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Local hardening and asymmetric twin growth by twin-twin interactions in a Mg alloy by Krishna Yaddanapudi; Mariyappan Arul Kumar; Jiaxiang Wang; Xin Wang; Timothy J. Rupert; Enrique J. Lavernia; Julie M. Schoenung; Irene J. Beyerlein; Subhash Mahajan is a Materials Science article available to read on EtoBox.
What is Local hardening and asymmetric twin growth by twin-twin interactions in a Mg alloy about?
In this study, the role of twin-twin interactions on the distributions of local defects (e.g., dislocations) and stress fields in a magnesium alloy is investigated. A co-zone ( 10 1 ̄ 2 ) - ( 1 ̄ 012 ) tensile twin junction in a deformed Mg-3wt.%Y alloy is analyzed using transmission electron microscopy (TEM). The results show that the morphology of the impinging ( 1 ̄ 012 ) twin is asymmetric, and the non-interacting boundary of the recipient ( 10 1 ̄ 2 ) twin is irregular. Detailed analysis of TEM images reveals that type-II pyramidal [ 1 ̄ 2 1 ̄ 3 ] ( 1 2 ̄ 12 ) dislocations concentrate in the vicinity of the twin-twin junction site. The same 〈c + a〉 dislocations are also observed inside the interacting twin domains along with a few 〈a〉 dislocations. The 〈c + a〉 dislocations emanating from the impinging ( 1 ̄ 012 ) twin boundary have edge character and are extended with faults parallel to the basal plane. In contrast, the 〈c + a〉 dislocations connected to the recipient ( 10 1 ̄ 2 ) twin are predominantly screw orientation and compact. Elasto-viscoplastic fast Fourier transform based crystal plasticity calculations are performed to rationalize the observed twin morpholog
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It is typically read by researchers, students, and practitioners in Materials Science.
- Author
- Krishna Yaddanapudi; Mariyappan Arul Kumar; Jiaxiang Wang; Xin Wang; Timothy J. Rupert; Enrique J. Lavernia; Julie M. Schoenung; Irene J. Beyerlein; Subhash Mahajan
- Publisher
- Elsevier BV
- Published
- 2023
- Language
- EN
- Field
- Materials Science (Physical Sciences)