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Compression testing shows that at low-oxygen levels (240ppm) the Cu 49 Hf 42 Al 9 glass deforms predominantly by shear and is quite tough. Specimens with higher oxygen levels (1700ppm) have oxygen-containing dendrites in an amorphous matrix and show no plasticity. Importantly, the dominant fracture mode is not shear but local tensile failure. Although there is a slight reduction...
The fragility parameter m of (Pt or Pd)–(Ni,Cu)–P bulk metallic glasses (BMGs) was characterized and compared to other systems. The results indicate that the Pt 65 Ni 15 P 25 alloy is the most fragile and thermally stable at the supercooled liquid state, thus is the most workable among the presently developed BMGs. To express the degree of workability, a deformability d∗=log[η(Tg∗)/η(Tx)]...
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