Microstructure evolution of bulk metallic glass during thermal oxidation under plastic strain

AbstractWe report a strong geometry-dependence of compressive plasticity in a Zr-based bulk metallic glass (BMG). With a standard orthogonal geometry, the Zr-based BMG typically fractured at a plastic strain less than 2%. However, by modifying the sample geometry while maintaining the sample aspect ratio, a large apparent compressive plastic strain over 10% was achieved consistently. These results present a new method on arresting the catastrophic failure of the glassy alloys and offer ways for BMGs in engineering applications.

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Effect of Single Pass Laser Surface Treatment on Microstructure Evolution of Inoculated Zr47.5Cu45.5Al5Co2 and Non-Inoculated Zr65Cu15Al10Ni10 Bulk Metallic Glass Matrix Composites

Engineering ◽

10.4236/eng.2018.1010052 ◽

2018 ◽

Vol 10 (10) ◽

pp. 730-758

Author(s):

Muhammad Musaddique Ali Rafique

Keyword(s):

Metallic Glass ◽

Surface Treatment ◽

Bulk Metallic Glass ◽

Microstructure Evolution ◽

Glass Matrix ◽

Laser Surface ◽

Matrix Composites ◽

Laser Surface Treatment ◽

Single Pass ◽

Glass Matrix Composites

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Microstructure evolution and mechanical properties of Cu46Zr47Al7 bulk metallic glass composite containing CuZr crystallizing phases

Materials Science and Engineering A ◽

10.1016/j.msea.2007.02.093 ◽

2007 ◽

Vol 467 (1-2) ◽

pp. 139-145 ◽

Cited By ~ 48

Author(s):

F. Jiang ◽

D.H. Zhang ◽

L.C. Zhang ◽

Z.B. Zhang ◽

L. He ◽

...

Keyword(s):

Mechanical Properties ◽

Metallic Glass ◽

Bulk Metallic Glass ◽

Microstructure Evolution ◽

Glass Composite ◽

Bulk Metallic Glass Composite

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Microstructure evolution in Nd:YAG laser-welded (Zr53Cu30Ni9Al8)Si0.5 bulk metallic glass alloy

Journal of Alloys and Compounds ◽

10.1016/j.jallcom.2010.01.132 ◽

2010 ◽

Vol 495 (1) ◽

pp. 224-228 ◽

Cited By ~ 37

Author(s):

Huei-Sen Wang ◽

Hou-Guang Chen ◽

Jason Shian-Ching Jang

Keyword(s):

Metallic Glass ◽

Bulk Metallic Glass ◽

Microstructure Evolution ◽

Nd:Yag Laser ◽

Glass Alloy

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Free Volume Evolution in Bulk Metallic Glass during High Temperature Creep

MRS Proceedings ◽

10.1557/proc-754-cc11.16 ◽

2002 ◽

Vol 754 ◽

Author(s):

B. S. Sundar Daniel ◽

Martin Heilmaier ◽

Birgit Bartusch ◽

Jörn Kanzow ◽

Katja Günther-Schade ◽

...

Keyword(s):

Glass Transition ◽

Plastic Strain ◽

Metallic Glass ◽

Bulk Metallic Glass ◽

Free Volume ◽

Metallic Glasses ◽

Constant Strain Rate ◽

Dsc Analysis ◽

Scanning Calorimetry ◽

Positron Lifetime Spectroscopy

ABSTRACTMetallic glasses lack long-range translational symmetry and have excess volume trapped within their amorphous structure, which has a direct bearing on their physical properties including deformation characteristics. Moreover, the trapped excess free volume is directly correlated to the defect concentration facilitating the possibility to model the temperature and time dependence of the free volume changes during creep as a trade off between defect generation and annihilation. Using differential scanning calorimetry (DSC) analysis the residual free volume of a metallic glass can be characterised based on the glass transition peak height (Δcp). In the present work constant strain rate tests were carried out at the ‘onset’ (Tgon = 685 K) and ‘point of inflection’ (Tgp = 705 K) of the calorimetric glass transition to study the time dependent flow behaviour in Zr55Cu30Al10Ni5 bulk metallic glass. Modelling based on DSC analysis and positron lifetime spectroscopy on samples creep deformed to different plastic strain values corroborate the stress decrease after the peak stress (‘stress overshoot’) occurring in bulk metallic glasses with increasing plastic strain to be associated with a small increase in free volume.

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