|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Ultrafine-grained and Heterostructured Materials (UFGH XII)
||Effect of Processing Temperature on the Microstructure and Mechanical Properties Changes of High-pressure Torsion Processed Al7075 Alloy
||Juhee Oh, Sangeun Park, Hyo Ju Bae, Sujung Son, Hyoung Seop Kim, Jae Bok Seol, Hyokyung Sung, Jung Gi Kim
|On-Site Speaker (Planned)
Severe plastic deformation at an elevated temperature results into the complex microstructure including dynamic recovery and solute migration. Especially, low-melting temperature alloys (e.g. aluminum and magnesium) are sensitive to additional heat energy that results into the abnormal grain growth or dynamic precipitations during severe plastic deformation. In this study, the mechanical properties and microstructural evolution of high-pressure torsion-processed aluminum 7075 alloy at a high temperature are investigated. In the early deformation stage, both grain refinement and nano-precipitates are formed that increase the strength of ultrafine-grained aluminum alloy. In the later deformation stage, however, strength decreases due to the grain growth and coarse precipitates act as crack initiation sites during plastic deformation. This result shows the additional heat during high-pressure torsion accelerates precipitation behavior in the matrix, and the generated precipitations contribute to the mechanical property of ultrafine-grained bulk metallic alloys.
||Aluminum, Mechanical Properties, Other