Tensile Properties of Iron-base Amorphous Alloy (Fe-P-C) Quenched from Liquid

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The elastic, plastic and fracture behavior under tension and the changes in these properties during and after heating at various temperatures have been studied for amorphous Fe_<80>-P_<15>-C_5 alloy. Amorphous specimens were prepared in the shape of ribbons about 30μ thick and 0.5 mm wide using a centrifugal quenching apparatus. The mechanical tests were performed in the temperature range between -195 and 500℃ at strain rates from 6.7×10^<-5> to 6.7×10^<-2> per sec. The amorphous alloy exhibits extremely high strength, with about 230 kg/mm^2 in proportional limit, about 310kg/mm^2 in fracture strength and about 12.4×10^3kg/mm^2 in Young's modulus. Its tensile elongation is only 0.03 % at room temperature. The fracture strength decreases slightly with increasing strain rate. The tensile strength and Young's modulus depend strongly upon temperature, and the fracture elongation increases rapidly above about 300℃. The fracture by localized shear deformation occurs over a wide temperature range of -195 to about 300℃. The fracture surface consists of a smooth part produced by shear slip and a vein-like part produced by plastic instability. Transformation from the amorphous to crystalline phase makes the alloy brittle, resulting in the depressed fracture strength.

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