Effect of Electric Field-Assisted Heat Treatment on Microstructure and Phase Transformation of Zrtialv Alloy

• Published in: Metals and materials international Vol. 29; no. 8; pp. 2137 - 2150
• Main Authors: Zhang, Chunxiang, Xue, Hao, Xing, Shiping, Luo, Junting
• Format: Journal Article
• Language: English
• Published: Seoul The Korean Institute of Metals and Materials 01.08.2023; Springer Nature B.V; 대한금속·재료학회
• Subjects: Alloys; Beta phase; Characterization and Evaluation of Materials; Chemistry and Materials Science; Crystal defects; Electric fields; Engineering Thermodynamics; Grain growth; Heat and Mass Transfer; Heat treating; Heat treatment; Machines; Magnetic Materials; Magnetism; Manufacturing; Materials Science; Metallic Materials; Microstructure; Phase transitions; Plastic deformation; Processes; Solid Mechanics; Stacking faults; 재료공학; Electric field-assisted heat treatment; Phase transition mechanism; ZrTiAlV alloy; Severe plastic deformation
• ISSN: 1598-9623; 2005-4149
• DOI: 10.1007/s12540-022-01366-7

The electric field-assisted (EFA) heat treatment is proposed to solve the problem of excessive grain growth of β phase during the heat treatment of ZrTiAlV alloy. The effect of the EFA heat treatment process on the phase transformation and microstructure of the as-forged and severe plastic deformation (SPD) alloys are studied. For the as-forged 47Zr alloy, the pure β phase can be obtained by holding at 700 °C for 5 min. After SPD, the increase in defect concentration in the alloy reduces the effectiveness of the EFA heat treatment, and required an extension of the holding time to 15 min to obtain a pure β phase. Furthermore, a new mechanism for the transition of needle-like α phase to β phase is proposed. Dislocations in the β-phase matrix shear the needle-like α phase, resulting in the formation of a large number of stacking faults inside it, which are then transformed into the β phase through atomic plane slippage. Graphical Abstract