Four rare-earth elements, La, Ce, Nd and Y are added into pure cop- per, and the effects on the electrical conditivity, hardness, microstrucrure are investigated by experiments. The results show that four rare-earth el- ement La, Ce, Nd and Y in the pure copper are able to make grain refined, so the electric conductivity and the mechanical properities of pure copper is improved. The optimal dosage of La, Ce, Nd and Y are 0.05wt%, 0.06 wt%,0.06wt% and 0.02wr%. Moreover,Y shows the greatest improvemen...
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