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Fabrication and Characterization of CuO nanowires on V-shaped Microgroove surfaces
Deng Daxiang,Zheng Jian,Xiaolong Chen,Sun Wei 한국물리학회 2021 Current Applied Physics Vol.28 No.-
This study developed a facile and scalable thermal oxidation method to prepare CuO nanowires on the electrodischarge machining (EDM) processed V-shaped microgrooves. The formation feasibility, surface morphology, and wetting properties of nanowires on V-shaped microgrooves were explored by the variation of thermal oxidation temperatures from 300 to 600 ◦C, and oxidation times from 2 h to 8 h. Nanowires were found to successfully synthesized on the V-shaped microgrooves surfaces when annealing temperature was 400 ◦C or higher. The microvoids or microcavities on the EDM processed V-shaped microgrooves surfaces contributed to the stress grain boundary (GB) diffusion of copper atoms, and facilitated the growth of nanowires. The diameter of nanowires increased monotonically when the annealing temperatures increased, whereas it almost kept unchanged with increasing annealing times. The length of nanowires was influenced positively by both annealing temperature and annealing time. All the nanowire samples showed hydrophobic properties of water.
Lingying Ye,Yu Dong,Shengdan Liu,Haichun Jiang,Daxiang Sun,Xinming Zhang 대한금속·재료학회 2018 METALS AND MATERIALS International Vol.24 No.5
The effects of pre-ageing on the microstructure and mechanical properties of T9I6 treated 2519A aluminium alloy wereinvestigated by hardness testing, tensile testing, transmission electron microscope, high resolution transmission electronmicroscope and differential scanning calorimetry. With the increase of pre-ageing time from 40 min to 4 h, the strength tendsto increase fi rst and then decrease; the pre-ageing time of 80 min results in the highest 0.2% proof strength and ultimatetensile strength of 491.9 and 513.8 MPa, respectively, and a high elongation of 14.6%. Pre-ageing is favorable for the formationof a number of primary GP zones, which can greatly improve the distribution of dislocations introduced by subsequentpre-deformation and secondary GP zones introduced by subsequent interrupted ageing. As a result, the number of precursorsfor θ′ hardening precipitates is maximized and the mechanical properties is improved after fi nal re-ageing.