High-strength and high-conductivity cu-ag-sc alloy and preparation method thereof

A preparation method of a high-strength and high-conductivity Cu—Ag—Sc alloy, comprising the following steps:

• (1) placing metal Ag and metal Sc in an electric-arc furnace and smelting the metal Ag and the metal Sc under a vacuum condition, then performing cooling to normal temperature in the furnace to obtain an Ag—Sc intermediate alloy, wherein the Ag—Sc intermediate alloy includes 0.5-5 wt % Sc;
• (2) placing the Ag—Sc intermediate alloy, an electrolytic copper and the metal Ag in an induction furnace and performing heating to 1200-1300° C. under a vacuum condition, keeping at the temperature for 10-60 min for smelting, then performing casting and cooling to normal temperature in the furnace to obtain ingots, wherein the components of the ingots are:
• 1-10 wt % Ag, 0.05-0.5 wt % Sc and a balance Cu;
• (3) heating the ingots to 700-850° C. under an inert atmosphere and keeping at the temperature for 1-15 h for heat treatment, then performing water quenching to normal temperature to obtain heat-treated ingots;
• and
• (4) heating the heat-treated ingots to 400-500° C. under an inert atmosphere and keeping at the temperature for 2-20 h for aging treatment, then performing air cooling to normal temperature to obtain the high-strength and high-conductivity Cu—Ag—Sc alloy, wherein hardness and electrical conductivity of the high-strength and high-conductivity Cu—Ag—Sc alloy are 88-148 HV and 83-88% IACS, respectively.