Effect of Co addition on hardness and electrical conductivity of Cu–Si alloys

Lei, Chenhui; Yang, Hanyu; Zhang, Feng; Fang, Xiaoyang; Fang, Youtong; Meng, Liang; Liu, Jiabin; Wang, Hong-Tao

doi:10.1007/s10853-021-06251-z

Cited by 10 publications

(8 citation statements)

References 32 publications

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“…The preparation process and testing of properties (hardness and EC) of Cu-Co-Si alloys had been described in detail in previous work, so the existing content was omitted to avoid duplication. [20,21] Considering that the eddy current conductivity measurement has been applied to Cu-Fe-P alloys, [7] Cu-Cr-Zr alloys, [8,9] and Cu-Ni-Si alloys, [10] the EC of Cu-1.6Co-0.4Si alloy was retested by an eddy current conductivity meter (FQR-7501) to verify the credibility of experimental data. The schematic illustration of electrolytic corrosion for the Cu-Co-Si alloys is shown in Figure S1, Supporting Information.…”

Section: Methodsmentioning

confidence: 99%

“…Subsequently, the powder obtained by electrolysis was added to anhydrous ethanol, followed by centrifugation and vacuum drying to get a dry powder and then subjected to an X-ray diffraction (XRD) test. The electrolytic treatment method prior to XRD testing has been exploited in our previous work [20] and in other copper alloys. [27] The principle of electrolytic treatment is similar to that of extraction in chemical experiments.…”

Section: Methodsmentioning

confidence: 99%

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Effects of Co/Si Atomic Ratio on Hardness and Electrical Conductivity of Cu–Co–Si Alloys

Zhang

Lei

et al. 2022

Adv Eng Mater

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Cu–Co–Si alloys are being intensively studied as alternative candidates for Cu–Ni–Si alloys for integrated circuit lead frames. However, the effects of different precipitate types on the comprehensive properties of Cu–Co–Si alloys are not clear. Herein, several Cu–Co–Si alloys with various precipitates (CoSi, Co2Si, and Co) are designed based on phase diagrams calculation. The designed alloys are melted, cold‐rolled, and aged to test the corresponding hardness and electrical conductivity (EC). X‐ray diffraction and transmission electron microscopy are utilized to analyze the precipitates generated in those alloys. In the alloys with Co/Si ≤ 1, the excess Si atoms are not easy to precipitate from the copper lattice after CoSi precipitation, which seriously damages the EC. Co‐precipitation in alloys with Co/Si > 2 is beneficial to improve EC without sacrificing hardness. According to thermodynamic calculation, precipitates in Cu‐1.62Co‐0.35Si (wt%) alloy with total elements between 1.5 and 2.0 wt% are all Co2Si and have the highest mass fraction in the equilibrium state. The different precipitates are highly dependent on the Co/Si atomic ratio and essential to Cu–Co–Si alloys’ mechanical and electrical performances.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Effects of Co/Si Atomic Ratio on Hardness and Electrical Conductivity of Cu–Co–Si Alloys

Zhang

Lei

et al. 2022

Adv Eng Mater

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“…The experimental results of the resistivity changes were processed using the CurveExpert Basic. Approximation dependences in the form of algebraic expressions y = a + bx + cx 2 were obtained (see Table 2, which describes the dependences of Fig. 1).…”

Section: Studies and Considerationmentioning

confidence: 99%

“…Such a state of the first one compared to the second underlines the exceptional importance of internal mechanical stresses [13] and nanoprecipitants [14], more precisely Co-Si precipitates [2], in the evolving of mechanisms of nanoscale stabilization of the HEAs. It manifests itself in the exceptional stability of specific electrical conductivity, as structurally-sensitive characteristics.…”

Section: Consideration Of Mechanisms and Identification Of Possible R...mentioning

confidence: 99%

“…Some studies of high-entropy alloys (HEAs) [1][2][3] for the needs of various branches of science and technology have demonstrated the following. The HEAs are characterized "as a superb specific strength, excellent mechanical performance at high temperature, exceptional ductility and fracture toughness at cryogenic temperatures, superparamagnetism, and superconductivity" [3].…”

Section: Introductionmentioning

confidence: 99%

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Electrical Properties of Ti-Cu-Co-Si High-Entropy Alloy

Yatsyshyn¹,

Skoropad²,

Karpinski³

2022

MEM

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To study the metrological characteristics, there were studied manufactured based on the Ti-Cu-Co-Si alloy, obtained by quenching from the melt, the sensitive element of the resistance thermotransducer. The instability of its metrological characteristics as a function of temperature up to 350 oC and operation time up to 3000 hours was investigated; it does not exceed 0.025% under the worst operating conditions. In addition, the methodological error of measurement caused by heating of the sensitive element by the measuring current was examined. It was shown that the recorded changes in electrical resistance were outside the value of the methodological error. They may be due to the presence of nanostructured fields of mechanical stresses and the formation of nanoprecipitates as a consequence of manufacturing.

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