Characterization and Control of Clustering of Different Foreign Elements in Environmentally Friendly Copper-based Alloys

环保铜基合金中不同外来元素团聚的表征及控制

• 批准号: 17310041
• 负责人: SUZUKI Shigeru
• 金额: $ 7.49万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2005
• 资助国家: 日本
• 起止时间: 2005 至 2006
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17310041/
• 关键词: copper based alloys; aging; precipitates; X-ray structural analysis; environmentally friendly

The optimum composition and processing for preparing environmentally friendly copper based alloys, which are not contain toxic beryllium but reveal high performance in the strength and conductivity, were investigated. In order to reduce impurity elements, copper-titanium and copper-nickel-silicon alloys showing aging characteristics were prepared from high purity materials. The hardness and electrical resistivity of different alloys were systematically measured during isochronal annealing. The results showed that precipitation took place in the temperature range between 600K and 750K in these alloys.Small angle X-ray scattering (SAXS) and other techniques were used for characterizing clustering of alloying elements in the alloys, which were annealed at 720K isothermally. The results showed that the hardness increased and the resistivity decreased (that is an increase of the conductivity), when the effective radius estimated in the distance distribution function was from 2 nm to 3 nm. However, the samples were aged for more long time, the hardness of the alloys decreased again, indicating overaging. Thus, there is the optimum distribution of clustering of alloying elements for obtaining the high properties.In addition, anomalous small angle X-ray scattering (ASAXS) was utilized for characterizing the clustering of nickel in Cu-Ni-Si alloys. The results revealed that nickel were precipitated in a size of ca. 2-3 nm. X-ray absorption spectroscopy was also utilized for analyzing the local structure of nickel in Cu-Ni-Si alloys. The EXAFS and XANES spectra showed that the local structure and electric state of nickel precipitated were different from that in those fcc alloy matrix

研究了制备环境友好型铜基合金的最佳成分和工艺，该合金不含有毒铍，但具有较高的强度和导电性。为了减少杂质元素，采用高纯度材料制备表现出时效特性的铜钛合金和铜镍硅合金。在等时退火过程中系统地测量了不同合金的硬度和电阻率。结果表明，合金在600K~750K温度范围内发生析出。采用小角X射线散射(SAXS)等技术对合金中合金元素的团簇进行表征，并在720K等温退火。结果表明，当距离分布函数中估计的有效半径为2 nm至3 nm时，硬度增加，电阻率降低（即电导率增加）。然而，当样品时效时间较长时，合金的硬度再次下降，表明出现过时效。因此，合金元素团簇存在最佳分布，以获得高性能。此外，利用反常小角X射线散射(ASAXS)来表征Cu-Ni-Si合金中镍的团簇。结果表明，镍以大约尺寸沉淀。 2-3纳米。 X射线吸收光谱也用于分析Cu-Ni-Si合金中镍的局部结构。 EXAFS和XANES光谱表明镍析出物的局部结构和电态与fcc合金基体不同。

项目成果

Improvement in strength and electrical conductivity of Cu-Ni-Si alloys by aging and cold rolling

• DOI: 10.1016/j.jallcom.2005.09.037
• 发表时间: 2006-06-29
• 期刊: JOURNAL OF ALLOYS AND COMPOUNDS
• 影响因子: 6.2
• 作者: Suzuki, S.;Shibutani, N.;Waseda, Y.
• 通讯作者: Waseda, Y.

Anomalous Small Angle X-ray Scattering of Nano-Structured Precipitates in Cu-Ni-Si Alloys Using BL15XU

使用 BL15XU 对 Cu-Ni-Si 合金中纳米结构析出物进行反常小角 X 射线散射

• 发表时间: 2005
• 期刊: SPring-8 User Experiment Report 14
• 作者: Y.Takahashi et al.;Y.Takahashi et al.;Y.Takahashi;S.Suzuki et al.;S.Suzuki et al.;S.Suzuki;S.Suzuki et al.
• 通讯作者: S.Suzuki et al.

SAXS and EXAFS characterization of precipitation in a high performance Cu-Ni-Si alloy

高性能 Cu-Ni-Si 合金中沉淀的 SAXS 和 EXAFS 表征

• 发表时间: 2007
• 期刊: Materials Transaction 48・2
• 作者: Y.Takahashi et al.