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precipitation process and its effects on properties of aging Cu–Ni–Be alloy

Rare Metals 2013年第4期32卷 332-337页

作者： Li-Jun Peng Bai-Qing Xiong Guo-Liang Xie Qiang-Song Wang Song-Bai Hong State Key Laboratory of Nonferrous Metals & process General Research Institute for Nonferrous Metals Yingtan Shine Electric Metal Material Co. Ltd

The precipitation process of aged Cu-Ni-Be alloy was investigated by X-ray diffraction （XRD）, trans- mission electron microscopy （TEM）, and high-resolution transmission electron microscopy （HRTEM）. The tensile strength, yield strength, and electronic conductivity of this alloy after aging were also studied. The precipitation sequence of the C17510 alloy aged at 525 ℃ is supersat-urated solid solution→G.P zones→ γ″-γ′→ γ. This transformation can be achieved by the accumulation of Be-atom layers. The G.P zones are composed of disk-shaped monolayers of Be atoms, which are formed on （001） matrix planes. The intermediate γ″ precipitate is nucleated in the G.P zones. The γ″ and γ′ precipitates have the same orientation relationship with matrix, e.g., （110）p｜｜（100）M,[001]p｜｜[001]M. The tensile strength of specimen shows a maximum during the aging process and then continuously decreases if the specimen is over aged. The strengthening effect of γ′ phase precipitated in aging at 525 ℃ for 4 h is calculated to be 436 MPa according to the Orowan strengthening, which is quite consistent with the experimental data.

关键词： precipitation process C17510 alloy Metastable phases Strengthening mechanism

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Phase-field study on competition precipitation process of Ni-Al-V alloy

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Transactions of Nonferrous Metals Society of China 2015年第2期25卷 544-551页

作者：卢艳丽卢广明贾德伟陈铮西北工业大学凝固技术国家重点实验室西安710072

With microscopic phase-field kinetic model, atomic-scale computer simulation program for the precipitation sequence and microstructure evolution of the ordered intermetallic compound γ＇ and θ in ternary Ni75AlxV25-x alloy were studied. The simulation results show that Al concentration has important effects on the precipitation sequence. When Al concentration in Ni75AlxV25-x alloy is low, 0（Ni3V） ordered phase will be firstly precipitated, followed by γ＇（Ni3Al） ordered phase. With Al concentration increasing, θ and γ＇ ordered phases are simultaneously precipitated. With A1 concentration further increasing, γ＇ ordered phase is firstly precipitated, followed by θ ordered phase. There is a competition relationship between θ and γ＇ ordered phases during growth and coarsening process. No matter which first precipitates, θ ordered phase always occupies advantage in the competition process of coarsening, thus, the microstructure with preferred orientation is formed.

关键词： Ni-Al-V alloy microstructure evolution precipitation process phase-field method

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维普期刊数据库

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Preparation of Spherical Bi_2O_3 Powder by Plasma and precipitation processes

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Plasma Science and Technology 2005年第6期7卷 3139-3142页

作者：陈培荣季幼章冯士芬 Institute of Plasma Physics Chinese Academy of SciencesHefei 230031 China School of Science Anhui Agricultural University Hefei 230036 China Institute of Plasma Physics Chinese Academy of SciencesHefei 230031 China

Spherical Bi2O3 powder prepared by plasma chemical vapor reaction and aqueous chemical precipitation is studied. The superfine spherical Bi2O3 powder with an average diameter of 1 μm is made by plasma process. During the precipitation process, the micrograph of the Bi2O3 powder can be controlled through the reaction temperature, the rate of addition of the precipitation reagent, the reaction time and the amount of the dispersant. Accordingly, spherical Bi2O3 powder with diameters ranging from 2μm to 3μm is prepared. The spherical Bi2O3 particles have such advantages as uniform size distribution and excellent dispersing property. ZnO varistors made from the resultant powder exhibit properties of a low discharge voltage ratio, great eligibility coefficient measured by a rectangle wave of 2 ins 800 A and good stability in the above characteristics.

关键词： spherical Bi2O3 plasma process precipitation process varistor

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