Electron Crystallography最新文献

Study on Dislocation-Dopant Ions Interaction during Plastic Deformation by Combination Method of Strain-Rate Cycling Tests and Application of Ultrasonic Oscillations 应变速率循环试验与超声振荡相结合的塑性变形中位错-掺杂离子相互作用研究

Electron Crystallography Pub Date : 2020-05-20 DOI: 10.5772/intechopen.92607

Y. Kohzuki

引用次数: 1

Transmission Electron Microscopy of Nanomaterials 纳米材料的透射电子显微镜

Electron Crystallography Pub Date : 2020-05-08 DOI: 10.5772/intechopen.92212

Mohammad Jafari Eskandari, Reza Gostariani, M. A. Asadabad

引用次数: 11

Micro-/Nano-Structuring in Stainless Steels by Metal Forming and Materials Processing 金属成形与材料加工在不锈钢中的微/纳米结构

Electron Crystallography Pub Date : 2020-03-11 DOI: 10.5772/intechopen.91281

T. Aizawa, T. Shiratori, T. Komatsu

{"title":"Micro-/Nano-Structuring in Stainless Steels by Metal Forming and Materials Processing","authors":"T. Aizawa, T. Shiratori, T. Komatsu","doi":"10.5772/intechopen.91281","DOIUrl":"https://doi.org/10.5772/intechopen.91281","url":null,"abstract":"Austenitic stainless steel type AISI304 sheets and plates as well as finegrained type AISI316 (FGSS316) substrates and wires were employed as a work material in the intense rolling, the piercing and the plasma nitriding. AISI304 sheet after intense rolling had textured microstructure in the rolling direction. Crystallographic state changed itself to have distorted polycrystalline state along the shearing plane by piercing, with the strain induced phase transformation. FGSS316 substrates were plasma nitrided at 623 K for 14.4 ks to have two-phase fine nanostructure with the average grain size of 100 nm as a surface layer with the thickness of 30 μm. FGSS316 wires were also plasma nitrided at the same conditions to form the nitrided surface down to the depth of 30 μm. This nitrided wire was further uniaxially loaded in tensile to attain more homogeneously nitrided surface nano-structure and to form the austenitic and martensitic fiber structure aligned in the tensile direction. Each crystallographic structure intrinsic to metals and metallic alloys was tailored to have preferable micro−/nano-structured cells by metal forming and nitrogen supersaturation. The crystallographic change by metal forming in a priori and posterior to nitriding was discussed to find out a new way for materials design.","PeriodicalId":378601,"journal":{"name":"Electron Crystallography","volume":"444 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115867613","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: 7

Structure Analysis of Quasicrystal Approximants by Rotation Electron Diffraction (RED) 准晶近似物的旋转电子衍射(RED)结构分析

Electron Crystallography Pub Date : 2020-03-03 DOI: 10.5772/intechopen.91372

Devinder Singh, S. Hovmöller

{"title":"Structure Analysis of Quasicrystal Approximants by Rotation Electron Diffraction (RED)","authors":"Devinder Singh, S. Hovmöller","doi":"10.5772/intechopen.91372","DOIUrl":"https://doi.org/10.5772/intechopen.91372","url":null,"abstract":"Complete 3D electron diffraction can be collected by rotation electron diffraction (RED) for single-crystal powder-sized samples, i.e., <0.1 μ m, in all dimensions. Data collection takes about 1 h and data processing takes another hour. The crystal structures are solved by standard crystallographic techniques. X-ray crystallography requires crystals several micrometers big. For nanometer-sized crystals, electron diffraction and electron microscopy (EM) are the only possibilities. Two methods have been developed for collecting complete (except for a missing cone) three-dimensional (3D) electron diffraction data: the rotation electron diffraction and automated electron diffraction tomography (ADT). By collecting 1000–2000 electron diffraction patterns, a complete 3D data set is obtained. The geometry in RED is analogous to the rotation method in X-ray crystallography; the sample is rotated continuously along one rotation axis. In recent years, large number of crystal structures has been solved by RED. These include the most complex zeolites ever solved and quasicrystal approximants, such as the pseudo-decagonal approximants PD2 and PD1 in Al-Co-Ni. In this chapter, the results of our recent studies on the structure analysis of complex pseudo-decagonal (PD) quasicrystal approximants PD2 ( a = 23.2, b = 32.3, c = 4.1 Å) and PD1 ( a = 37.3, b = 38.8, c = 4.1 Å) by RED have been discussed. These are known to be the most complicated approximant structures ever solved to atomic resolution by electron crystallography. PD2 and PD1 are built of characteristic 2 nm wheel clusters with fivefold rotational symmetry, which agrees with other approximants in the PD series as well as with the results from high-resolution electron microscopy images.","PeriodicalId":378601,"journal":{"name":"Electron Crystallography","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129482331","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: 0

Empires: The Nonlocal Properties of Quasicrystals 帝国:准晶体的非局域性质

Electron Crystallography Pub Date : 2019-11-26 DOI: 10.5772/INTECHOPEN.90237

F. Fang, S. Paduroiu, Dugan Hammock, K. Irwin

引用次数: 1