Cu-10Cr-0.4Zr形变原位复合材料的组织演变特征  

Structural Evolution Characteristics of Cu-10Cr-0.4Zr In-situ Composites

作　　者：邓鉴棋[1] 张修庆[1] 尚淑珍[1] 赵祖欣[1] 叶以富[1] 

机构地区：[1]华东理工大学承压系统安全科学教育部重点实验室,上海200237

出　　处：《材料工程》2010年第4期59-62,68,共5页Journal of Materials Engineering

基　　金：上海市重点学科建设项目资助(B503)

摘　　要：制备了Cu-10Cr和Cu-10Cr-0.4Zr合金,并经冷变形形成了原位复合材料。研究Zr添加剂对合金铸态组织和复合材料的纤维形貌的影响,以及随着形变率的提高β-Cr纤维演变特征。研究表明,在Cu-10Cr合金中添加的0.4%（质量分数）Zr,Cr析出相的直径由15-80μm细化到10-20μm;对Cu-10Cr-0.4Zr合金能谱分析表明,在Cu-10Cr-0.4Zr铸态组织中存在Cu5Zr相的形成和析出;随着形变率增大,β-Cr相之间的间距不断减小,其宽厚比也进一步增大,纤维相发生比较明显的弯曲和扭折,特别是当形变率η=6.2时,纤维相的厚度能够达到250-350nm,纤维相变形和分布也趋于均匀;当η=6.2时,Cu-10Cr-0.4Zr形变复合材料的抗拉强度达到1089 MPa,采用改进的Hall-Petch公式计算其值为1037 MPa,理论计算数值与观测结果基本一致。The Cu-10Cr alloy,Cu-10Cr-0.4Zr alloy and the in-situ composite based on the alloys were prepared.Microstructures of as-cast,structural evolution characteristics of Cu-10Cr-0.4Zr in-situ composites were investigated.The results showed that the addition of 0.4%（mass fraction）Zr in the Cu-10%Cr gave birth to smaller as-cast Cr dendrites,their diameters were reduced from 15-80μm to 10-20μm;the EDS quantitative analysis of as-cast Cu-10Cr-0.4Zr alloy showed that the Zr-rich phase should be Cu5Zr;with the increasing of drawing strains,the spacings among the β-Cr phases decreased gradually and the thickness of β-Cr phases decreased rapidly,the β-Cr phases were constrained to fold and twist,particularly at η=6.2,the thickness reached 250-350nm;at η=6.2,the predicted strength using Hall-Petch equation was 1037MPa,which was good agreement with the observed strength 1089MPa.

关 键 词：Cu-10Cr-0.4Zr 铜基原位复合材料 组织演变 强度 

分 类 号：TB331[一般工业技术—材料科学与工程] TG113[金属学及工艺—物理冶金]