山西省镁工业污染防治现状与对策研究

介绍了国内外镁工业的发展与污染现状，针对山西省镁工业发展与污染的现状以及污染防治中存在的问题，提出了污染防治的对策措施。     

Ⅲ-Ⅴ半导体混晶中DX深中心的一种模型

用TSCAP、DLTS和暗电容瞬态方法研究AlGaAs:Sn中的DX中心.实验表明非指数电容瞬态主要起因于混晶无序作用,并发现DX中心的热发射率激活能随俘获时间加长而增大.提出一种多态模型,DX中心是由一些连续分布态组成,各态属于不同的局域结构,具有不同的电子束缚能和电声耦合能.     

Atomic-scale computer simulation for early precipitation process of Ni75AlxV25-x alloy with intermediate Al composition

The microscopic phase-field approach is applied to model the early precipitation process of Ni75AlxV25-x alloy. Without any prior assumptions, this model can be used to simulate the temporal evolution of arbitrary morphologies and microstructures on atomic scale. By simulating the atomic pictures, and calculating the order parameters and volume fraction of the θ (Ni3V) and γ'(Ni3Al) ordered phases, we study Ni75AlxV25-x alloys with Al composition of 0.05, 0. 053 and 0. 055 (atom fraction). Our calculated results show that,for these alloys, θ and γ' phases precipitate at the same time; with the increase of Al content, the amount of γ' phase increases and that of θ phase decreases; the precipitation characteristic of γ' phase transforms from Non-Classical Nucleation and Growth (NCNG) to Congruent Ordering Spinodal Decomposition (CO SD) gradually; otherwise, the precipitation characteristic of θ phase transforms from Congruent Ordering Spinodal Decomposition (CO SD) to Non-Classical Nucleation and Growth (NCNG) mechanism gradually. Both θ and γ' phases have undergone the transition process of mixture precipitation mechanism characterized by both NCNG and CO SD mechanisms. No incontinuous transition of precipitation mechanism has been found.     

时效对微晶Al—Si系合金α—Al相晶格常数的影响

研究了时效对微晶态Ａｌ－Ｓｉ二元合金和Ａｌ－Ｓｉ－Ｆｅ－Ｃｕ－Ｍｇ多元合金相组成、基体α－Ａｌ相晶格常数的影响。结果表明：时效初期合金中第二相质量分数明显增加，时效一定时间后，第二相质量分数不再变化，而α－Ａｌ相晶格常数一直增大，直至超过纯铝晶格常数值；两种合金时效１００ｈ后，晶格常数趋于一致。     

CPMS类产业的循环经济模式

针对我国铁合金、轻金属和非金属类产业(简称CPMS类产业)资源和能源消耗大、环境污染严重、产品市场竞争力不强的实际情况,分析了该类产业生产过程中高附加值尾气的组成,讨论了其回收、利用途径,提出了该类产业的循环经济发展模式,形成能源、资源—CPMS类产品—尾气—化工产品(电)多联产循环产业链,使我国这类产业走上低能耗、高产出、无污染的绿色科技创新之路并实现可持续发展。     

硬质合金涂层的结合行为

通过氧-乙炔对硬质合金棒材进行了喷涂,分析了涂层组织和界面.结果表明:降低硬质合金棒材的烧成温度,喷涂层与基体形成了良好的冶金结合,冶金结合层改为10 μm,并探讨了其形成机理.     

高性能连铸机结晶器铜板的研制

探讨了连铸技术对结晶器铜板性能的要求 ,在比较国内各种不同类型结晶器铜板性能的基础上 ,确定了研制方案 ,所研制的产品在强度、硬度、耐磨性、导热性等方面均优于国内现有结晶器铜板     

Growth of decagonal quasicrystal phase in laser resolidified Al72Ni12Co16

An ultra-high temperature gradient directional solidification process produced by a widened laser beam was adopted to achieve the directionally solidified microstructure of the stable decagonal quasicrystal phase in Al72Ni12Co16 alloy. X-ray, SEM, TEM and optical microscopy techniques were used to investigate the microstructures and identify the phase. The directionally solidified decagonal quasicrystal showed the facet morphology and grew in lateral growth mode. The unusual periodic and quasiperiodic atomic structures of the decagonal quasicrystal and the epitaxial growth in the melt pool were considered to be the key factors influencing the growth morphology. The experimental results were consistent with the Toner's theoretical atomistic growth model.     

温度对Al-Zn-In-Sn-Mg阳极性能影响的探讨

对Al 5Zn 0 .0 5In 0 .1Sn 1Mg合金牺牲阳极进行 5 10℃× 10h的固溶处理 ,测定了未经固溶处理和经固溶处理的阳极在 2 0℃和 6 5℃ 30 g/L的溶液中的电化学性能 ,并进行交流阻抗测试 .结果表明 :温度升高 ,铝阳极电化学性能和溶解性能变差 ;固溶处理对阳极性能改善有利 ;高温下 ,铝阳极晶粒脱落和析氢自腐蚀更剧烈导致阳极电流效率下降 .