Glass-forming ability of alloys

Evidently, at least in part, the lower glass forming ability of the alloys containing Sc instead of Ce can be connected with smaller atomic radius of Sc (0.143 nm for Al, 0.164 nm for Sc and 0.183 nm for Ce) because a certain difference in atomic radii of alloy components is one of the necessary conditions for alloy amorphization [4],... 

Sc considerably lowers the glass forming ability of Al alloys compared to rare earth metals (Ce). No amorphous phase was formed in rapidly solidified binary Al-Sc alloys. An unstable quasicrystalline icosahedral phase was first found in the alloy A185Sci5. Substitution of Ce for Sc in Al91Ce9 xScx alloys caused a transfer to a mixed amorphous-nanocrystalline and then to nanocrystalline structure. In Al85Nii0Ce5 xScx alloys a mixed amorphous-nanocrystalline structure appeared in the alloy with x=5 at a lowered solidification rate (increased ribbon thickness). 

Ziewiec et al. [24] reported on the preparation, thermal stability and glass-forming ability of copper-nickel-phosphorus alloys. They found that, depending on the composition, melt spinning may result in either amorphous or partially crystalline systems, whose thermal behaviour was characterized by DSC, DTA, andXRD. 

Several authors have pointed out the influence of the volume contraction on the alloy cohesion. For instance, the volume contraction was linked to the glass forming ability of the alloys. It was found that deviations of 15% or more are required for glass formation. 

Choi,Y. H. Busch, R. Johnson, W. L. (1998). The effect of silicon on the glass forming ability of the Cu47Ti34ZrnNi8 bulk metallic glass forming alloy during processing of composites. Journal of Applied Physics, Vol. 83, No. 12, (Jxme 1998), pp. 7993-7997. ISSN 0021-8979... 

Simozar, S. Alonso, J.A. On the Factors Controlling Glass Forming Ability of Metallic Alloys Formed by Fast Liquid Quenching. Physica Status Solidi (a), Vol. 81, No.l, Ganuary 1984), pp. 55-61, ISSN 1862-6319... 

Of particular importance for the evaluation of the corrosion stability of glassy Mg-based alloys is the analysis of their behaviour in chloride-containing media. The occurrence of local corrosion phenomena is expected to be in strong relation with the defect density of the glassy samples, which depends on the glass-forming ability of the alloy and on the preparation conditions (see Section 5.2). Therefore, the dimensions and micro-structural states of the samples play a very decisive role. 

Ma H, Shi LL, Xu J, Li Y, Ma E, Improving glass-forming ability of Mg-Cu—Y via substitutional alloying effects of AgveTsusNT, Journal of Materials Research,... 

Kim D, Lee BJ, Kim NJ, Prediction of composition dependency of glass-forming ability of Mg-Cu-Y alloys by thermodynamic approach , Scripta Materialia, 2005 52 969-972. 

The Ni-Pd-Cu-P family of alloys shows among the metallic systems the highest glass-forming ability known to date (Inoue et al. 1997, Loftier 2003). 

The ternary alloys of a lanthanide with Al and a late transition metal have very high glass-forming ability and low critical cooling rate bulk samples may be cast. 

A simple method for predicting limits for glass-forming ability (GFA) in metallic alloys was proposed by Saunders and Miodownik (1983). lliey utilised the To criterion to predict the limit to the glass-forming range (GFR) of a number of binary and ternary systems. The To criterion follows the premise diat, if cooling conditions... 

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