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Suzuki, Hiroshi; Yamada, Rui*; Tsubaki, Shinki*; Imafuku, Muneyuki*; Sato, Shigeo*; Watanuki, Tetsu; Machida, Akihiko; Saida, Junji*
Metals, 6(1), p.12_1 - 12_11, 2016/01
Times Cited Count：3 Percentile：17.57(Materials Science, Multidisciplinary)Elastic deformation behaviors of as-cast and annealed eutectic and hypoeutectic Zr-Cu-Al bulk metallic glasses (BMGs) were investigated on a basis of different strain-scales determined by X-ray scattering and the strain gauge. The microscopic strains determined by Direct-space method (DSM) and Q-space method (QSM) were compared with the macroscopic strain measured by the strain gauge, and the difference in the deformation mechanism between eutectic and hypoeutectic Zr-Cu-Al BMGs was investigated by their correlation. The eutectic Zr
Cu
Al
BMG obtains more homogeneous microstructure by free-volume annihilation after annealing, improving a resistance to deformation but degrading ductility because of a decrease in the volume fraction of WBRs (Weakly-Bonded Regions) with relatively high mobility. On the other hand, the as-cast hypoeutectic Zr
Cu
Al BMG originally has homogeneous microstructure, but loses its structural and elastic homogeneities because of nanocluster formation after annealing. Such structural changes after annealing might develop unique mechanical properties showing no degradations of ductility and toughness for the structural-relaxed hypoeutectic BMGs.
AlNi
Cu bulk metallic glass containing ZrC particles by synchrotron X-ray diffractionSuzuki, Hiroshi; Saida, Junji*; Shobu, Takahisa; Katsuyama, Jinya; Kato, Hidemi*; Imafuku, Muneyuki*; Sato, Shigeo*
Scripta Materialia, 66(10), p.801 - 804, 2012/05
Times Cited Count：6 Percentile：37.98(Nanoscience & Nanotechnology)Compressive deformation mechanism of a ZrAlNiCu bulk metallic glass containing 10vol.%ZrC (ZrC-BMG) was evaluated by measuring the residual strains in the compressive deformed samples using the synchrotron X-ray diffraction and also evaluating the localized deformation behavior around the ZrC particles by the finite element analysis. Phase stress shared by the metallic glass matrix was increased before macroscopic yielding due to local plastic deformation around the ZrC particles. After macroscopic yielding, the phase stress shared by the ZrC phase was drastically increased, and finally the ZrC-BMG was fractured by breaking the ZrC particles reaching its fracture strength.
Suzuki, Hiroshi; Saida, Junji*; Imafuku, Muneyuki*; Sato, Shigeo*
no journal, ,
Residual stress measurements using neutron and X-ray diffractions are applicable to crystalline materials whereas the strain measurement in amorphous materials had been difficult. Recently, Q-space method, which can evaluate the strain from peak shift of 1st halo peak measured by synchrotron X-ray, and Direct space method, which can evaluate the strain from changes in local structures obtained by the radial distribution function, have been reported by Poulsed et al. In this study, the evaluation of tensile deformation in ZrAlNiCu metallic glass using Q-space method was discussed by using neutron diffraction.
Suzuki, Hiroshi; Saida, Junji*; Imafuku, Muneyuki*
no journal, ,
Residual stress and deformation behavior on a ZrAlNiCu bulk metallic glass containing 10vol%ZrC particles were measured using neutron diffraction. Elastic deformation behavior under uniaxial tensile loading can be predicted by the Self-Consistent model. Since phase stress transferred to the metallic glass matrix is 5% less than applied stresses and the residual stress in the matrix is approximately 100MPa in tension, the compressive strength of the composite bulk metallic glass would be higher than that of monolithic one.
Suzuki, Hiroshi; Imafuku, Muneyuki*; Saida, Junji*; Setyawan, A. D.*; Kato, Hidemi*
no journal, ,
Deformation behavior on a ZrAlNiCu bulk metallic glass containing 10 vol%ZrC particles were measured using neutron diffraction. Elastic deformation behavior under uniaxial tensile loading can be predicted by the Self-Consistent model. Higher strength in compressive deformation in this sample is originated from the thermal tensile residual stresses, and from the phase stresses transferred to the metallic glass matrix which are 5% less than the applied stresses under uniaxial loading.
Suzuki, Hiroshi; Saida, Junji*; Katsuyama, Jinya; Imafuku, Muneyuki*; Setyawan, A. D.*; Kato, Hidemi*; Sato, Shigeo*
no journal, ,
no abstracts in English
Suzuki, Hiroshi; Saida, Junji*; Kato, Hidemi*; Sato, Shigeo*; Imafuku, Muneyuki*; Shobu, Takahisa
no journal, ,
no abstracts in English
