Analysis of Abnormal Texture and Strengthening Mechanisms of Extruded Mg–Gd–Y–Nd–Zr Alloy. Issue 3 (31st October 2022)

• Record Type: Journal Article
• Authors: Gao, Zexi; Liu, Chuming; Jiang, Shunong; Gao, Yonghao; Wan, Yingchun; Chen, Zhiyong
• Is Part Of: Advanced engineering materials. Volume 25:Issue 3(2023)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-10-31
• Subjects: abnormal texture -- grain growth -- mechanical properties -- Mg–Gd–Y–Nd–Zr; Materials -- Periodicals; 620.11
• DOI: 10.1002/adem.202201046
• Languages: English
• ISSNs: 1438-1656

Abstract

Abstract : The formation mechanism of an abnormal texture with <0001> orientation parallel to the extrusion direction (<0001>//ED) and strengthening mechanisms in the extruded Mg–Gd–Y–Nd–Zr alloy are investigated. When extruded at a ratio of 25, the abnormal texture is accompanied by a completely dynamic recrystallized (DRXed) microstructure, and its intensity increases with increasing extrusion temperature. When the extrusion ratio is reduced to 9, the multiple texture components are formed, accompanied by nonuniform microstructures. Rare‐earth (RE) elements segregating at the grain boundary or existing as a secondary phase affect the activation of nonbasal slips and preferential growth of DRXed grains. The formation mechanisms of abnormal texture are completed DRX, the operation of pyramidal < c + a > slip, and growth advantage. The strengthening mechanisms in the extruded Mg–Gd–Y–Nd–Zr alloy mainly include solid solution strengthening, grain boundary strengthening, and precipitate strengthening, among which solid solution strengthening plays a key role. The trade‐off between the three strengthening mechanisms results in the stability of the mechanical properties of the extruded Mg–Gd–Y–Nd–Zr alloy under various extrusion conditions. Abstract : The activation of basal and nonbasal slips results in the formation of weak multiple texture components with containing abnormal texture (<0001>//ED). The <0001>//ED oriented grains exhibit preferential growth at an elevated extrusion temperature. The abnormal texture with <0001>//ED orientation results from the combined effects of alloying elements, complete dynamic recrystallization (DRX), deformation modes, and the preferential growth of DRXed grains.