발간논문
Home > KJMM 논문 > 발간논문

Vol.31, No.12, 1511 ~ 1519, 1993

Title

Devitrification and High mechanical Strength of Al - based Amorphous alloys

김영환Y . H . Kim, 김종수J . S . Kim, 조형호H . H . Cho, 김성규S . G . Kim, 박세윤S . Y . Park

Abstract

Amorphous Al_(88)Ni_(10-x)Co_xY₂(x=1, 3) alloys were examined for their devitrification characteristics at temperatures above precipitation onset temperature(T_(xl)) of Al phase. The particle size of Al phase increases in the range of 5 to 15㎚ with increasing aging temperatures. With an increase of precipitation amount(V_f) of fcc-Al phase, the thermal stability of remained amorphous phase was significantly enhanced. These devitrified amorphous alloys at V_f=14% exhibit tensile fracture strength(σ_f) and hardness(H_v) which are about 30% higher than those of amorphous single phase alloys with the same composition, without detriment to good bending ductility (e.g., 1360MPa at 14%V_f for Al_(88)Y₂Ni_9Co₁alloy). The σ_f and fracture elongation (ε_f) in the devitrified amorphous alloys decreases with increasing Co content. This compositional effect is presumably due to an increase in embrittlement tendency caused by stronger tendency of structural relaxation in the amorphous phase with increasing Co content.

Key Words

| PDF

발간논문Home > KJMM 논문 > 발간논문

발간논문
Home > KJMM 논문 > 발간논문