摘要
Cu-Ni-Si系合金作为第三代引线框架材料,在集成电路领域被广泛使用。La作为储量较大的轻稀土元素在合金制备过程中常用作除杂剂使用,但将其作为微合金化元素的研究与报道尚处于探索阶段。因此本实验选择添加La作为Cu-2.35Ni-0.59Si-0.11Mg-0.069Zn合金的微合金化元素,探究La元素对铸态合金微观组织与性能的改变以及热加工性能差异具有重要的研究价值。热变形流变应力是合金在高温下所展现出的材料一项本征属性,其在后续制定合理的热加工工艺与参数以及金属塑性变形理论研究的方面都有着极其重要的意义。本实验采用Gleeble-3800D热模拟实验机对Cu-Ni-Si和Cu-Ni-Si-La合金进行热压缩模拟实验,探究合金的热变形行为以及热加工特征并求解与绘制出合金本构方程和热加工图。对铸态合金采用OM,SEM等微观表征手段和常规性能检测手段对铸态合金进行全面的研究。结果表明,La元素的添加会细化铸态合金晶粒尺寸但会造成铸态合金延伸率的降低,富La相在晶界上的分布造成晶界发生弯曲。双曲正弦修正的本构方程可以准确描述合金的流变应力与变形温度和应变速率三者间的关系,两种合金的热变形激活能分别为785.6和858.2 kJ·mol^(-1),造成合金热激活能与热加工图差异的原因是La元素添加所形成的富La相对晶界迁移与位错运动的阻碍作用。
As the third generation of lead frame material,Cu-Ni-Si based alloys are widely used in the field of integrated circuits.The rare earth element La,as a light rare earth element with large reserves,is commonly used as an impurity remover in alloy preparation,but the research and report on its use as a microalloying element is still in the exploratory stage.Therefore,in this study,the addition of La as a microalloying element for Cu-2.35Ni-0.59Si-0.11Mg-0.069Zn alloy was selected,and it is of important research value to explore the effects of La on the microstructure and properties of the as-cast alloy and the differences in thermal processing properties.Thermal deformation flow stress is an intrinsic property of materials exhibited by alloys at high temperatures,and it is of great significance in the subsequent development of reasonable hot working processes and parameters,as well as in the theoretical study of metal plastic deformation.This experiment used a Gleeble-3800D thermal simulation experimental machine to conduct thermal compression simulation experiments on Cu-Ni-Si and Cu-Ni-Si-La alloys,explored the thermal deformation behavior and thermal processing characteristics of the alloys,and solved and drew alloy constitutive equations and thermal processing diagrams.Microscopic characterization methods such as OM,SEM,and conventional performance testing methods were used to conduct a comprehensive study of the as-cast alloy.The results show that the addition of La can refine the grain size of the ascast alloy but reduce the elongation of the as-cast alloy.The distribution of La-rich phase on the grain boundary causes the grain boundary to bend.The relationship between the flow stress,deformation temperature,and strain rate of the two alloys is the most consistent with the hyperbolic sinusoidal constitutive relationship.The final calculation results show that the thermal deformation activation energies of the two alloys are 785.6 and 858.2 kJ·mol^(-1),respectively;The reason for the difference between the thermal activation energy and the thermal working diagram of the alloy is due to the blocking effect of the La-rich particles formed by the addition of La on grain boundary motion and dislocation motion.
作者
王铭飞
陈帅峰
张孟枭
王松伟
宋鸿武
张士宏
Wang Mingfei;Chen Shuaifeng;Zhang Mengxiao;Wang Songwei;Song Hongwu;Zhang Shihong(School of Rare Earths,University of Science and Technology of China,Hefei 230026,China;Ganjiang Innovation Academy,Chinese Academy of Sciences,Ganzhou 341119,China;Shi Changxu Advanced Materials Innovation Center,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China)
出处
《中国稀土学报》
EI
CAS
CSCD
北大核心
2024年第5期987-998,I0005,共13页
Journal of the Chinese Society of Rare Earths
基金
中国科学院重点部署项目(ZDRW-CN-2021-3)
中国科学院金属研究所人才引进项目(E055A501)资助。
