Electron microscopy of bulk metallic glass machining chips

Mustafa Bakkal

doi:10.1016/j.jnoncrysol.2009.07.018

Electron microscopy of bulk metallic glass machining chips

Mustafa Bakkal^*

^*Corresponding author for this work

Department of Mechanical Engineering

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

Abstract

Machined Zr_52.5Ti₅Cu_17.9Ni_14.6Al₁₀ bulk metallic glass (BMG) chips were characterized using high resolution electron microscopy. Compared to conventional processing techniques, machining produces very high heating/cooling, and deformation rates. It is therefore of interest to compare structural changes in machining chips with those produced by conventional processing. Large (∼1 μm) crystalline grain, residual amorphous region, and phase separation in the amorphous-crystalline transition region were detected in bright field TEM images. Three equilibrium phases, Zr₂Cu, ZrAl₂, and Zr₂Ni, which have been identified in samples undergoing conventional annealing, were revealed from selected area electron diffraction patterns of the chips. High magnification TEM micrographs showed nanocrystallites, about 10 nm in size, in the amorphous-crystalline transition region.

Original language	English
Pages (from-to)	2220-2223
Number of pages	4
Journal	Journal of Non-Crystalline Solids
Volume	355
Issue number	45-47
DOIs	https://doi.org/10.1016/j.jnoncrysol.2009.07.018
Publication status	Published - 1 Nov 2009

Funding

The author thanks to Dr. Albert J. Shih, Dr. Ronald O. Scattergood and Dr. Lawrance F. Allard for the useful comments on the manuscript. A portion of this research was sponsored by the Heavy Vehicle Propulsion Systems Materials Program, Office of Transportation Technologies, US Department of Energy and by the Assistant Secretary for Energy Efficiency and Renewable Energy, Office of Transportation Technologies, as part of the High Temperature Materials Laboratory User Program, Oak Ridge National Laboratory, managed by UT-Battelle, LLC for the US Department of Energy under Contract No. DE-AC05-00OR22725.

Funders	Funder number
Office of Transportation Technologies
US Department of Energy
UT-Battelle
Office of Energy Efficiency and Renewable Energy
Oak Ridge National Laboratory

Keywords

Amorphous metals, metallic glasses
Crystallization
Liquid alloys and liquid metals
Microcrystallinity
Nanocrystals
TEM/STEM

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10.1016/j.jnoncrysol.2009.07.018

Cite this

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title = "Electron microscopy of bulk metallic glass machining chips",

abstract = "Machined Zr52.5Ti5Cu17.9Ni14.6Al10 bulk metallic glass (BMG) chips were characterized using high resolution electron microscopy. Compared to conventional processing techniques, machining produces very high heating/cooling, and deformation rates. It is therefore of interest to compare structural changes in machining chips with those produced by conventional processing. Large (∼1 μm) crystalline grain, residual amorphous region, and phase separation in the amorphous-crystalline transition region were detected in bright field TEM images. Three equilibrium phases, Zr2Cu, ZrAl2, and Zr2Ni, which have been identified in samples undergoing conventional annealing, were revealed from selected area electron diffraction patterns of the chips. High magnification TEM micrographs showed nanocrystallites, about 10 nm in size, in the amorphous-crystalline transition region.",

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AB - Machined Zr52.5Ti5Cu17.9Ni14.6Al10 bulk metallic glass (BMG) chips were characterized using high resolution electron microscopy. Compared to conventional processing techniques, machining produces very high heating/cooling, and deformation rates. It is therefore of interest to compare structural changes in machining chips with those produced by conventional processing. Large (∼1 μm) crystalline grain, residual amorphous region, and phase separation in the amorphous-crystalline transition region were detected in bright field TEM images. Three equilibrium phases, Zr2Cu, ZrAl2, and Zr2Ni, which have been identified in samples undergoing conventional annealing, were revealed from selected area electron diffraction patterns of the chips. High magnification TEM micrographs showed nanocrystallites, about 10 nm in size, in the amorphous-crystalline transition region.

KW - Amorphous metals, metallic glasses

KW - Crystallization

KW - Liquid alloys and liquid metals

KW - Microcrystallinity

KW - Nanocrystals

KW - TEM/STEM

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Electron microscopy of bulk metallic glass machining chips

Abstract

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Keywords

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