Formation of oriented nanocrystals in an amorphous alloy by focused-ion-beam irradiation

Tarumi, Ryuichi; Takashima, Kazuki; Higo, Yakichi

doi:10.1063/1.1526922

Cited by 44 publications

(35 citation statements)

References 12 publications

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“…For micro/nano features, FIB irradiation can induce a change in density and may introduce a nanocrystalline structure, depending on the irradiation conditions [44][45][46]. However, the dimensions of such a formed nanocrystalline structure would be around 10nm [45,46]; this would not improve the wear resistance of the BMG because the crystal size is too small to support normal loads [40]. In addition, the size effect may be taken into account when considering the fatigue behavior of micro/nano features.…”

Section: Wear Of Bulk Metallic Glass Materials During Molding Processmentioning

confidence: 99%

Replication of micro/nano-scale features by micro injection molding with a bulk metallic glass mold insert

Zhang

Chu

Byrne

et al. 2012

J. Micromech. Microeng.

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Abstract. The development of MEMS and Microsystems needs a reliable massproduction process to fabricate micro components with micro/nano scale features. In our study, we used the micro injection molding process to replicate micro/nano scale channels and ridges from a Bulk Metallic Glass (BMG) cavity insert. High density polyethylene (HDPE) was used as the molding material and Design of Experiment (DOE) was adopted to systematically and statistically investigate the relationship between machine parameters, real process conditions and replication quality. The peak cavity pressure and temperature were selected as process characteristic values to describe the real process conditions that material experienced during the filling process. The experiments revealed that the replication of ridges, including feature edge, profile and filling height, was sensitive to the flow direction; cavity pressure and temperature both increased with holding pressure and mold temperature; replication quality can be improved by increasing cavity pressure and temperature within a certain range. The replication quality of micro/nano features is tightly related to the thermomechanical history of material experienced during the molding process. In addition, the longevity and roughness of the BMG insert was also evaluated based on the number of injection molding cycles.

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Section: Wear Of Bulk Metallic Glass Materials During Molding Processmentioning

confidence: 99%

Replication of micro/nano-scale features by micro injection molding with a bulk metallic glass mold insert

Zhang

Chu

Byrne

et al. 2012

J. Micromech. Microeng.

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show abstract

“…19) We found that electron irradiation can induce nanocrystallization of an amorphous phase in metallic glasses in which nanostructure cannot be easily realized by thermal annealing. 14,20) The metastable nanocrystalline phase was formed from an amorphous phase by electron irradiation 21,22) and the formation of crystallographically orientated nanocrystals under FIB irradiation 16) was reported. These novel results imply that electron irradiation to an amorphous phase is a new method to obtain the controlled nanocrystalline structure in metallic glasses.…”

Section: Introductionmentioning

confidence: 99%

“…The crystallization of the amorphous phase is induced not only by thermal annealing but other external factors such as electron irradiation, 14,15) focused ion beam (FIB), 16) electropulsing 17,18) and high pressure. 19) We found that electron irradiation can induce nanocrystallization of an amorphous phase in metallic glasses in which nanostructure cannot be easily realized by thermal annealing.…”

Section: Introductionmentioning

confidence: 99%

Electron Irradiation Induced Crystallization of the Amorphous Phase in Zr-Cu Based Metallic Glasses with Various Thermal Stability

Nagase

Umakoshi

2004

Mater. Trans.

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The phase stability of the amorphous phase against electron irradiation and the crystallization behavior under electron irradiation were investigated in Zr-Cu based metallic glasses. The phase stability of the amorphous phase against thermal crystallization, i.e., thermal stability was evaluated by the temperature range of supercooled liquid region (ÁT x ). The ÁT x values for Zr 66:7 Cu 33:3 , Zr 65:0 Al 7:5 Cu 27:5 and Zr 65:0 Al 7:5 Ni 10:0 Cu 17:5 alloys were 54 K, 89 K and 119 K, respectively. The amorphous phase of Zr-Cu based metallic glasses was not stable under electron irradiation. The crystallization of fcc-Zr 2 Cu phase was accelerated by electron irradiation instead of bct-Zr 2 Cu phase which appeared during thermal annealing. The increase in the thermal stability of the amorphous phase is effective for the decrease in the crystallization rate under electron irradiation, but not always effective in suppressing the occurrence of electron irradiation induced crystallization.

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“…[5][6][7][8][9] The formation of crystallographically orientated nanocrystals under focused ion beam (FIB) irradiation was reported. 10) Metallic glasses are known to show glass-to-liquid (G-L) transition and a supercooled liquid region can be maintained above the glass transition temperature (T g ). Table 2 shows the results of electron-irradiation induced crystallization in Zr-based metallic glasses reported to date.…”

Section: Introductionmentioning

confidence: 99%

Electron-Irradiation Induced Phase Transformation of Amorphous, Supercooled Liquid and Crystalline Phases in Zr<SUB>66.7</SUB>Cu<SUB>33.3</SUB> Metallic Glass

Nagase

Umakoshi

2006

Mater. Trans.

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Electron-irradiation induced phase transformation of amorphous, supercooled liquid and crystalline phases in Zr 66:7 Cu 33:3 alloy was investigated. The amorphous phase and supercooled liquid were not stable under 2.0 MV electron-irradiation, and electron-irradiation induced crystallization occurred. The C11 b -Zr 2 Cu crystalline phase was precipitated from the supercooled liquid phase and the amorphous phase at and above 552 K, while an f.c.c. solid solution was precipitated from the amorphous phase at and below 298 K. Crystal-to-glass or crystal-tosupercooled liquid transition of the C11 b -Zr 2 Cu crystalline phase in Zr 66:7 Cu 33:3 metallic glass was not observed at and above 552 K. Phase stability of crystalline phases against electron-irradiation is a dominant factor for phase selection in electron-irradiation induced crystallization of Zr 66:7 Cu 33:3 metallic glass.

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Formation of oriented nanocrystals in an amorphous alloy by focused-ion-beam irradiation

Cited by 44 publications

References 12 publications

Replication of micro/nano-scale features by micro injection molding with a bulk metallic glass mold insert

Replication of micro/nano-scale features by micro injection molding with a bulk metallic glass mold insert

Electron Irradiation Induced Crystallization of the Amorphous Phase in Zr-Cu Based Metallic Glasses with Various Thermal Stability

Electron-Irradiation Induced Phase Transformation of Amorphous, Supercooled Liquid and Crystalline Phases in Zr<SUB>66.7</SUB>Cu<SUB>33.3</SUB> Metallic Glass

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