Patent ID: 9627108
Date: 2017-04-18
CPC Classifications: C21D,C22C,C22F,H01B

Claim:
1. A method for manufacturing a metal material, comprising: a temperature increasing step of increasing the temperature of a silver material having undergone final plastic working to 700° C. or more and less than a melting point of the silver material in a vacuum or an inert gas atmosphere; a heating step of maintaining the silver material at 700° C. or more and less than the melting point; and a cooling step of cooling the silver material to room temperature in a vacuum or an inert gas atmosphere, wherein, for a part of the period of the heating step, the silver material is heated in a mixed atmosphere in which hydrogen gas is mixed with an inert gas, and wherein as a result of the heating and cooling steps, a number of lattice defects in the silver material is reduced.