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Open AccessArticle

Texture Evolution and Anisotropy of Plastic Flow in Hot Compression of Extruded ZK60-T5 Magnesium Alloy Plate

1
Department of Mechanical Engineering, McMaster University, Hamilton, ON L8S 4L7, Canada
2
Department of Biomedical Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong
3
Independent Researcher, (formerly with City University of Hong Kong), No. 2/B, Vinayaka Nagar, Hebbal, Bengaluru, 560024, India
*
Author to whom correspondence should be addressed.
Currently with Marine Additive Manufacturing Centre of Excellence (MAMCE), University of New Brunswick, 15 Dineen Drive, P.O. Box 4400 Fredericton, NB, Canada.
Metals 2019, 9(11), 1170; https://doi.org/10.3390/met9111170
Received: 24 September 2019 / Revised: 20 October 2019 / Accepted: 25 October 2019 / Published: 30 October 2019
The texture evolution during hot compression of extruded ZK60A-T5 magnesium alloy plate loaded along the extrusion direction (ED) and the normal direction (ND) has been examined with the help of pole figures obtained on specimens deformed in the ranges of 200 °C to 500 °C and 0.0003 s−1 to 10 s−1. The results are interpreted in terms of the operating slip systems and mechanisms identified based on processing maps developed for the above two initial specimen orientations. The processing map for the initial ED orientation exhibited three domains. In Domains 1 and 3, first-order pyramidal slip {10 1 ¯ l} <11 2 ¯ 0> occurs, while in Domain 2, second-order pyramidal slip {11 2 ¯ 2} <11 2 ¯ 3> occurs. The pole figures obtained on specimens deformed in Domains 1 and 3 are strikingly similar, indicating that the operating slip system controls the texture evolution. Compression in Domains 1 and 3 nearly randomizes the intense basal texture in the as-received specimens, while a new texture is generated in Domain 2 with basal poles at 45° to ND or transverse direction (TD). This new texture will promote basal slip when loaded in a transverse direction. When loaded in the normal direction (ND), the processing map exhibited four domains. In Domains 1 and 4, {10 1 ¯ l} <11 2 ¯ 3> slip occurs, while {11 2 ¯ 2} <11 2 ¯ 3> slip occurs in Domains 2 and 3. The pole figures obtained from specimens deformed in Domains 1 and 4 have similar features, while those deformed in Domains 2 and 3 exhibited similar features to one another, confirming that the operating slip systems control the texture development since they are the same in each pair. The compression along ND produces strong basal textures with the basal planes normal to the ED. The texture gets intensified with increased temperature of deformation and causes strong anisotropy in mechanical properties. View Full-Text
Keywords: extruded ZK60A-T5 magnesium alloy; hot deformation; processing map; anisotropy; texture; pyramidal slip extruded ZK60A-T5 magnesium alloy; hot deformation; processing map; anisotropy; texture; pyramidal slip
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MDPI and ACS Style

Dharmendra, C.; Jain, M.K.; Prasad, Y.V.R.K.; Pitcheswara Rao, K. Texture Evolution and Anisotropy of Plastic Flow in Hot Compression of Extruded ZK60-T5 Magnesium Alloy Plate. Metals 2019, 9, 1170.

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