Effect of hot pressing and hot isostatic pressing on the microstructure, hardness, and wear behavior of nickel

Carola Martínez, Francisco Briones, Claudio Aguilar, Nicolás Araya, Iñigo Iturriza, Izabel Machado, Paula Rojas

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Nanocrystalline Ni (Ninc) obtained by mechanical milling may present improved mechanical properties paired with high abrasion resistance. Different sintering processes were used to consolidate Nanocrystaline Ni: hot pressed (HP) and hot-isostatic pressed (HIP). The microstructure, mechanical properties, and tribological were evaluated to compare the processes. X-ray diffraction patterns showed that HIP-consolidated specimens had larger crystallite sizes and 37% less microstrain when compared to the HP specimens. The nanohardness of the HIP specimens was also carried out and it was 50% lower than that of HP specimens, whereas its coefficient of friction found was 25% higher. These results show the advantages of the HP process over the HIP since the high pressure. The low sintering temperature of HP inhibited the grain growth, which leads excellent mechanical and tribological properties of Ni.

Original languageEnglish
Article number127944
JournalMaterials Letters
Volume273
DOIs
StatePublished - 15 Aug 2020
Externally publishedYes

Keywords

  • COF
  • Nanoindentation
  • Nickel
  • Wear

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