High-pressure torsion of hafnium

Kaveh Edalati, Zenji Horita, Yoji Mine

研究成果: ジャーナルへの寄稿学術誌査読

50 被引用数 (Scopus)

抄録

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.

本文言語英語
ページ(範囲)2136-2141
ページ数6
ジャーナルMaterials Science and Engineering A
527
7-8
DOI
出版ステータス出版済み - 3月 25 2010

!!!All Science Journal Classification (ASJC) codes

  • 材料科学(全般)
  • 凝縮系物理学
  • 材料力学
  • 機械工学

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