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

概要

論文の詳細を見る
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.
東北大学の論文