Effect of composition and thermal history on deformation behavior and cluster connections in model bulk metallic glasses.

The compositional dependence and influence of relaxation state on the deformation behavior of a Pt-Pd-based bulk metallic glasses model system was investigated, where platinum is systematically replaced by topologically equivalent palladium atoms. The hardness and modulus increased with rising Pd content as well as by annealing below the glass transition temperature. Decreasing strain-rate sensitivity and increasing serration length are observed in nano indentation with increase in Pd content as well as thermal relaxation.

Bulk metallic glass formation in the (Ti,Zr)-(Ni,Cu)-S system.

New bulk glass-forming alloy compositions, exceeding a critical casting thickness of 1 mm, are developed in the (quasi-ternary) (Ti,Zr)-(Ni,Cu)-S system. The ternary eutectic composition TiNiCu is stepwise modified through additions of S (0-8 at%) and Zr (0-22.5 at%) at the expense of Ni and Ti, respectively.