Patent ID: 6231697
Filing Date: 2001-05-15
Classification: C22C,C22F

Abstract:
A process for preparing a high-strength alloy having a mixed phase structure consisting of an amorphous phase and a microcrystalline phase, said process comprising preparing an amorphous alloy having a composition represented by the general formula: X.sub.a M.sub.b Al.sub.c T.sub.dwherein X is at least one element selected between Zr and Hf;M is at least one element selected from the group consisting of Ni, Cu, Fe, Co and Mn;T is at least one element having a positive enthalpy of mixing with at least one of the above-mentioned X, M and Al; anda, b, c and d are atomic percentages, provided that 25.ltoreq.a.ltoreq.85, 5.ltoreq.b.ltoreq.70, 0<c.ltoreq.35 and 0<d.ltoreq.15,said process comprising heat-treating said alloy in the temperature range from the first exothermic reaction starting temperature (Tx.sub.1) to the second exothermic reaction starting temperature (Tx.sub.2) to decompose said amorphous phase into said mixed phase structure consisting of an amorphous phase and a microcrystalline phase.