机械合金化Cu－5Cr合金的组织性能研究

STRUCTURE AND PROPERTIES OF THE MECHANICALLY ALLOYED Cu-5Cr ALLOY

研究了机械合金化制粉、热静液挤压致密制备的Ｃｕ－５Ｃｒ合金的组织与性能。机械合金化Ｃｕ－５Ｃｒ合金由于细晶强化和弥散强化的作用，具有很高的强度（σｂ≥７５０ＭＰａ），经热处理后，合金具有较高的延伸率（δ≥８％）和导电性（≥６０％ＩＡＣＳ）。材料晶粒达到０．１μｍ级，析出的Ｃｒ粒子达到纳米级。

A Cu-5Cr alloy powder was prepared by mechanical alloying of the mixed elemental Cu and Cr powders and consolidated by hot hydrostatic extrusion, and the microstructrue and properties relationship of this alloy was discussed in the present paper. The high strength(σb≥750MPa) of the mechanically alloyed Cu-5Cr is attributed to both the fine grain strengthening and the dispersion strengthening. The heat treatment could improve the ductility (δ≥8% ) and conductibility (≥ 60 %IACS) of this alloy. In the Cu-5Cr alloy,the average grain size is about 0. 1μm and the precipitated Cr particles are on the level of nanometer.