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| 1 | 锻造-增材复合制造Ti-6Al-4V合金结合区显微组织及力学性能显示文摘在Ti-6Al-4V合金锻造成形双态组织基材上采用激光立体成形方法(送粉式激光增材制造)沉积块体试样,研究了不同线能量密度输入下基材与增材结合区的微观组织特征及形成机制。结果表明,结合区内不同高度部位由于热源影响程度存在差异,形成了从下到上的非均匀组织。其中下部区域由于峰值温度较低,仍保持初始双态组织形貌,但发生一定粗化;中部区域随着温度升高以及保温时间延长,形成等轴α相、层片α相及大量次生α相的混合组织;而上方靠近增材区的峰值温度超过β相转变温度,完全转变为由层片α相形成的魏氏体组织,并伴随着由于元素扩散不充分而形成的阴影结构。对包含基材区和增材区的结合试样进行拉伸测试发现,在设定的能量密度范围内,断裂位置均远离结合区,表明增材区与基材区结合良好,结合区强度超过基材区及增材区强度。此外,对比不同能量密度复合制造Ti-6Al-4V试样的拉伸测试结果发现,线能量密度为100 J/mm时,结合区以及增材区α相特征尺寸较小,复合制造试样的屈服强度和抗拉强度最大。随线能量密度的增大,复合制造试样屈服强度和抗拉强度均减小,而延伸率增加。 | 马健凯 李俊杰 王志军 王俞鉴 王锦程 | 2021 | 金属学报2021，57，10： | 5 |
| 2 | Molecular kinetic theory of boundary slip on textured surfaces by molecular dynamics simulations显示文摘A theoretical model extended from the Frenkel-Eyring molecular kinetic theory(MKT)was applied to describe the boundary slip on textured surfaces.The concept of the equivalent depth of potential well was adopted to characterize the solid-liquid interactions on the textured surfaces.The slip behaviors on both chemically and topographically textured surfaces were investigated using molecular dynamics(MD)simulations.The extended MKT slip model is validated by our MD simulations under various situations,by constructing different complex surfaces and varying the surface wettability as well as the shear stress exerted on the liquid.This slip model can provide more comprehensive understanding of the liquid flow on atomic scale by considering the influence of the solid-liquid interactions and the applied shear stress on the nano-flow.Moreover,the slip velocity shear-rate dependence can be predicted using this slip model,since the nonlinear increase of the slip velocity under high shear stress can be approximated by a hyperbolic sine function. | WANG LiYa WANG FengChao YANG FuQian WU HengAn | 2014 | Science China(Physics,Mechanics & Astronomy)2014，57，11： | 4 |
| 3 | Preface to the Special Issue on Physical Mechanics显示文摘The 23rd International Congress of Theoretical and Applied Mechanics (ICTAM2012) will be held in Beijing, China, from August 19 to 24, 2012. The Congress (ICTAM), as the most authoritative and comprehensive conference in mechanics in | ZHAO YaPu Professor Guest Editor Institute of Mechanics,Chinese Academy of Sciences | 2012 | Science China(Physics,Mechanics & Astronomy)2012，55，6： | 3 |
| 4 | Au@TiO_2纳米管阵列的制备及光催化性能显示文摘利用一种简单易行、可控的方法制备了均匀的Au@TiO_2纳米管阵列。首先在室温下通过阳极氧化的方法形成TiO_2纳米管,再在氧化后的TiO_2纳米管上用磁控溅射沉积不同厚度的Au膜,最后将沉积Au膜后的TiO_2纳米管在空气中450℃退火2h。热处理过程导致了Au向TiO_2纳米管的扩散,在纳米管表面形成了Au'岛'包裹的Au@TiO_2纳米管。对制备的Au@TiO_2纳米管的微观结构利用了扫描电子显微镜、能谱、X射线衍射和透射电子显微镜进行表征。并且用光电流、紫外可见光光漫反射光谱、荧光光谱和降解亚甲基蓝溶液的方法分析测量了Au@TiO_2纳米管的光电性能及光催化性能。结果表明:当可见光照射含Au@TiO_2纳米管催化剂的亚甲基蓝水溶液时,其光催化性能远远高于纯TiO_2纳米管,这是由于Au颗粒表面等离子体共振效应(LSPR)增加了电子-空穴对的分离并且延缓了其重组所致。 | 周琱玉 李涛涛 王辉 乔珺威 梁伟 | 2019 | 化工进展2019，38，3： | 2 |
| 5 | 硅基薄膜电极充放电过程应力演化解析解研究显示文摘为了研究硅电极在充放电过程中的应力演化,在忽略弹性变形的情况下提出了一个考虑粘塑性的简化力学模型,分别导出了出现相分离和不出现相分离时薄膜电极内应力场的解析解,该模型的计算结果与现有的实验结果相吻合.计算结果表明,当存在相分离时,电极中的应力取决于薄膜电极的厚度和充电速率的乘积;在未出现相分离现象时,应力仅取决于充电速率.这个解析形式的力学模型对于锂离子电池电极材料的设计有着重要的指导意义. | 管箫 张锴 郑百林 | 2021 | 力学季刊2021，42，2： | 0 |
| 6 | A simple model for diffusion-induced dislocations during the lithiation of crystalline materials显示文摘Assuming that the lithiation reaction occurs randomly in individual small particles in the vicinity of the reaction front, a simple model of diffusioninduced dislocations was developed. The diffusion-induced dislocations are controlled by the misfit strain created by the diffusion of solute atoms or the phase transformation in the vicinity of the reaction front. The dislocation density is proportional to the total surface area of the 'lithiated particle' and inversely proportional to the particle volume. The diffusion-induced dislocations relieve the diffusion-induced stresses. | Fuqian Yang | 2014 | Theoretical & Applied Mechanics Letters2014，4，5： | 0 |
| 7 | Entropy change-induced elastic softening of lithiated materials显示文摘To understand the ‘‘elastic softening'' of Li–Si alloys for the development of Li-ion batteries, the effect of stress-induced change of entropy on the mechanical properties of lithiated materials is examined within the theories of thermodynamics and linear elasticity. An approach is presented whereby the change of Gibbs free energy is governed by the change of the mixture entropy due to stress-induced migration of mobile atoms, from which the contribution of the change of the mixture entropy to the apparent elastic modulus of lithiated materials is determined. The reciprocal of the apparent elastic modulus of a lithiated material is a linear function of the concentration of mobile Li-atoms at a stress-free state and the square of the mismatch strain per unit mole fraction of mobile Li-atoms. | Fuqian Yang | 2015 | Theoretical & Applied Mechanics Letters2015，5，6： | 0 |
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