High-pressure torsion of hafnium

Kaveh Edalati, Zenji Horita, Yoji Mine

Research output: Contribution to journalArticlepeer-review

57 Citations (Scopus)


Pure Hf (99.99%) is processed by high-pressure torsion (HPT) under pressures of 4 and 30 GPa to form an ultrafine-grained structure with a gain size of ∼180 nm. X-ray diffraction analysis shows that, unlike Ti and Zr, no ω phase formation is detected after HPT processing even under a pressure of 30 GPa. A hydride formation is detected after straining at the pressure of 4 GPa. The hydride phase decomposes either by application of a higher pressure as 30 GPa or by unloading for prolong time after HPT processing. Microhardness, tensile and bending tests show that a high hardness (360 Hv) and an appreciable ductility (8%) as well as high tensile and bending strength (1.15 and 2.75 GPa, respectively) are achieved following the high-pressure torsion.

Original languageEnglish
Pages (from-to)2136-2141
Number of pages6
JournalMaterials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
Issue number7-8
Publication statusPublished - Mar 25 2010

All Science Journal Classification (ASJC) codes

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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