Bulk metallic glasses

BULK METALLIC GLASS FORMATION IN THE Pd-Ni-P and Pd-Cu-P ALLOY SYSTEMS... 

M. Stoica, J. Eckert, S. Roth, Z. F. Zhang, L. Schultz, and W. H. Wang, Mechanical Behavior of Fe65 5Cr4Mo4Ga4Pi2C5B5 5 Bulk Metallic Glass, Intermetallics, 13, 764 (2005). 

A. Yu. Vinogradov and V. A. Khonik, Kinetics of Shear Banding in Bulk Metallic Glasses Monitored by Acoustic Emission Measurments, Phil. Mag., 84, 2147 (2004). 

We also list three other alloy phase types of current interest that are not treated here in detail. Quasicrystals are alloy phases partially or completely lacking translational symmetry (see Quasicrystals) they form both equilibrium and nonequilibrium alloy phases. Metallic glasses lack crystalline symmetry entirely they are always metastable and generally require gas-phase deposition or rapid solidification to be retained, although in some cases their equilibration kinetics are so slow that they can be prepared in bulk from the melt (bulk metallic glasses). 

Fig. 3 Elastic performance of bulk metallic glass VIT-001 compared with stainless steel, aluminum, and titanium alloys.

Because of their high strength and large elastic deformation, bulk metallic glasses are emerging as structural materials for MEMS and other devices. As the name suggests, these metal alloys have no inherent crystalline structure, and exhibit decidedly different indentation... 

Schuh, C.A. Nieh, T.G. A nanoindentation study of serrated flow in bulk metallic glasses. Acta Mater. 2003, 51, 87-99. 

Bulk metallic glasses were prepared in the Pd-Ni-P and Pd-Cu-P systems using a fluxing technique. The formation of bulk amorphous Pd-Cu-P alloys was reported here for the first time. For both alloy systems, bulk glass formation requires maintaining the phosphorus content near 20 at.%. In the Pd-Ni-P system, lO-mm diameter amorphous PdxNigo-xP 20 rods can be formed for 25 x < 60. In the Pd-Cu-P system, 7-mm diameter amorphous Pd Cugg. xPzo rods can be produced for 40 < x 60. 

The range of metallic alloys that have been obtained as bulk metallic glasses... 

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