摘要
CuSnTi合金是青铜法制备Nb3Sn超导线材的关键材料,常规铸造法制备的CuSnTi合金晶粒粗大,反偏析现象严重,无法满足制备Nb3Sn线材高伸长率的要求。本研究采用热-力协同强化的思路,通过调控电弧熔炼及热挤压工艺参数,使Cu-15Sn-0.3Ti合金发生再结晶行为,成功制备出组织为细小等轴晶,力学性能良好的高溶质Cu-15Sn-0.3Ti合金。结果表明,在热-力协同作用下,铸态Cu-15Sn-0.3Ti合金中粗大的树枝晶演化为细小的等轴晶,存在于枝晶间隙的富锡相发生回溶,合金组织转变为单一的α相;合金的极限抗拉强度达到387.2 MPa,伸长率达到42.5%,强度与伸长率超过了进口铜锡合金的性能指标。
A CuSnTi alloy is the key material for the preparation of Nb3Sn superconducting wires by the bronze method.Coarse grains and anti-segregation occurred in the Cu-15Sn-0.3Ti alloy prepared by conventional casting,which cannot meet the requirements of high elongation of Nb3Sn wires.In this work,the recrystallization of a Cu-15Sn-0.3Ti alloy was successfully induced by adjusting the process parameters of arc melting and hot extrusion composite processes,and a high-Sn content Cu-15Sn-0.3Ti alloy with fine equiaxed grains and good mechanical properties was prepared by using the idea of thermal-mechanical synergistic strengthening.The results show that under thermal-mechanical synergy,the coarse dendrites in the as-cast Cu-15Sn-0.3Ti alloy evolve into fine equiaxed crystals,the tin-rich phase in the dendrite gap dissolves,and the microstructure of the alloy transforms into a singleαphase.The ultimate tensile strength of the alloy reaches 387.2 MPa,and the elongation reaches 42.5%,which exceeds the performance indices of imported CuSn alloys.
作者
白云飞
邹军涛
孙利星
张喆
王宇轩
BAI Yunfei;ZOU Juntao;SUN Lixing;ZHANG Zhe;WANG Yuxuan(Engineering Research Center of Conducting Materials and Composite Technology,Ministry of Education,Shaanxi Key Laboratory of Electrical Materials and Infiltration Technology,School of Materials Science and Engineering,Xi'an University of Technology,Xi'an 710048,China;Xi'an Zhitong Automation Technology Development Company,Xi'an 710048,China)
出处
《铸造技术》
CAS
2024年第1期56-60,共5页
Foundry Technology
基金
国家重点研发计划(2022YFB3804001)
国家自然科学基金面上项目(52071259)
陕西省科技重大专项(2020zdzx04-04-01子题)
西安市重大科技成果就地转化资助项目(2021SFGX0004)。
