High-pressure torsion of palladium: Hydrogen-induced softening and plasticity in ultrafine grains and hydrogen-induced hardening and embrittlement in coarse grains

Toshifumi Hongo; Kaveh Edalati; Hideaki Iwaoka; Makoto Arita; Junko Matsuda; Etsuo Akiba; Zenji Horita

doi:10.1016/j.msea.2014.08.074

High-pressure torsion of palladium: Hydrogen-induced softening and plasticity in ultrafine grains and hydrogen-induced hardening and embrittlement in coarse grains

Toshifumi Hongo, Kaveh Edalati, Hideaki Iwaoka, Makoto Arita, Junko Matsuda, Etsuo Akiba, Zenji Horita

Research output: Contribution to journal › Article › peer-review

17 Citations (Scopus)

Abstract

Pure Pd (99.9%) was processed by high-pressure torsion (HPT) to form an ultrafine-grained (UFG) structure with an average grain size of ~220. nm, high hardness of 175. Hv, high tensile strength of 650. MPa and appreciable plasticity of 20%. Tensile tests showed that, unlike coarse-grained sample in which a hydrogen-induced embrittlement and hardening occurred, a hydrogen-induced softening and plasticity occurred in the HPT-processed UFG sample. A hydride phase formed after exposing the samples to hydrogen, while the formation of hydride was facilitated by the HPT processing. The hydride phase was decomposed by holding the samples in the air for prolonged time, but the hydride phase was more stable after HPT processing.

Original language	English
Pages (from-to)	1-8
Number of pages	8
Journal	Materials Science and Engineering A
Volume	618
DOIs	https://doi.org/10.1016/j.msea.2014.08.074
Publication status	Published - Dec 1 2014

All Science Journal Classification (ASJC) codes

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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High-pressure torsion of palladium : Hydrogen-induced softening and plasticity in ultrafine grains and hydrogen-induced hardening and embrittlement in coarse grains. / Hongo, Toshifumi; Edalati, Kaveh; Iwaoka, Hideaki; Arita, Makoto ; Matsuda, Junko; Akiba, Etsuo; Horita, Zenji.

In: Materials Science and Engineering A, Vol. 618, 01.12.2014, p. 1-8.

Research output: Contribution to journal › Article › peer-review

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AU - Matsuda, Junko

AU - Akiba, Etsuo

AU - Horita, Zenji

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