C194合金连续挤压全过程的组织与性能演变  

Microstructure and property development of C194 copper alloy during continuous extrusion

作　　者：靳晨[1] 刘新宽[2] 刘平[1,2] 陈小红[2] 何代华[2] 马凤仓[2] 李伟[2] 

机构地区：[1]上海理工大学机械工程学院,上海200093 [2]上海理工大学材料科学与工程学院,上海200093

出　　处：《功能材料》2016年第4期164-168,共5页Journal of Functional Materials

基　　金：上海市教委创新资助项目(11YZ112);上海市科委基础研究重点资助项目(10JC1411800);上海市教育委员会重点学科建设资助项目(J50503)

摘　　要：采用光学显微镜、透射电子显微镜（TEM）、维氏硬度仪和万能材料试验机等手段对C194合金连续挤压全过程的组织演变与性能特征进行研究.结果表明,C194合金连续挤压过程没有出现明显的动态再结晶组织,仅在直角弯曲后变形区观察到少量沿晶界择优析出的不完全动态再结晶细小晶粒;各变形区硬度随变形量的增加由88.7HV 提升至136.1HV,并在直角弯曲后变形区增长减缓;挤压前后材料抗拉强度由263MPa提高到476MPa,延展性则由26.5%降至18.7%;挤压过程中发生第二相析出,析出物呈现尺寸为60-80nm 的椭球形和尺寸为10-20nm 且弥散分布的微小颗粒两种形貌.The microstructure and property development of C194 copper alloy obtained by continuous extrusion forming(CEF)were investigated with methods of optical microscopy,transmission electron microscopy(TEM),micro-Vickers hardness measurement and universal-testing machine.The results indicate that no massive obvious dynamic recrystallization(DRX)structures are found during the whole CEF process,whereas small amount of incomplete DRX grains are found preferentially precipitated along grain boundaries at afterright-angle bending region.With the increment of plastic deformation,hardness of C194 copper alloy rises from88.7HV to 136.1HV,an increasing rate slowdown occurs at after-right-angle bending region.Tensile strength was drastically promoted from 263 MPa to 476 MPa during CEF process while elongation drops from 26.5%to18.7%.Second-phase precipitate with morphology of ellipsoid measuring 60-80 nm and micro dispersed particles measuring 10-20 nm,respectively,are found during CEF process.

关 键 词：C194合金 连续挤压 组织与性能演变 

分 类 号：TG375.25[金属学及工艺—金属压力加工]