texture, while the relative hardening of different deformation modes are considered as a secondary effect. We also found that the twin interior stresses were significantly smaller and consistent with the high twin back stresses in the presence of precipitates. We propose, based on a simple analytical equation, that the leading edge of the propagating twin have a Burgers vector equivalent to 100 twinning dislocations and when the propagating twin is blocked by a precipitate, relatively high resolved stress is required for bowing the twin dislocation and hence the propagation of the twin occurs by the dissociation of the leading edge of the twinning dislocation.
Language eng
DOI 10.1016/j.actamat.2016.08.022
Field of Research 091207 Metals and Alloy Materials
0912 Materials Engineering
0913 Mechanical Engineering
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, Acta Materialia
Persistent URL http://hdl.handle.net/10536/DRO/DU:30085776

Document type: Journal Article
Collection: Institute for Frontier Materials
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