Contact angles by the solid-phase grain boundary wetting (coverage) in the Co–Cu system
Contact angles by the solid-phase grain boundary wetting (coverage) in the Co–Cu system
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DOI：
10.1007/s10853-010-4377-8
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发表时间：
2010-03
影响因子：
4.5
通讯作者：
B. Straumal;O. Kogtenkova;A. Straumal;Yu. O. Kuchyeyev;B. Baretzky
中科院分区：
文献类型：
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作者：
B. Straumal;O. Kogtenkova;A. Straumal;Yu. O. Kuchyeyev;B. Baretzky
研究了在 880 至 1,085 °C 之间长时间退火（930-2,100 小时）后二元 Co-13.6 wt% Cu 和 Cu-4.9 wt% Co 合金的微观结构。 Cu-4.9 wt% Co 合金中 (Co) 颗粒与 (Cu)/(Cu) 晶界 (GB) 之间的接触角在 50° 至 70° 之间。在 Co-13.6 wt% Cu 合金中，观察到 (Co)/(Co) GB 被第二固相 (Cu) 从不完全润湿（覆盖）转变为完全润湿（覆盖）。完全润湿的 (Co)/(Co) GB 的比例从 Twss= 970 ± 10 °C 开始随着温度的升高而增加，并在 1,040 °C 时达到最大值 15%。该温度非常接近 Co-Cu 合金的居里点 (1,050 °C)。在 1,040 °C 以上，完全润湿的 (Co)/(Co) GB 的数量随着温度的升高而减少，并在 Twsf= 1,075 ± 5 °C 时达到零。首次观察到GB被第二固相从不完全润湿（覆盖）到完全润湿（覆盖）的可逆转变。
The microstructure of binary Co–13.6 wt% Cu and Cu–4.9 wt% Co alloys after long anneals (930–2,100 h) was studied between 880 and 1,085 °C. The contact angles between (Co) particles and (Cu)/(Cu) grain boundaries (GBs) in the Cu–4.9 wt% Co alloy are between 50° and 70°. In the Co–13.6 wt% Cu alloy, the transition from incomplete to complete wetting (coverage) of (Co)/(Co) GBs by the second solid phase (Cu) has been observed. The portion of completely wetted (Co)/(Co) GBs increases with increasing temperature beginning fromTwss= 970 ± 10 °C and reaches a maximum of 15% at 1,040 °C. This temperature is very close to the Curie point in the Co–Cu alloys (1,050 °C). Above 1,040 °C, the amount of completely wetted (Co)/(Co) GBs decreases with increasing temperature and reaches zero atTwsf= 1,075 ± 5 °C. Such reversible transition from incomplete to complete wetting (coverage) of a GB by a second solid phase is observed for the first time.