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Abstract <p>The structural evolution and calorimetric response of nickel processed by high-pressure torsion at 20 and 150°C have been investigated. The number of heat release peaks on the DSC curve depends on the deformation temperature. A single peak is observed after deformation at 20°C, and it is attributed to low-temperature recrystallization of microcrystallites. Multiple peaks emerge after deformation at 150°C. The dominant peak corresponds to low-temperature recrystallization initiated at dynamically recrystallized grains with low dislocation number density. A secondary peak at higher temperatures results from primary recrystallization, which is driven by thermally activated nucleation and growth. The conditions necessary for forming a stable bimodal structure have been identified. In this structure, low-temperature recrystallization occurs after high-temperature deformation. Nucleation centers progress from microcrystallites to dynamically recrystallized grains.</p>

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Differential Scanning Calorimetry Study of Relaxation Processes in Nickel Deformed by Shear under Pressure at 20 and 150°C

  • 期刊论文

  • 发表日期：

    2025年7月1日

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  • K. Yu. Karamyshev,
  • T. I. Chashchukhina,
  • L. M. Voronova,
  • M. V. Degtyarev,
  • N. N. Resnina

摘要

Abstract

The structural evolution and calorimetric response of nickel processed by high-pressure torsion at 20 and 150°C have been investigated. The number of heat release peaks on the DSC curve depends on the deformation temperature. A single peak is observed after deformation at 20°C, and it is attributed to low-temperature recrystallization of microcrystallites. Multiple peaks emerge after deformation at 150°C. The dominant peak corresponds to low-temperature recrystallization initiated at dynamically recrystallized grains with low dislocation number density. A secondary peak at higher temperatures results from primary recrystallization, which is driven by thermally activated nucleation and growth. The conditions necessary for forming a stable bimodal structure have been identified. In this structure, low-temperature recrystallization occurs after high-temperature deformation. Nucleation centers progress from microcrystallites to dynamically recrystallized grains.