Modeling continuous dynamic recrystallization of lightweight alloys by coupling polycrystal plasticity approach. Issue 1 (June 2021)

• Record Type: Journal Article
• Authors: Chen, S F; Zhang, S H; Song, H W; Lee, M G
• Is Part Of: IOP conference series. Volume 1157:Issue 1(2021)
• Publication Date: 2021-06
• Subjects: Materials science -- Periodicals; 620.1105
• DOI: 10.1088/1757-899X/1157/1/012068
• Languages: English
• ISSNs: 1757-8981

Abstract

Abstract: In the thermo-mechanical process of lightweight alloys, such as aluminum alloys, complex microstructure evolutions are inevitably involved via the continuous dynamic recrystallization (CDRX) featured with extensive formation of subgrains followed by progressive transition into new grains. In this study, a novel fully integrated CDRX-VPSC (visco-plastic self-consistent) model is established. First, numerical formulations for formation and rotation of subgrains are addressed by reasonably tackling the grain boundary characteristics, and also the concept of generation for CDRX grains is newly introduced. By considering these two aspects, the grain population is updated according to the complex grain boundary evolutions. In the VPSC module of the integrated modeling, the shear strain rate, dislocation density, and orientation are calculated to update the grain populations and grain sizes in the CDRX module. The validation of the proposed model is conducted by simulating the hot compression of extruded AA7075 sheet, in which the DRX mechanism is controlled by the subgrain related dynamic recovery (DRV) and CDRX. The simulated flow stresses, microstructural evolutions (grains size and DRX fractions), and texture features agree well with reported experimental observations.