机械合金化制备Cu-Cr合金时效强化特性的研究  

Study on Age Hardening Characteristics of Cu-Cr Alloy Prepared by Mechanical Alloying

作　　者：王德宝[1] 吴玉程[1] 王文芳[1] 宗跃[2] 黄新民[1] 

机构地区：[1]合肥工业大学材料科学与工程学院,安徽合肥230009 [2]合肥工业大学复合材料公司,安徽合肥230009

出　　处：《热处理》2009年第1期30-33,共4页Heat Treatment

基　　金：安徽省"十五"二期科技攻关项目(040020392);合肥市重点科技攻关项目(20051004);安徽省自然科学基金(070414180)

摘　　要：采用机械合金化工艺制成Cu-Cr合金粉末,然后热压成形制备铜铬合金。采用XRD、TEM分析机械合金化过程中Cu-Cr合金粉末的显微组织和晶粒大小,测试了热压成形后Cu-Cr合金的力学和电学性能,探讨了材料的强化机制和热压温度对组织性能的影响。结果表明,Cu-Cr合金粉末可通过机械合金化获得过饱和固溶体,热压成形后,组织细小均匀,具有优良的综合性能。该合金经840℃热压并保温2 h后,其强度达最大值,显微硬度为205.3 HV,抗拉强度633.5 MPa,电导率为80.4%IACS。合金中过饱和的Cr原子的作用是使合金沉淀强化。Cu-Cr alloy powders were fabricated by a mechanical alloying and then became Cu-Cr alloy through a hot pressing method. The microstructure and the grain size of Cu-Cr powders during the mechanical alloying process were investigated by means of XRD and TEM . The mechanical and electric properties of Cu-Cr alloy were studied after the hot-pressing and sintering processes. The strengthening mechanism and the effect of hot-pressing tempera- ture on the microstructure and property were discussed regarding Cu-Cr alloy. The experimental results show that the supersaturated solid solution of Cu-Cr alloy powders will be produced by the mechanical alloying process and that Cu-Cr alloy with fine and uniform microstructure and excellent overall characteristics will be obtained after the hot-pressing process. Cu-Cr alloy hot-pressed at 840℃ and subsequently heated at the same temperature for 2 h will obtain the highest strength, with microhardness, tensile strength and conductivity being 205.3 HV, 633.5 MPa and 80.4% IACS respectively. The supersaturated chromium atoms in the alloy will play a precipitation-strengthening role.

关 键 词：CU-CR合金 机械合金化 热压成形 时效强化 

分 类 号：TF123.23[冶金工程—粉末冶金] TG166.2[冶金工程—冶金物理化学]