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Cu-Ni-Si-xLa 热轧板电导率与 其特征组织的关联机制
Mechanism of the Correlation between the Electrical Conductivity of the Cu-Ni-Si-xLa Hot-rolled Sheets and their Characteristic Microstructures
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- DOI:
- 作者:
- 高博阳1，李 勇1，邹 航1，王艺蕾1，钱晓明2，郭慧稳3
GAOBoyang1, LI Yong1, ZOU Hang1, WANG Yilei1, QIAN Xiaoming2, GUO Huiwen3
- 作者单位:
- 1. 东北大学轧制技术及连轧自动化国家重点实验室，辽宁沈阳110819；2.燕山大学国家冷轧板带装备及工艺工程技 术研究中心，河北秦皇岛066000；3.中铝洛阳铜加工有限公司，河南洛阳471039
1. State Key Laboratory of Hot Rolling Technology and Continuous Mill Automation, Northeastern University, Shenyang 110819, China; 2. National Engineering Research Center for Equipment and Technology of C. S. R., Yanshan University, Qinhuangdao 066000, China; 3. Chinalco Luoyang Copper Processing Co., Ltd., Luoyang 471039, China
- 关键词:
- Cu-Ni-Si-xLa 合金；前处理；细晶强化；显微硬度；抗拉强度；电导率
Cu-Ni-Si-xLa alloy; pretreatment; fine grain strengthening; microhardness; tensile strength; electrical conductivity
- 摘要:
- 为探究稀土La元素的添加对C70250合金组织和性能的作用，利用金相显微镜、扫描电镜、电子背散射衍 射、显微硬度仪、电导率仪及拉伸试验机等研究了Cu-Ni-Si-xLa合金在铸态、均匀化态、热轧态的显微组织、晶粒大小及 分布和析出相的演变过程，分析前处理过程中不同稀土La含量对合金性能的影响规律。结果表明，添加La在铸锭靠外 的区域会出现细晶区域，这个细晶区的晶粒随着La含量的增加先细化再粗化；Base合金和添加0.05%La(质量分数)合 金出现明显的树枝晶，晶界较为模糊。铸锭中加入适量La元素后，产生细晶强化效果，硬度升高。Base合金中再结晶晶 粒分布于纤维状晶粒宽度方向两侧，而加入La合金再结晶晶粒多分布于纤维状晶粒端部并有向晶粒中间生长的趋势， 再结晶晶粒会切断纤维状晶粒使其变短。适量La的添加可提高Cu-2.8Ni-0.66Si合金的轧制态强度，综合性能最好的是 La 的加入量为0.2%，抗拉强度和电导率分别为441MPa和18.2%IACS。To investigate the effects of La addition on the microstructure and properties of C70250 alloys, the microstructure, grain size and distribution, and evolution of precipitates in Cu-Ni-Si-xLa alloys in the cast, homogenized, and hot-rolled states were investigated via optical microscope, scanning electron microscope, electron backscatter diffraction, microhardness testing, electrical conductivity testing, and tensile testing. The influence of different La contents on the alloy performance before processing was analysed. The results show that the addition of La in the outer region of the cast ingot results in the formation of a fine-grained region, and the grain size of this region first refines and then coarsens with increasing La content. The dendritic structure is obvious in the Base alloy and alloy with 0.05 wt.% La added, and the grain boundaries are blurred. After a suitable amount of La is added to the cast ingot, a fine-grain strengthening effect is produced, and the hardness increases. In the Base alloy, the recrystallized grains are distributed on both sides in the width direction of the fibrous grains. However, in the alloy with La added, the recrystallized grains are mostly distributed at the ends of the fibrous grains and tend to grow towards the middle of the grains. The recrystallized grains sever the fibrous grains, thereby leading to a reduction in their length. The addition of an appropriate amount of La improves the hot-rolled strength of the Cu-2.8Ni-0.66Si alloy, and the best comprehensive performance is obtained when the addition of 0.2 wt.% La, with a tensile strength of 441 MPa and an electrical conductivity of 18.2%IACS.