3D nano-architected metallic glass: Size effect suppresses catastrophic failure

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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Size Effect on the Micro-Extrusion Forming of Zr-Based Amorphous Alloys

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.228-229.586 ◽

2011 ◽

Vol 228-229 ◽

pp. 586-591 ◽

Cited By ~ 1

Author(s):

Xiao Wu ◽

Chun E Xue

Keyword(s):

Metallic Glass ◽

Size Effect ◽

Bulk Metallic Glass ◽

Apparent Viscosity ◽

Liquid State ◽

Amorphous Alloys ◽

Micro Parts ◽

Inner Diameter ◽

Extrusion Forming ◽

Significant Size

Micro-extrusion of a Zr-based bulk metallic glass in its super-cooled liquid state is explored as a method to create objects of cup-shaped micro-parts. The effects of overall dimensions of the samples and the ratio of inner diameter to out diameter (i) on the forming are determined. The results reveal that the apparent viscosity of the forming liquid increases along with the rises of i or with the decrease of the overall dimensions, and the increasing speed is more quickly while i is greater than 0.833, which suggest that there exists significant size effect. More generally, the results suggest that large i, and a low overall dimensions are attributes indicating difficulty for forming.

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The sample size effect in metallic glass deformation

Scientific Reports ◽

10.1038/s41598-020-67813-w ◽

2020 ◽

Vol 10 (1) ◽

Author(s):

Yannick Champion ◽

Nicolas Thurieau

Keyword(s):

Metallic Glass ◽

Size Effect ◽

Sample Size ◽

Sample Size Effect

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Nanoindentation study of size effect and loading rate effect on mechanical properties of a thin film metallic glass Cu49.3Zr50.7

Physica B Condensed Matter ◽

10.1016/j.physb.2011.10.050 ◽

2012 ◽

Vol 407 (3) ◽

pp. 340-346 ◽

Cited By ~ 25

Author(s):

Jian-Jun Pang ◽

Ming-Jen Tan ◽

K.M. Liew ◽

Christopher Shearwood

Keyword(s):

Thin Film ◽

Mechanical Properties ◽

Metallic Glass ◽

Size Effect ◽

Loading Rate ◽

Rate Effect

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Size effect on beta relaxation in a La-based bulk metallic glass

Physica B Condensed Matter ◽

10.1016/j.physb.2016.12.035 ◽

2017 ◽

Vol 509 ◽

pp. 46-49 ◽

Cited By ~ 1

Author(s):

Wei Jiang ◽

Jili Wu ◽

Bo Zhang

Keyword(s):

Metallic Glass ◽

Size Effect ◽

Bulk Metallic Glass

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Revealing Nanoindentation Size-Dependent Creep Behavior in a La-Based Metallic Glassy Film

Nanomaterials ◽

10.3390/nano9121712 ◽

2019 ◽

Vol 9 (12) ◽

pp. 1712

Author(s):

Yi Ma ◽

Yuxuan Song ◽

Taihua Zhang

Keyword(s):

Metallic Glass ◽

Size Effect ◽

Creep Strain ◽

Creep Behavior ◽

Creep Deformation ◽

Creep Resistance ◽

Depth Effect ◽

Size Dependent ◽

The Relationship ◽

Strain Dependent

We systematically studied nanoindentation size effect on creep deformation in a La-based metallic glassy film, including holding depth effect and indenter size effect. Creep displacement was mainly dependent on both holding strain and deformation volume beneath indenter. Under elastic holding, creep strain was merely holding strain–dependent. While for plastic holding, creep strain was greatly enhanced by adopting smaller indenter and/or decreasing holding depth at the same holding strain. A strong nanoindentation size effect on creep resistance was validated. Strain rate sensitivities (SRS) were calculated, which were obviously higher at elastic regions than at plastic holdings. The relationship between SRS value and creep mechanism in metallic glass was discussed.

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