Philosophical Magazine A最新文献_第7页

On the origin of fivefold multiply twinned nanoparticles in chemically vapour-deposited hexagonal boron nitride 化学气相沉积六方氮化硼中五重孪晶纳米颗粒的起源

Philosophical Magazine A Pub Date : 2002-09-01 DOI: 10.1080/01418610208240059

B. Reznik, K. Eichhorn, D. Gerthsen

引用次数: 3

Surface instability and delamination of epitaxially stressed bilayers 外延应力双层结构的表面不稳定性和分层

Philosophical Magazine A Pub Date : 2002-09-01 DOI: 10.1080/01418610208240055

I. Colin, J. Grilhé

引用次数: 4

Transmission electron microscopy analysis of planar faults on (001) planes in MoSi2 single crystals MoSi2单晶(001)面缺陷的透射电镜分析

Philosophical Magazine A Pub Date : 2002-09-01 DOI: 10.1080/01418610208240063

S. Guder, M. Bartsch, U. Messerschmidt

引用次数: 7

Modification of crystal structures in perovskite-type niobate nanosheets 钙钛矿型铌酸盐纳米片晶体结构的改性

Philosophical Magazine A Pub Date : 2002-09-01 DOI: 10.1080/01418610208240058

F. Xu, Y. Bando, Y. Ebina, T. Sasaki

引用次数: 10

Equivalent continuum for dynamically deforming atomistic particle systems 动态变形原子粒子系统的等效连续统

Philosophical Magazine A Pub Date : 2002-09-01 DOI: 10.1080/01418610208240052

Min Zhou, D. McDowell

{"title":"Equivalent continuum for dynamically deforming atomistic particle systems","authors":"Min Zhou, D. McDowell","doi":"10.1080/01418610208240052","DOIUrl":"https://doi.org/10.1080/01418610208240052","url":null,"abstract":"Abstract An equivalent continuum is defined for dynamically deforming atomistic particle systems treated with concepts of molecular dynamics. The discrete particle systems considered exhibit micropolar interatomic interactions which involve both central interatomic forces and interatomic moments. The equivalence of the continuum to discrete atomic systems includes, firstly, preservation of linear and angular momenta, secondly, conservation of internal, external and inertial work rates and, thirdly, conservation of mass. This equivalence is achieved through the definition of, firstly, continuum stress and couple stress fields that make the same contribution to motion and deformation as internal interatomic forces and couples, secondly, continuum fields of body force, body moment, surface traction and surface moment that make the same contribution to motion and deformation as external forces and moments on the atoms, thirdly, a continuum deformation field that is work conjugate to the continuum kinetic fields and consistent with the atomic deformation field and, fourthly, continuum distributions of mass and moment of inertia that preserve the linear and angular momenta as well as kinetic energy. This equivalence holds for the entire system and for volume elements defined by any subset of particles in the system; therefore, averaging and characterization across different length scales are possible and size-scale effects can be explicitly analysed. The framework of analysis provides an explicit account of arbitrary atom arrangement, admitting applications to both crystalline and amorphous structures. The analysis also applies to both homogeneous materials with identical atoms and heterogeneous materials with dissimilar atoms. For non-polar atomic systems with only central interatomic forces, the fields of couple stress, body moment and surface moment vanish. This demonstrates that, on the interatomic level, interatomic moments give rise to couple stresses of dynamically equivalent nature.","PeriodicalId":114492,"journal":{"name":"Philosophical Magazine A","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122703705","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 64

Interaction of glissile dislocations with perfect and truncated stacking-fault tetrahedra in irradiated metals 辐照金属中滑动位错与完全和截断层错四面体的相互作用

Philosophical Magazine A Pub Date : 2002-09-01 DOI: 10.1080/01418610208240062

M. Hiratani, H. Zbib, B. Wirth

{"title":"Interaction of glissile dislocations with perfect and truncated stacking-fault tetrahedra in irradiated metals","authors":"M. Hiratani, H. Zbib, B. Wirth","doi":"10.1080/01418610208240062","DOIUrl":"https://doi.org/10.1080/01418610208240062","url":null,"abstract":"Abstract Mechanisms for the collapse and absorption of truncated stacking-fault tetrahedra (SFTs) by approaching dislocations are proposed. Both self-energy and elastic interaction energy in a straight dislocation-SFT system are calculated analytically. Although an isolated perfect or truncated SFT is in many cases more stable than a perfect dislocation loop or Frank sessile loop, it can become metastable under the influence of strain fields of surrounding dislocations. Interaction between incident dislocations and SFTs can cause instability of the perfect SFT relative to a truncated SFT, Frank sessile loop and perfect dislocation loop. In general, the interaction between a single SFT and a single dislocation is found to be not large enough for thermal activations to overcome the elastic barriers between a metastable truncated SFT and a stable unfaulted loop. Pinning through core reactions and dislocation pile-ups in certain glide systems approaching the SFT are shown to lower the activation barriers considerably. These collapse and absorption mechanisms can explain the production of defect-free channels in irradiated materials.","PeriodicalId":114492,"journal":{"name":"Philosophical Magazine A","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121459220","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 40

Rate dependence of deformation mechanisms in a shape memory alloy 形状记忆合金变形机制的速率依赖性

Philosophical Magazine A Pub Date : 2002-08-01 DOI: 10.1080/01418610208240046

Y. Liu, Yulong Li, K. Ramesh

引用次数: 42

Computer simulation on the tendency of intergranular fracture in textured polycrystalline materials 织构多晶材料晶间断裂趋势的计算机模拟

Philosophical Magazine A Pub Date : 2002-08-01 DOI: 10.1080/01418610208240049

G. Wang, L. Zuo, C. Esling

引用次数: 17

Trends of combinations of elastic constants of covalent semiconductors with mean interelectronic separation 共价半导体弹性常数与平均电子间分离的组合趋势

Philosophical Magazine A Pub Date : 2002-08-01 DOI: 10.1080/01418610208240047

N. H. March, V. V. van Doren, C. Matthai