A hard metal alloy member and its manufacturing method

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A hard metal alloy member which comprises a copper alloy comprising copper (Cu) in an amount of 40.00 to 99.45 wt % and, gadolinium (Gd) and at least one element selected from the group consisting of a rare earth element except Gd , an alkaline earth element, zirconium (Zr), tin (Sn), lead (Zn), indium (In), manganese (Mn), beryllium (Be) and cobalt (Co) in an amount of not less than 50 ppm and less than 15000 ppm.