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Relationship and mechanism between double cold rolling-aging process, microstructure and properties of Cu-Ni-Si alloy prepared by two-phase zone continuous casting

机译：双冷轧轧制工艺，三相区连续铸造制备Cu-Ni-Si合金微观结构和性能的关系及机理

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摘要

Developing Cu-Ni-Si alloy with high strength and high electrical conductivity is a key issue in the electrical conductor industries. The C70250 copper alloy was prepared by two-phase zone continuous casting (TZCC) technology first, and then carried out by double cold rolling-aging process. The relationship between different double cold rolling-aging processes, microstructure, mechanical properties and electrical conductivity of the alloy was studied in detail, the mechanism was revealed. The results show that the C70250 copper alloy strip fabricated by TZCC technology can be subjected to large deformation double cold rolling-aging treatment. When the alloy is primary cold rolled by 97.5% reduction rate, primary aged at 400 °C for 30 min, second cold rolled by 60% reduction rate, second aged at 400 °C for 45 min, the tensile strength and electrical conductivity of the alloy can reach 879 MPa and 48.9% IACS respectively, owning excellent comprehensive properties. The Ni_2Si phases inside C70250 copper alloy after primary aging effectively pin dislocations during the secondary cold rolling process, which forms high density dislocation entanglement, promotes the further precipitation of Ni_2Si phase during the process of secondary aging, and finally produces a large number of fine, dispersed, multi-scale mixed and evenly distributed Ni_2Si phases, the increase of alloy strength is mainly ascribed to dislocation and Orowan strengthening effect. Solute atoms inside the C70250 copper alloy get adequately precipitated after large deformation double cold rolling-aging treatment, the recrystallization is delayed, and the fibrous microstructure along the rolling direction is produced, the scattering effect of transverse grain boundaries and solute atoms on electrons is significantly reduced, which is helpful to improve the electrical conductivity of the C70250 copper alloy.
机译：开发具有高强度和高导电性的Cu-Ni-Si合金是电导体行业的关键问题。通过双相区连续铸造（TZCC）技术首先制备C70250铜合金，然后通过双冷轧辊老化工艺进行。详细研究了不同双冷轧制工艺，微观结构，机械性能和电导率之间的关系，揭示了该机制。结果表明，TZCC技术制造的C70250铜合金条带可以进行大变形双冷轧辊老化处理。当合金的初级冷却率为97.5％的减少速率时，初级老化在400℃下30分钟，第二次冷轧率为60％，400℃下降45分钟，拉伸强度和电导率合金可分别达到879MPa和48.9％的IACS，拥有出色的综合性质。在初级老化后C70250铜合金内的Ni_2SI相位有效地在二次冷轧过程中销位错，其形成高密度位错缠结，促进继发性衰老过程中Ni_2SI相的进一步沉淀，最终产生大量罚款，分散，多尺度混合且均匀分布的Ni_2SI阶段，合金强度的增加主要归因于位错和orowan强化效果。在C70250铜合金中溶质原子在大变形双冷轧制处理后充分沉淀，重结晶延迟，并产生沿轧制方向的纤维微观结构，横向晶界和溶质原子对电子的散射效应显着显着降低，这有助于提高C70250铜合金的电导率。

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  • 来源
    《Materials Science and Engineering》 |2020年第21期|140148.1-140148.11|共11页
  • 作者

    Wanneng Liao; Xuefeng Liu; Yaohua Yang;

  • 作者单位

    School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China;

    School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China Beijing Laboratory of Metallic Materials and Processing for Modem Transportation University of Science and Technology Beijing Beijing 100083 China Key Laboratory for Advanced Materials Processing of Ministry of Education University of Science and Technology Beijing Beijing 100083 China;

    School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China;

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  • 正文语种 eng
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  • 关键词

    Cu-Ni-Si alloy; TZCC; Double cold rolling-aging process; Microstructure; Properties; Influence mechanism;

    机译：Cu-Ni-Si合金;TZCC;双冷轧辊老化过程;微观结构;特性;影响机制;

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