(浙江大學 材料科學與工程系， 杭州 310027)
摘 要: 通過機械合金化(MA)制備出未合金化(均勻混合)、部分合金化和完全合金化3種Cu15Ni8Sn(質量分數(shù)， %)粉末，經(jīng)粉末冶金工藝成型。利用X射線衍射儀(XRD)和掃描電鏡(SEM)分析了3種粉末的晶粒尺寸、 畸變能、 晶格參數(shù)和顆粒大小， 測試了合金時效前后的硬度，研究了機械合金化程度對該材料成型性能及其Spinodal調幅分解的影響。 結果表明， 在壓制和燒結性能方面， 未合金化粉末最好，完全合金化粉末稍好于部分合金化粉末； 通過軋制能有效地提高部分和完全合金化粉末制成合金的密度； 冷形變時效后完全合金化粉末制成的合金具有最大峰值硬度， 且過時效時間延長。
關鍵字: 機械合金化； CuNiSn合金； 成型
（Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, P.R.China）
Abstract:Blend, partially prealloyed and completely prealloyed Cu15Ni8Sn powders have been prepared by mechanical alloying, respectively, and thenconsolidated using conventional powder metallurgy method. The grain sizes, strain, crystalline parameter and particle sizes of the three kinds of powders were analyzed by XRD and SEM. The hardness was measured before and after the ageing treatment. The influence on the consolidated properties and the SPINODAL modulation decomposition were studied. The results indicate that the blend powders is the best, completely alloyed powders is slight better than that of partially prealloyed powders, for the properties of the press and sintering. The consolidated density of the partially and the completely prealloyed powders can be effectively improved by rolling. The alloy that made of completely prealloyed powders has highest hardness, and its over ageing time has been delayed, in the cold worked ageing.
Key words: mechanical alloying； CuNiSn alloy； consolidation
