Al-4%Cu合金组织的纳米复合化调控与性能  

Regulation of microstructure and properties of Al-4%Cu alloy by adding nanoparticles

作　　者：雷晓维 宋雁飞 张觐韬 史李格 朱雨婧 王朝 LEI Xiao-wei;SONG Yan-fei;ZHANG Jin-tao;SHI Li-ge;ZHU Yu-jing;WANG Zhao(School of Physical Science and Technology,Northwestern Polytechnical University,Xi’an 710072,China)

机构地区：[1]西北工业大学物理科学与技术学院,陕西西安710072

出　　处：《材料热处理学报》2022年第2期10-16,共7页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(51801160)。

摘　　要：以Al-4 mass%Cu合金为研究对象,在熔炼过程中分别加入B_(4)C和TiO_(2)纳米粒子,以期实现组织细化、力学性能和耐腐蚀性能的调控。结果表明,B_(4)C和TiO_(2)纳米粒子的添加均具有细化晶粒作用,合金的晶粒尺寸由毫米级减小至300~500μm,B_(4)C粒子对晶粒的细化作用更强。B_(4)C和TiO_(2)纳米粒子的加入可分别使合金的硬度提高20.4%和27.1%。添加B_(4)C纳米粒子的合金的耐腐蚀性能稍有提升,加入TiO_(2)纳米粒子会降低耐腐蚀性能。点蚀主要发生于晶界和枝晶界,θ(Al_(2)Cu)相是诱发点蚀的主要原因。Taking Al-4 mass%Cu alloy as the research object,B_(4)C and TiO_(2) nanoparticles were added respectively in the melting process in order to realize the microstructure refinement and optimization of mechanical property and corrosion resistance.The results show that the addition of B_(4)C and TiO_(2)nanoparticles can refine the grains,and the grain size of the alloy is reduced from millimeter level to 300-500μm,and the B_(4)C nanoparticles have a stronger effect on grain refinement.The addition of B_(4)C and TiO_(2)nanoparticles can increase the hardness of the alloy by 20.4%and 27.1%,respectively.The corrosion resistance of the alloy with B_(4)C nanoparticles addition is slightly improved,and the addition of TiO_(2)nanoparticles will reduce the corrosion resistance.Pitting corrosion mainly occurs at the grain boundaries and dendritic grain boundaries,and theθ(Al_(2)Cu)phase is the main cause of the pitting corrosion.

关 键 词：铝铜合金 纳米粒子 微观组织 腐蚀性能 析出相 

分 类 号：TG146.2[一般工业技术—材料科学与工程] TB333[金属学及工艺—金属材料]