Deformation-Induced Nanocrystal Precipitation in Al-Base Metallic Glasses

Gao, Michael C.; Hackenberg, Robert E.; Shiflet, G. J.

doi:10.2320/matertrans.42.1741

Cited by 51 publications

(34 citation statements)

References 18 publications

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“…For example, the precipitation of the nanoscale α-Al particles at room temperature was observed in marginal Al-TM-RE glass-formers (like Al 90 Fe 5 Gd 5 or Al 90 Fe 5 Ce 5 ) within the shear bands on deformation [92,93], while a very limited fraction or complete absence of nanocrystals (depending on RE metal) was observed after significant plastic deformation in the Al 85 RE 8 Ni 5 Co 2 amorphous and glassy samples [94] (~30% reduction in thickness) which undergo a clear nucleation and growth behavior.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties and Deformation Behavior of Bulk Metallic Glasses

Louzguine-Luzgin

Louzguina-Luzgina

Churyumov

2012

Metals

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Metallic glasses demonstrate unique properties, including large elastic limit and high strength, which make them attractive for practical applications. Unlike crystalline alloys, metallic glasses, in general, do not exhibit a strain hardening effect, while plastic deformation at room temperature is localized in narrow shear bands. Room-temperature mechanical properties and deformation behavior of bulk metallic glassy samples and the crystal-glassy composites are reviewed in the present paper.

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Section: Introductionmentioning

confidence: 99%

Mechanical Properties and Deformation Behavior of Bulk Metallic Glasses

Louzguine-Luzgin

Louzguina-Luzgina

Churyumov

2012

Metals

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“…However, since the first observation of the formation of Al nano-crystallites at shear bands of Al-based amorphous alloy ribbons bent at room temperature [9], it has been widely observed that nanocrystallization in an amorphous matrix can be induced by a variety of mechanical approaches, such as bending [9][10][11][12], nano-indentation [13,14], ball milling [15], tension [2,10], and even by hydrostatic pressure [16,17]. The temperature rise during mechanical processes was first noted as the reason for the crystallization in amorphous matrix [10,18]. However, recent studies [11,13,14] have indicated that nanocrystallites can also be formed near or even below room temperature.…”

Section: Introductionmentioning

confidence: 99%

Behavior of amorphous materials under hydrostatic pressures: A molecular dynamics simulation study

Lee

Kim

et al. 2004

Met. Mater. Int.

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The atomic structural behavior of amorphous pure Ni under hydrostatic pressures has been investigated through a molecular dynamics simulation study based on a semi-empirical interatomic potential (MEAM). It was observed that the amorphous material crystallizes under hydrostatic compressive pressure but forms nanovoids under hydrostatic tensile pressure at room temperature. These results could be explained by the volume change effect on the nucleation energy barrier during crystallization. Consistent with this explanation, stress induced increase in the energy level (decrease of energy barrier) is proposed as the main reason for the mechanically driven nanocrystallization of amorphous materials.

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“…Recently, mechanically induced nanocrystallization in amorphous alloys, achieved by ball milling, [1][2][3] bending, 4,5 rolling, 6 tension, 7,8 and nanoindentation, 9,10 has received much attention. The process of mechanically induced nanocrystallization is of potential practical significance for the synthesis of amorphous-nanocrystallite composites and their processing and service.…”

Section: Introductionmentioning

confidence: 99%

“…12 Mechanically induced nanocrystallization appears to be a general phenomenon, since it has been observed in Al-, Zr-, and Fe-based alloys. [1][2][3][4][5][6][7][8][9][10][11][12] However, this process is composition dependent; it may vary between otherwise similar alloys. 1,4 Mechanically induced nanocrystallization occurs exclusively at shear bands, which are the main microstructural response to plastic deformation in amorphous alloys.…”

Section: Introductionmentioning

confidence: 99%

Deformation-induced nanocrystallization: A comparison of two amorphous Al-based alloys

2005

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Using conventional and high-resolution transmission electron microscopy (HRTEM), the effects of rolling at room temperature on the microstructures of amorphous Al 90 Fe 5 Gd 5 and Al 86.8 Ni 3.7 Y 9.5 were compared. In rolled Al 90 Fe 5 Gd 5 , nanocrystallites were observed at shear bands, whereas none were observed in rolled Al 86.8 Ni 3.7 Y 9.5 . When HRTEM was combined with with Fourier transform filtering, nanoscale, low-density defects were imaged. In Al 90 Fe 5 Gd 5 , the shear bands contain few defects, which are concentrated at the boundary zone between the shear bands and undeformed region, whereas in Al 86.8 Ni 3.7 Y 9.5 , the shear bands contain a uniform distribution of defects with a density higher than the undeformed region. The preferential precipitation of nanocrystallites in rolled Al 90 Fe 5 Gd 5 is attributed to a kinetic effect due to uniformly-distributed excess free volume in the shear bands.

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Deformation-Induced Nanocrystal Precipitation in Al-Base Metallic Glasses

Cited by 51 publications

References 18 publications

Mechanical Properties and Deformation Behavior of Bulk Metallic Glasses

Mechanical Properties and Deformation Behavior of Bulk Metallic Glasses

Behavior of amorphous materials under hydrostatic pressures: A molecular dynamics simulation study

Deformation-induced nanocrystallization: A comparison of two amorphous Al-based alloys

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