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Yakai Zhao

Hanyang University

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Featured researches published by Yakai Zhao.

Philosophical Magazine | 2016

Hydrogen-induced softening in nanocrystalline Ni investigated by nanoindentation

Yakai Zhao; Moo-Young Seok; Dong-Hyun Lee; Jung-A Lee; Jin-Yoo Suh; Jae-il Jang

Abstract The influence of hydrogen on the plastic deformation of nanocrystalline nickel was analysed by recourse to nanoindentation on the uncharged and hydrogen-charged samples. It was revealed that, in nanocrystalline Ni, hydrogen significantly decreases hardness but does not alter the strain rate sensitivity. Through thermal desorption spectroscopy measurement, charged hydrogen was expected to reside in face-centred cubic lattice, grain boundaries (GBs) and vacancies rather than dislocations. The hydrogen-induced softening behaviour is discussed in terms of the possible roles of hydrogen in GB-assisted dislocation flow mechanism.

Acta Materialia | 2012

Indentation size effect and shear transformation zone size in a bulk metallic glass in two different structural states

In-Chul Choi; Yakai Zhao; Yong-Jae Kim; Byung-Gil Yoo; Jin-Yoo Suh; U. Ramamurty; Jae-il Jang

Acta Materialia | 2016

Spherical nanoindentation creep behavior of nanocrystalline and coarse-grained CoCrFeMnNi high-entropy alloys

Dong-Hyun Lee; Moo-Young Seok; Yakai Zhao; In-Chul Choi; J.Y. He; Zhaoping Lu; Jin-Yoo Suh; U. Ramamurty; Megumi Kawasaki; Terence G. Langdon; Jae-il Jang

Scripta Materialia | 2012

Estimation of the shear transformation zone size in a bulk metallic glass through statistical analysis of the first pop-in stresses during spherical nanoindentation

In-Chul Choi; Yakai Zhao; Byung-Gil Yoo; Yong-Jae Kim; Jin-Yoo Suh; U. Ramamurty; Jae-il Jang

Scripta Materialia | 2017

Resistance of CoCrFeMnNi high-entropy alloy to gaseous hydrogen embrittlement

Yakai Zhao; Dong-Hyun Lee; Moo-Young Seok; Jung-A Lee; M.P. Phaniraj; Jin-Yoo Suh; Heon-Young Ha; Ju-Young Kim; U. Ramamurty; Jae-il Jang

International Journal of Plasticity | 2014

Predicting flow curves of two-phase steels from spherical nanoindentation data of constituent phases: Isostrain method vs. non-isostrain method

Moo-Young Seok; Yong-Jae Kim; In-Chul Choi; Yakai Zhao; Jae-il Jang

Acta Materialia | 2014

Effect of hydrogen on the yielding behavior and shear transformation zone volume in metallic glass ribbons

Yakai Zhao; In-Chul Choi; Moo-Young Seok; Min-Hyun Kim; Do-Hyang Kim; U. Ramamurty; Jin-Yoo Suh; Jae-il Jang

Journal of Alloys and Compounds | 2014

On the nanomechanical characteristics of thermally-treated alloy 690: Grain boundaries versus grain interior

Yakai Zhao; In-Chul Choi; Yong-Jae Kim; Jae-il Jang

Scripta Materialia | 2015

The role of hydrogen in hardening/softening steel: Influence of the charging process

Yakai Zhao; Moo-Young Seok; In-Chul Choi; Yun-Hee Lee; Seongjun Park; U. Ramamurty; Jin-Yoo Suh; Jae-il Jang

Scripta Materialia | 2014

Hydrogen-induced hardening and softening of Ni-Nb-Zr amorphous alloys: Dependence on the Zr content

Yakai Zhao; In-Chul Choi; Moo-Young Seok; U. Ramamurty; Jin-Yoo Suh; Jae-il Jang

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Jae-il Jang

Hanyang University

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Moo-Young Seok

Hanyang University

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U. Ramamurty

Indian Institute of Science

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In-Chul Choi

Hanyang University

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Jin-Yoo Suh

Korea Institute of Science and Technology

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Dong-Hyun Lee

Hanyang University

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Jung-A Lee

Hanyang University

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Yong-Jae Kim

Hanyang University

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Ju-Young Kim

Ulsan National Institute of Science and Technology

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Woo-Jin Kim

Hanyang University

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