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were caused by the mismatch of thermal expansion coefficients of materials during cooling, and the voids were consistent with the Kirkendall effect. The work will lay an important foundation.... Microcracks were the main factor of the fracture. According to results of CHENG and WANG [5], the formation of internal voids resulted from the Kirkendall effect. The different diffusion rates of Fe......
diamond grinding agents, the surface seondary scratch is avoided, and easpecially, the new grinding material is found to deliver a ‘repairing’ effect on the marcoscopic surafce defects of pure Al. Key words: Al62Cu25.5Fe12.5 quasicrystals; grinding material; repairing effect 研磨抛光是一种重要的构件表面光整加工技术.金属材料的研磨抛光处理主要可分为机械和非机械型两类[1].在机械研磨抛光中,金刚石磨料以其超高的硬度及稳定性,适用于众多金属材料的研磨抛光处理,可使样品表面的粗糙度/光泽度达到相应的工业标准.而对于铝,镁和铜等......
disturbing effect during nanosized particle nucleation. This effect can prevent particles from enlarging and aggregation and make an absent oxygen circumstance during nanosized SnO2 nucleation... material; tin oxide; surface-interface effect 纳米材料所具有的"界面效应", "量子尺寸效应"和"宏观量子隧道效应"使其在结构, 光电, 磁学和化学性质等方面表现出特异性能[1-5]. 二氧化锡是一种宽带隙N型半导体(Eg≈3.50eV), 折射率约为2.0. 经掺杂的纳米二氧化锡具有特异的光电特性和气敏特性, 在许多领域有广泛的应......
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J. Cent. South Univ. (2017) 24: 1684-1695 DOI: 10.1007/s11771-017-3575-9 Perturbation effect of rock rheology under uniaxial compression GAO Yan-fa(高延法)1, HUANG Wan-peng(黄万朋)2, 3, QU Guang-long(曲广龙... state is defined as the rock rheological perturbation effect. This work presents a new experimental system for investigating the rock rheological perturbation effect with experiments on medium-hard red......
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Preparation of Rare Earth Doped Alumina-Siloxane Gel and Its ER Effect 井上真一1,李幼荣2,周兰香2,冈本宏1,邱关明3,张明2 (1.Department of Applied Chemistry, Aichi Institute of Technology, Toyota 470-0392, Japan... Mechanics, Changchun 130022, China) Abstract:Poly(methyl methacrylate) (PMMA) was used to wrap alumina-siloxane sol through emulsion polymerization. A kind of suspensions with notable ER effect......
最为广泛接受的观点就是体积效应(Volume effect),即超声振动的施加在塑性变形过程中对材料内部本构关系的影响.但已有"体积效应"的机理研究在该领域还不完善,定量理论还缺乏科学严谨的结论. 目前,对于"体积效应"的理论解释主要有两种.一种认为施加振动后材料的流动应力发生振荡,应力振荡导致材料平均流动应力下降,即应力叠加效应.KIRCHENER等[7]发现在塑性变形过程中施加振动后出现平均应...立一种应力叠加效应和声塑性效应混合的本构模型.各效应对于材料流动应力的影响如图1所示. 图1 超声振动"体积效应" Fig. 1 "Volume effect" of ultrasonic vibration(UV) 其中应力叠加模型可由金属材料弹塑性解释,并未造成材料塑性变形机制或材料参数的变化.先从非局部理论角度出发,考虑外部特征尺寸对材料内部微观结构的长程相互影响......
的变化规律并不相同；但是各自的表观活化能和指前因子随温度的变化规律相似,存在动力学补偿效应.通过对反应性指数,反应速率常数以及补偿线差异的分析,得出补偿线的高低可以成为判别不同钙基吸收剂分解快慢的一个依据.关键词:钙基吸收剂；煅烧；反应动力学；补偿效应Compensation effect in kinetics of Ca-based absorbents calcination... with the temperature according to different ways. However, there exists good kinetic compensation effect between their activation energy and pre-exponential factor. Through the analysis of the response index......
difference in the binding energy, the clusters at n=3 is more stable than others, and the magic numbers effect is also found. Key words: particle swarm optimization; Ni cluster; Sutton-Chen potential; magic numbers effect ......
