Thermal Stability of an Mg–Nd Alloy Processed by High‐Pressure Torsion. Issue 12 (26th September 2019)

• Record Type: Journal Article
• Authors: Tighiouaret, Samia; Lachhab, Rabeb; Hanna, Abdelkader; Azzeddine, Hiba; Huang, Yi; Baudin, Thierry; Helbert, Anne-Laure; Brisset, François; Bradai, Djamel; Langdon, Terence G.
• Is Part Of: Advanced engineering materials. Volume 21:Issue 12(2019)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2019-09-26
• Subjects: high-pressure torsion -- Mg–RE alloys -- microstructures -- recrystallization -- textures; Materials -- Periodicals; 620.11
• DOI: 10.1002/adem.201900801
• Languages: English
• ISSNs: 1438-1656

Abstract

Abstract : The evolution of microstructure, texture, and mechanical properties of an Mg–1.43Nd (wt%) alloy is investigated after processing by high‐pressure torsion at room temperature through five turns and isochronal annealing for 1 h at 150, 250, 350, and 450 °C using electron backscatter diffraction and Vickers microhardness. The alloy exhibits a good thermal stability up to annealing at 250 °C, with mean grain size of ≈0.65 μm. The microhardness shows an initial hardening after annealing at 150 °C and then a subsequent softening. The deformation texture, a basal texture shifted 60° away from the shear direction (SD), is retained during annealing up to 250 °C. In contrast, a basal texture with symmetrical splitting toward SD is developed after annealing at 350 °C. The precipitation sequence and their pinning effects are responsible for the age‐hardening, stabilization of grain size, and the texture modification. The kinetics of grain growth in the Mg–1.43Nd alloy follows two stages depending on the temperature annealing range, with an activation energy of ≈26 kJ mol −1 in the low temperature range of 150–250 °C and ≈147 kJ mol −1 in the high temperature range of 250–450 °C. Abstract : The thermal stability of an Mg–1.43Nd alloy is investigated after high‐pressure torsion processing and subjecting to isochronal annealing ranging from 150 to 450 °C. The grain size and the texture remain stable on annealing up to 250 °C but change considerably after 450 °C. The kinetics of grain growth follows two stages depending on the temperature annealing range.