Mechanical Anisotropy Induced by Strain Path Change for AZ31 Mg Alloy Sheet
| Autor: | Chunyan Zha, Chong Yang, Baodong Shi, Dan Meng, Yan Peng, Mei Yibing, Guoguo Zhu, Liu Shengwei, Lu Wu |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
lcsh:TN1-997 Materials science Strain (chemistry) Tension (physics) Metals and Alloys Forming processes 02 engineering and technology anisotropy Flow stress 021001 nanoscience & nanotechnology 01 natural sciences strain path changes 0103 physical sciences Coupling (piping) General Materials Science Texture (crystalline) heterogeneous Composite material Deformation (engineering) 0210 nano-technology Anisotropy Mg alloy texture lcsh:Mining engineering. Metallurgy |
| Zdroj: | Metals Volume 10 Issue 8 Metals, Vol 10, Iss 1049, p 1049 (2020) |
| ISSN: | 2075-4701 |
| DOI: | 10.3390/met10081049 |
| Popis: | The variation of strain paths induces anisotropy during practical sheet forming processes, which is very important for the subsequent processing technology of anisotropic Mg alloys. In this study, two-step loading tests (tension-tension) were performed to clarify the effect of strain path changes on the evolution of anisotropy on rolled AZ31 sheet. Specimens were preloaded with tension along the rolling direction (RD) with 9% of prestrain. Then, second tension was conducted along 0° 30° 45° 60° and 90° from the RD. It was found that yield strength during the second loading increased along the same direction compared to uniaxial tension without prestraining. For the second loading, the yield strength and flow stress decreased with the increase of the angle from the RD. It was found that the strain path change resulted in stronger anisotropy than that induced by texture. Moreover, it was found that the main deformation modes were basal and prismatic slips during the second loading based on visco-plastic self-consistent (VPSC) modeling. The relative activities of basal and prismatic slips were affected by the second loading direction due to texture evolution. The mechanical anisotropy induced by strain path changes was ascribed to the coupling of the heterogeneous distribution of dislocations and texture evolution induced by prestraining. |
| Databáze: | OpenAIRE |
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