在真空中熔炼和浇铸含有微量稀土的铜合金,拉伸试验和金相观察表明,在Cu中加入0.2％∑Re,使延伸率δ有明显提高。在含2％Zn的铜合金中分别加入0.2％的∑Rs和Y,σ_b和δ均有一定提高,尤其Cu-Zn-Y合金的σ_b提高更为突出,即相对于Cu-Zn合金增长23％。而在含2％Cd的Cu-Cd合金中加入0.1％Y,使σ_b和δ相对增长6.3％和11.8％。上述大部分结果可用稀土降低铜和铜合金中有害杂质的净化作用解释。对于Cu-Zn-Y合金的性能改善,除净化作用因素外,还与稀土细化合金晶粒有关。 Smelting and casting a copper alloy containing a trace amount of rare earth in a vacuum, the tensile test and the metallographic observation showed that 0.2% ΣRe was added to Cu to make the elongation δ significantly increase. The addition of 0.2% ΣRs and Y to the copper alloys containing 2% Zn all increased a little, especially the σ_b increase of Cu-Zn-Y alloys, which was 23% higher than that of Cu-Zn alloys %. However, 0.1% Y was added to Cu-Cd alloy containing 2% Cd to make σ_b and δ increase by 6.3% and 11.8% respectively. Most of the above results can be explained by the purification of rare earths to reduce the deleterious impurities in copper and copper alloys. For Cu-Zn-Y alloy performance improvement, in addition to purification factors, but also with rare earth alloy grain refinement.