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Quasicrystals
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作者 Feridoun Samavat Mohammad Hossein Tavakoli +2 位作者 Safdar Habibi Babak Jaleh Parisa Taravati Ahmad 《Open Journal of Physical Chemistry》 2012年第1期7-14,共8页
Quasicrystals are material with perfect long-range order, but with no three-dimensional translation periodicity. They are typically binary and ternary metallic alloys. Quasicrystals have characteristic physical proper... Quasicrystals are material with perfect long-range order, but with no three-dimensional translation periodicity. They are typically binary and ternary metallic alloys. Quasicrystals have characteristic physical properties. Some resemble those of periodic crystals while others have similar properties to amorphous alloys. Many of their mechanical physical prop- erties are quite unusual by the standards of common metals. The peculiar physical properties of quasicrystals certainly give rise to the hope that they may become of some practical importance in the future. Some of these properties are surface related. This provides the main motivation for surface scientists to study this material. In this paper;quasicrystals, types of them, physical properties, surface science and potential applications of them have been discussed. 展开更多
关键词 quasicrstals ICOSAHEDRAL QUASICRYSTALS Polygonal QUASICRYSTALS Aperiodic INTERMETALLICS
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含双周期裂纹的一维六方准晶电弹性全平面应变基本问题 被引量:10
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作者 时朋朋 李星 《应用力学学报》 CAS CSCD 北大核心 2014年第2期251-256,313,共6页
针对电极化方向沿准周期方向的情况,讨论了周期平面内含双周期裂纹的一维六方准晶的电弹性全平面应变第一基本问题和第二基本问题。根据力的叠加原理,将三维的应力系统分解为线性独立的两组二维应力状态;运用复应力函数方法将弹性平衡... 针对电极化方向沿准周期方向的情况,讨论了周期平面内含双周期裂纹的一维六方准晶的电弹性全平面应变第一基本问题和第二基本问题。根据力的叠加原理,将三维的应力系统分解为线性独立的两组二维应力状态;运用复应力函数方法将弹性平衡状态的求解归结为求解正则型积分方程,并证明了其唯一可解性。结果表明:一维六方准晶双周期断裂问题在广义双周期边界条件下的力学解是存在并且唯一的。此结果为运用各种方法研究该基本问题的正确性和一致性提供了理论保证。 展开更多
关键词 一维六方准晶 双周期裂纹 全平面应变 唯一可解性
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