CASTING MOLD MATERIAL AND Cu-Cr-Zr-Al ALLOY MATERIAL

Abstract

A casting mold material used in casting a metal material has a composition including 0.3 mass % or more and less than 0.5 mass % of Cr, 0.01 mass % or more and 0.15 mass % or less of Zr, 0.1 mass % or more and less than 2.0 mass % of Al; and a Cu balance including inevitable impurities and has precipitates in a needle shape or precipitates in a plate shape.

1 . A casting mold material used in casting a metal material, the casting mold material having a composition including:
 0.3 mass % or more and less than 0.5 mass % of Cr;   0.01 mass % or more and 0.15 mass % or less of Zr;   0.1 mass % or more and less than 2.0 mass % of Al; and   a Cu balance including inevitable impurities,   wherein the casing mold material comprises precipitates in a needle shape or precipitates in a plate shape.   
     
     
         2 . The casting mold material according to  claim 1 ,
 wherein sizes of the precipitates in a needle shape or the precipitates in a plate shape are 100 μm or less.   
     
     
         3 . The casting mold material according to  claim 1 , wherein the composition of the casting mold material further comprises:
 0.01 mass % or more and 0.15 mass % or less of one or more elements selected from Fe, Si, Co, and P as a total.   
     
     
         4 . A Cu—Cr—Zr—Al alloy material having a composition including:
 0.3 mass % or more and less than 0.5 mass % of Cr; 
 0.01 mass % or more and 0.15 mass % or less of Zr; 
 0.1 mass % or more and less than 2.0 mass % of Al; and 
 a Cu balance including inevitable impurities, 
 wherein the Cu—Cr—Zr—Al alloy material satisfies a relationship of B/A>1.1 where an electrical conductivity (% IACS) after the Cu—Cr—Zr—Al alloy material is maintained at 1,000° C. for one hour and is then cooled from 1,000° C. to 600° C. at a cooling rate of 10° C./min is defined by A and an electrical conductivity (% IACS) after the Cu—Cr—Zr—Al alloy material is further maintained at 500° C. for three hours is defined by B. 
 
     
     
         5 . The Cu—Cr—Zr—Al alloy material according to  claim 4 , wherein the composition of the Cu—Cr—Zr—Al alloy material further comprises, 0.01 mass % or more and 0.15 mass % or less of one or more elements selected from Fe, Si, Co, and P as a total. 
     
     
         6 . The casting mold material according to  claim 2 , wherein the composition of the casting mold material further comprises:
 0.01 mass % or more and 0.15 mass % or less of one or more elements selected from Fe, Si, Co, and P as a total.