摘要
采用三室真空冷型竖引连铸技术制备了Cu-2Ag合金线材,研究了不同拉拔变形量对Cu-2Ag合金微观组织、力学性能和电导率的影响。结果表明,Cu-2Ag合金线材铸态微观组织以排布分散的"纺布"形枝晶为主,随着变形量的增大,晶粒逐渐细化、破碎,横截面微观组织被挤压、扭折,晶界变得模糊。纵截面形成纤维组织,随着变形量增加,纤维状晶粒间距减小,且边部纤维组织间距小于芯部。经多道次连续拉拔后,抗拉强度从铸态的205 MPa快速升高至594 MPa,伸长率由38%下降至3.5%,电导率由53.418 MS/m下降至50.750 MS/m。SEM断口分析表明,合金断裂方式从韧窝断裂转变为剪切断裂。
Cu-2 Ag alloy wire rod was prepared by three chamber vacuum cold mold vertical drawing continuous casting technology.The effects of different drawing deformation on microstructure,mechanical properties and electrical conductivity of Cu-2 Ag alloy were investigated.The results reveal that the as-cast microstructure of Cu-2 Ag alloy wire rod is mainly distributed in the form of dispersed"spinning cloth"dendrites.With the increase of deformation,the grains are gradually refined and broken,and the cross-section microstructure is extruded and twisted,so the grain boundary becomes fuzzy.Fiber structure is formed in the longitudinal section.With the increase of deformation,the fiber grain spacing is decreased,and the outer fiber structure spacing is smaller than the core.The tensile strength is increased rapidly from 205 MPa to 594 MPa,the elongation is decreased from 38%to 3.5%,and the electrical conductivity is decreased from 53.418 MS/m to 50.750 MS/m through multi pass continuous drawing.SEM fracture analysis shows that the fracture mode is characterized by dimple fracture into shear fracture.
作者
袁鹏飞
皇涛
宋克兴
苏娟华
周延军
曹军
程楚
张朝民
张学宾
Yuan Pengfei;Huang Tao;Song Kexing;Su Juanhua;Zhou Yanjun;Cao Jun;Cheng Chu;Zhang Chaomin;Zhang Xuebin(College of Material Science and Engineering,Henan University of Science and Technology;Provincial and Ministerial Co-construction Collaborative Innovation Center of Nonferrous New Materials and Advanced Processing Technology;Henan Key Laboratory of Nonferrous Materials Science and Processing Technology;Henan School of Mechanical and Power Engineering,Polytechnic University)
出处
《特种铸造及有色合金》
CAS
北大核心
2020年第11期1294-1298,共5页
Special Casting & Nonferrous Alloys
基金
国家重点研发计划基金资助项目(2017YFB0306400)
河南省创新引领专项基金资助项目(191110210400)
河南省高等学校重点科研资助项目(19A430012)
洛阳市科技重大专项基金资助项目(1901006A)
河南省杰出人才创新基金资助项目(182101510003)
关键词
多道次连续拉拔
Cu-2Ag合金
变形量
组织和性能
Multi Pass Continuous Drawing
Cu-2Ag Alloy
Deformation
Microstructure and Properties
