Cover Picture: Fracture surface of a bulk metallic glasses after compression test. Picture: courtesy of Tanya Baser – Università di Torino. (Adv. Eng. Mater. 6/2007)

2007 ◽  
Vol 9 (6) ◽  
pp. NA-NA
Keyword(s):  
Fracture Surface ◽  
Compression Test ◽  
Metallic Glasses ◽  
Bulk Metallic Glasses ◽  
Test Picture

scholarly journals Correlation between fracture surface morphology and toughness in Zr-based bulk metallic glasses

2010 ◽  
Vol 25 (5) ◽  
pp. 982-990 ◽  
Author(s):  
Jin-Yoo Suh ◽  
R. Dale Conner ◽  
C. Paul Kim ◽  
Marios D. Demetriou ◽  
William L. Johnson
Keyword(s):  
Electron Microscopy ◽  
Fracture Toughness ◽  
Scanning Electron Microscopy ◽  
Energy Dissipation ◽  
Fracture Surface ◽  
Metallic Glasses ◽  
Shear Bands ◽  
Bulk Metallic Glasses ◽  
Fracture Surface Morphology ◽  
Scanning Electron

Fracture surfaces of Zr-based bulk metallic glasses of various compositions tested in the as-cast and annealed conditions were analyzed using scanning electron microscopy. The tougher samples have shown highly jagged patterns at the beginning stage of crack propagation, and the length and roughness of this jagged pattern correlate well with the measured fracture toughness values. These jagged patterns, the main source of energy dissipation in the sample, are attributed to the formation of shear bands inside the sample. This observation provides strong evidence of significant “plastic zone” screening at the crack tip.

Room Temperature Plasticity of Zr65Al7.5Ni10Cu17.5-xPdx Bulk Metallic Glasses

2007 ◽  
Vol 539-543 ◽  
pp. 2054-2058 ◽  
Author(s):  
Kyosuke Yoshimi ◽  
Hidemi Kato ◽  
Junji Saida ◽  
Akihisa Inoue
Keyword(s):  
Structural Change ◽  
Fracture Surface ◽  
Viscous Flow ◽  
Metallic Glasses ◽  
Room Temperature ◽  
Bulk Metallic Glasses ◽  
Plastic Behavior ◽  
Large Plastic Strain ◽  
X Ray ◽  
Flow Deformation

Monolithic Zr65Al7.5Ni10Pd17.5 and Zr65Al7.5Ni10Cu17.5 hardly had plastic deformability in tension at room temperature, although Zr65Al7.5Ni10Pd17.5 showed a large plastic strain in compression. A depressed zone that is the evidence of viscous flow deformation (so-called viscous flow depression zone; VFD-zone) was observed for Zr65Al7.5Ni10Pd17.5 around the edge at the point of failure on its specimen surfaces. However, no VFD-zone was seen for Zr65Al7.5Ni10Cu17.5. Thus, a clear difference in tensile plastic behavior was found between Zr65Al7.5Ni10Pd17.5 and Zr65Al7.5Ni10Cu17.5. A structural change in the vicinity of the fracture surface of Zr65Al7.5Ni10Pd17.5 was measured by micro-beam X-ray diffractometry (MB-XRD). We may be able to discuss the room temperature plasticity of Zr65Al7.5Ni10Cu17.5-xPdx bulk metallic glasses correlating with the phase stability of the amorphous and icosahedral quasi-crystalline phases.

High-strength Cu–Ti-rich bulk metallic glasses and nano-composites

2003 ◽  
Vol 94 (5) ◽  
pp. 615-620 ◽  
Author(s):  
Mariana Calin ◽  
Jürgen Eckert ◽  
Ludwig Schultz
Keyword(s):  
Metallic Glasses ◽  
Bulk Metallic Glasses ◽  
High Strength ◽  
Nano Composites
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