Effect of Yttrium on Microstructure and Properties of High Strength and High Conductivity Cu-Cr-Zr Alloy
A series of Cu-Cr-Zr-Y alloys was prepared by a combination of non-vacuum melting and near-liquid-phase casting methods,which was subjected to solid solution,room-temperature rolling and aging treatment to investigate the effects of rare-earth Y on the structure and characteristics of Cu-Cr-Zr alloys.The results show that the as-cast structure of Cu-0.6Cr-0.14Zr-0.15Y alloy is a uniform fine isometric crystal with an average grain size of about 11 pm.The addition of rare-earth element Y inhibits the precipitation of Cr elements during aging,and the nano-scale Cr,Cu5Zr and CuY precipitation phases and nano-twins appear in Cu-0.6Cr-0.14Zr-0.15Y al-loy with an average size of 5-20 nm and 15 nm,respectively.The Cu-0.6Cr-0.14Zr-0.15Y alloy achieves a ten-sile strength of 550 MPa and a relative electrical conductivity of 85％IACS after solid solution-room temperature rolling-aging,which increases the tensile strength by 27.3％and decreases the relative conductivity by 3.4％compared with the Cu-0.6Cr-0.14Zr alloy under the same post-treatment conditions.
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