Pressure-induced crystallization in a bulk amorphous Zr-based alloy

He, Duanwei; Zhao, Qiaoling; Wang, W.H; Che, Ruxin; Liu, Jing; Luo, Xiangang; Wang, W.K

doi:10.1016/s0022-3093(01)00906-1

Cited by 21 publications

(19 citation statements)

References 28 publications

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“…Crystallization of the amorphous starting materials is thermodynamically favored under high pressureespecially the formation of crystalline nuclei-because amorphous phases have a lower density and a higher compressibility than their corresponding crystalline states. 32 Conversely, the growth of a crystalline nucleus is usually accompanied by long-range atomic rearrangements and is kinetically hindered by external pressure. As pressure and temperature reach a critical point, the crystallization process is initiated simultaneously throughout the sample due to the extreme homogeneity of our amorphous starting materials after the long ball-milling process.…”

Section: Resultsmentioning

confidence: 99%

Superhard B–C–N materials synthesized in nanostructured bulks

Zhao¹,

He²,

Daemen³

et al. 2002

J. Mater. Res.

226

153

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We report here the high-pressure synthesis of well-sintered millimeter-sized bulks of superhard BC 2 N and BC 4 N materials in the form of a nanocrystalline composite with diamond-like amorphous carbon grain boundaries. The nanostructured superhard B-C-N material bulks were synthesized under high P-T conditions from amorphous phases of the ball-milled molar mixtures. The synthetic B-C-N samples were characterized by synchrotron x-ray diffraction, high-resolution transmission electron microscope, electron energy-loss spectra, and indentation hardness measurements. These new high-pressure phases of B-C-N compound have extreme hardnesses, second only to diamond. Comparative studies of the high P-T synthetic products of BC 2 N, BC 4 N, and segregated phases of diamond + cBN composite confirm the existence of the single B-C-N ternary phases.

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Section: Resultsmentioning

confidence: 99%

Superhard B–C–N materials synthesized in nanostructured bulks

Zhao¹,

He²,

Daemen³

et al. 2002

J. Mater. Res.

226

153

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show abstract

“…Soon it became one of the most familiar metallic alloys, and got relevant industrial application for its large dimension. Recently, more attention has been paid on the structural transformation of glassy alloys induced by external conditions, such as high-pressure annealing [2,3], electropulsing [4][5][6][7][8], etc. Electropulsing, or highdensity pulsing current (HDPC), was directly adopted to improve the mechanical properties [9], and induce the crystallization of Fe-Si-B amorphous ribbons [4] in early studies.…”

Section: Introductionmentioning

confidence: 99%

Crystallization kinetics of Zr41Ti14Cu12.5Ni10Be22.5 bulk metallic glass in pulsing current pretreatment states

Qiu

Yao

2009

Journal of Alloys and Compounds

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“…It has been shown that multi-component bulk amorphous alloys such as Zr-based metallic glasses have higher density randomly packed atomic configurations, which are closer to their crystalline states. Consequently, the crystalline solid solution phases can be formed without long-range atomic rearrangements in the amorphous matrix under high pressure even at room temperature [20]. Conversely, this pressure-induced crystallization process for ordinary amorphous alloys (i.e., simple binary alloys) is masked by the increase of crystallization temperature owing to steric hindrances for atomic rearrangements.…”

Section: Discussion and Concluding Remarksmentioning

confidence: 99%