准晶体及其性能研究进展

发布时间：2018-09-09 08:19

【摘要】：基于准晶体材料目前的研究现状,简要介绍了根据结构对称性的准晶体分类,讨论了周期模型的构建方法以及准晶体与其近似相的关系,总结了块体单准晶的制备工艺,塑性变形过程中缺陷演化,表面结构、表面性能以及其他物理性能的实验研究现状,分析讨论了采用连续介质力学方法、分子动力学模拟方法、Monte Carlo法以及有限元方法研究准晶体的途径和结果.针对准晶通常呈现的低表面能、低摩擦因数、耐磨损、优异的弥散强化特性、高硬度、高弹性模量、高温塑性、高热阻、抗氧化、高电阻和耐腐蚀等特点,展望其作为复合材料增强相、隔热涂层、耐磨减磨涂层材料等的应用前景.指出准晶体目前研究中所存在的高脆性、成品体积小和计算精度低等难题,提出了其工程应用需要进一步研究的问题.
[Abstract]:Based on the current research situation of quasicrystal materials, the classification of quasicrystal according to structural symmetry is briefly introduced. The method of constructing periodic model and the relation between quasicrystal and its approximate phase are discussed, and the preparation process of bulk single crystal is summarized. The present situation of experimental research on defect evolution, surface structure, surface properties and other physical properties during plastic deformation is analyzed and discussed. The molecular dynamics simulation method, Monte Carlo method and finite element method are used to study quasicrystal. Quasicrystals are characterized by low surface energy, low friction coefficient, wear resistance, excellent dispersion strengthening properties, high hardness, high elastic modulus, high temperature plasticity, high thermal resistance, oxidation resistance, high resistance and corrosion resistance, etc. Its applications as reinforced phase, thermal insulation coating, wear resistant and wear reducing coating materials are prospected. The problems of high brittleness, small volume of finished products and low accuracy of calculation are pointed out in the present research of quasicrystal, and the problems that need further study in engineering application are put forward.
【作者单位】：浙江大学机械工程学院;
【基金】：国家自然科学基金(51375436) 国家高技术研究发展计划(2015AA043002) 浙江省重大科技专项(2016C01G5130970)
【分类号】：O753.3

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