镧微合金化对Cu-2.2Ni-0.6Si合金连续挤压-冷轧-时效板带组织和性能的影响
Effect of Lanthanum Micro-Alloying on Microstructure and Properties of Cu-2.2Ni-0.6Si alloy Sheet Via Continuous Extrusion-Cold Rolling-Aging Process
苏泽琪 1陈帅峰 2邓偲瀛 2张孟枭 2宋鸿武 2张士宏2
作者信息
- 1. 中国科学院金属研究所师昌绪先进材料创新中心,辽宁沈阳 110016;中国科学技术大学材料科学与工程学院,辽宁沈阳 110016
- 2. 中国科学院金属研究所师昌绪先进材料创新中心,辽宁沈阳 110016
- 折叠
摘要
为了阐明La微合金化和短流程制备工艺对Cu-Ni-Si合金组织和性能的作用,采用杆坯连续挤压-固溶-冷轧-时效工艺制备了Cu-2.2Ni-0.6Si和Cu-2.2Ni-0.6Si-0.016La两种合金板材.采用金相显微镜(OM)、扫描电镜(SEM)和电子背散射衍射(EBSD)等手段表征了制备过程中合金的组织演变,同时测试并对比分析了杆坯及最终板材的力学性能和导电率变化的原因.结果表明,La微合金化Cu-Ni-Si合金中析出了含La相,通过连续挤压变形使得含La相尺寸减小且呈弥散分布,能够抑制固溶处理过程中的晶界迁移和晶粒长大,使得冷轧时效后品粒纤维间距显著减小;La元素提高了合金再结品温度,减少了时效再结晶晶粒数量,保留了较长的纤维状品粒,最终提高了板材的延伸率.采用短流程工艺制备厚度2 mm的Cu-2.2Ni-0.6Si-0.016La合金板材,抗拉强度为731.3 MPa,延伸率为18.4％,导电率为36.6％IACS,与同样制备工艺下未添加 La的合金板材相比,在抗拉强度略有降低(降低2.9％),导电率无变化的条件下,延伸率提高了32.3％,为发展高塑性Cu-Ni-Si合金提供了研究基础.
Abstract
In order to clarify the effects of La micro-alloying and shorten fabrication process on the microstruc-ture and properties of Cu-Ni-Si alloy,Cu-2.2Ni-0.6Si and Cu-2.2Ni-0.6Si-0.016La alloy sheets were respectively prepared by continuous extrusion-solution-cold rolling-aging processes.The microstructure evolution of two alloy sheets was studied by using OM(Optical microscopy),SEM(Scanned electron microscopy)and EBSD(Elec-tron Backscattered Diffraction),and the mechanical properties and electrical conductivity of the initial rods and the final sheets were tested and analyzed.The results indicate that the La-containing phase is induced in the al-loy with La micro-alloying,of which the size and distribution are reduced and dispersed via continuous extru-sion.The existence of dispersed La-containing phases obviously inhibits the grain growth during solid solution with restrained grain boundary migration.As a result,the grain fiber spacing is significantly reduced after cold rolling.La element increases the recrystallization temperature,reduces the number of aging recrystallized grains,and retains long fibrous grains,which thus improves the elongation of the final sheet.The ultimate tensile strength,elongation and electrical conductivity of micro-La alloying sheet with final thickness of 2 mm were measured to be 731.3 MPa,18.4％and 36.6％IACS,respectively.Compared with the La-free alloywith the same preparation process,the ultimate tensile strength slightly decreases(2.9％)and the electrical conductivity is unchanged,while the elongation increases with amount of 32.3％.This work provides the foundation for devel-oping Cu-Ni-Si alloy with superior plasticity.
关键词
Cu-Ni-Si合金/稀土/La/连续挤压/延伸率Key words
Cu-Ni-Si alloy/rare earth La/continuous extrusion/elongation引用本文复制引用
基金项目
中国科学院金属研究所人才引进项目(E055A501)
江西省重大科技研发专项(20203ABC28W004)
中国科学院重点部署项目(ZDRW-CN-2021-3)
出版年
2024
NETL
NSTL
万方数据