Hot Deformation Behavior of PM Ni with Harmonic Microstructure

Cinzia Menapace, Bhupendra Sharma, Kei Ameyama

Research output: Contribution to journalArticlepeer-review

Abstract

The hot deformation behavior of a harmonic-structured pure nickel has been studied and compared with the hot deformability of a homogeneously structured nickel. Both materials were produced via the powder metallurgy route through the Spark Plasma Sintering (SPS) of mechanical milled and un-milled powders. Hot deformation was evaluated through compression tests at three different temperatures (400 C, 800 C, and 1300 C), covering a wide range in the homologous temperature spectrum for Ni (from 0.39 to 0.91), and at three different strain rates (0.001, 0.01, and 0.1 s−1). The evaluation of the stress–strain curves showed a higher hot compression resistance for the harmonic-structured nickel, together with higher strain hardening and strain rate sensitivity, thanks to the peculiar microstructural features of this material. Through the metallographic analysis of the specimens after hot compression, different mechanisms were identified as responsible for the deformation behavior in relation to the temperature of testing. While at 400 C dynamic recrystalliza-tion has slightly started, at 800 C it is widely diffused, and at 1300 C it is replaced by grain growth and diffusion creep phenomena.

Original languageEnglish
Article number90
JournalMetals
Volume12
Issue number1
DOIs
Publication statusPublished - Jan 2022
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Metals and Alloys

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