La 促使 Cu-Cr-Zr 合金在传统热机械处理过程中显著提高强度

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization Pub Date : 2024-10-22 DOI:10.1016/j.matchar.2024.114488

Yu Xiao , Song-Wei Wang , Hong-Wu Song , Shuai-Feng Chen , Qi Yu , Shi-Hong Zhang

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引用次数: 0

摘要

采用工业适用的两步冷轧和时效处理方法，加工出了不同 La 添加量（0 %、0.07 % 和 0.14 wt%）的 Cu-1Cr-0.1Zr 合金，以获得优异的强度和导电性。在第二次轧制和随后的时效阶段，研究了添加 La 对 Cu-1Cr-0.1Zr 合金微观结构演变和综合性能的影响。在预时效过程中，与不含 La 的 Cu-1Cr-0.1Zr 合金相比，Cu-1Cr-0.1Zr-0.07La 合金中 La 的存在导致形成较小尺寸的沉淀。这有利于在二次轧制过程中加强位错与沉淀之间的切削作用，促进沉淀重新溶解到铜基体中，从而使 Cu-1Cr-0.1Zr-0.07La 合金的电导率大幅下降，ICAS 下降了 44.72%。经过后时效处理后，析出物是新形成的，铬析出物的数量增加，尺寸细化，并与基体保持一致的关系。此外，La 的加入促进了富铬相的析出和位错的积累。因此，添加 0.07wt%La 后，拉伸强度显著提高了 11%。而添加 0.14La 的合金在 440 °C 下时效 180 分钟后，抗拉强度达到 600 MPa，导电率达到 80.08 %IACS。强度的提高主要归因于沉淀强化和位错强化。这项研究提供了新型 Cu-1Cr-0.1Zr 合金，并为制造高性能铜合金板材提供了合适的工业热机械处理方法。

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La drives the remarkable strength enhancement of the Cu-Cr-Zr alloy through traditional thermo-mechanical treatment

The Cu-1Cr-0.1Zr alloy with different La addition (0 %, 0.07 % and 0.14 wt%) was processed using industry suitable two-step cold rolling and aging treatment to achieve superior strength and electrical conductivity. The role of La addition on the microstructure evolution and comprehensive properties of the Cu-1Cr-0.1Zr alloy is investigated during the second rolling and subsequent aging stages. During pre-aging process, the presence of La in the Cu-1Cr-0.1Zr-0.07La alloy led to formation of smaller precipitate sizes compared to La-free Cu-1Cr-0.1Zr alloy. This facilitates a stronger cut interaction between dislocations and precipitates during secondary rolling process, which promotes the redissolution of precipitates into Cu matrix and thus results in a larger decline of 44.72 % ICAS for the electrical conductivity of Cu-1Cr-0.1Zr-0.07La alloy. After post-aging treatment, precipitates are newly formed with increased number and refined size of Cr precipitates with maintaining a coherent relationship with the matrix. Besides, the addition of La promotes Cr-rich phase precipitation and dislocation accumulation. Resultantly, remarkable increase in tensile strength by 11 % with the addition of 0.07wt%La. While, the 0.14La added alloy exhibits comprehensive properties of tensile strength 600 MPa and electrical conductivity 80.08 %IACS after aging at 440 °C for 180 min. The increase in strength was primarily attributed to precipitation strengthening and dislocation strengthening. This work provides new kinds of Cu-1Cr-0.1Zr alloy and industrial suitable thermo-mechanical treatment for fabricating high performance cooper alloy sheets.

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来源期刊

Materials Characterization 工程技术-材料科学：表征与测试

CiteScore

7.60

自引率

8.50%

发文量

746

审稿时长

36 days

期刊介绍： Materials Characterization features original articles and state-of-the-art reviews on theoretical and practical aspects of the structure and behaviour of materials. The Journal focuses on all characterization techniques, including all forms of microscopy (light, electron, acoustic, etc.,) and analysis (especially microanalysis and surface analytical techniques). Developments in both this wide range of techniques and their application to the quantification of the microstructure of materials are essential facets of the Journal. The Journal provides the Materials Scientist/Engineer with up-to-date information on many types of materials with an underlying theme of explaining the behavior of materials using novel approaches. Materials covered by the journal include: Metals & Alloys Ceramics Nanomaterials Biomedical materials Optical materials Composites Natural Materials.