scholarly journals Наноиндентирование и механические свойства материалов в субмикро- и наношкале. Недавние результаты и достижения (О б з о р)

2021 ◽  
Vol 63 (1) ◽  
pp. 3
Author(s):  
Ю.И. Головин
Keyword(s):  
In Situ Monitoring ◽  
Load Testing ◽  
Crystalline Materials ◽  
Nanomechanical Properties ◽  
Nano Crystalline ◽  
Transmission Electron ◽  
Low Load ◽  
Rfbr Grant ◽  
Wide Family

The review discusses the details of various materials mechanical behavior in submicro- and nanoscale. Significant advances in this scope result from the development of wide family of load based precise nanotesting techniques called nanoindentation. But nowadays, nanomechanical properties are studied not only by nanoindentation techniques in narrow sense, i.e. local loading of macro, micro and nanoscale objects. Nanomechanical load testing is discussed here within a wider scope employing precise deformation measurement with nanometer scale resolution caused by various types of low load application to the object under study including uniaxial compression or extension, shearing, bending or twisting, optionally accompanied by in situ monitoring sample microstructure using scanning and transmission electron microscopy and Laue microdiffraction technique. The main courses of experimental techniques development in recent ten years along with the results obtained using them in single, poly and nano crystalline materials, composites, films and coatings, amorphous solids and such biomaterials as tissues, living cells and macromolecules are described. Special attention is paid to deformation size effects and atomic mechanisms in nanoscale. This review is a natural continuation and development of the review published at Fiz.Tverd.Tela vol.50, issue 12, 2008 of the same author that discusses details of nanomechanical properties of solids. Current review includes wider range of nanomechanical testing concepts and recent achievements in the scope. The work was supported by RFBR grant for project #19-12-50235.

In Situ Monitoring of the Seeding and Growth of Silver Metal–Organic Nanotubes by Liquid-Cell Transmission Electron Microscopy

ACS Nano ◽  
2020 ◽  
Vol 14 (7) ◽  
pp. 8735-8743 ◽  
Author(s):  
Karthikeyan Gnanasekaran ◽  
Kristina M. Vailonis ◽  
David M. Jenkins ◽  
Nathan C. Gianneschi
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
In Situ Monitoring ◽  
Transmission Electron ◽  
Cell Transmission ◽  
Metal Organic ◽  
Liquid Cell ◽  
Organic Nanotubes ◽  
Silver Metal

Size effect on nanomechanical properties of ZnO cones using in situ transmission electron microscopy

2013 ◽  
Vol 13 (8) ◽  
pp. 1689-1696 ◽  
Author(s):  
Shao-Hui Kang ◽  
Te-Hua Fang ◽  
Tao-Hsing Chen ◽  
Ching-Hong Kuo
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Size Effect ◽  
Nanomechanical Properties ◽  
Transmission Electron

Dynamic Atomic Mechanisms of Plasticity of Ni Nanowires and Nano Crystalline Ultra-Thin Films

2010 ◽  
Vol 654-656 ◽  
pp. 2293-2296 ◽  
Author(s):  
Xiao Dong Han ◽  
Li Hua Wang ◽  
Pan Liu ◽  
Yong Hai Yue ◽  
Ming Jie Yang ◽  
...  
Keyword(s):  
Thin Films ◽  
Large Strain ◽  
Atomic Scale ◽  
Nano Crystalline ◽  
Transmission Electron ◽  
Strain Plasticity ◽  
Large Strain Plasticity ◽  
Microscopy Techniques ◽  
Mechanisms Of Plasticity

Using our recently developed in situ transmission electron microscopy techniques, we revealed that the FCC structured Ni nanowires with diameter of about 30 nm possess ultra-large strain plasticity. Dynamic complex dislocation activities mediated the large strain bent-plasticity and they were monitored at atomic scale in real time. The bent-induced strain gradient allows studying the strain effects on dislocation mediated plasticity. We also explored the deformation techniques to more general cases, the nano thin films. An example of tensile Pt ultra-thin film is presented.

Exploration of the two-step crystallization of organic micro/nano crystalline materials by fluorescence spectroscopy

2018 ◽  
Vol 2 (7) ◽  
pp. 1323-1327 ◽  
Author(s):  
Peng-Zhong Chen ◽  
Li-Ya Niu ◽  
Han Zhang ◽  
Yu-Zhe Chen ◽  
Qing-Zheng Yang
Keyword(s):  
Phase Transition ◽  
Fluorescence Spectroscopy ◽  
Real Time ◽  
Crystalline Materials ◽  
Nano Crystalline ◽  
Step Crystallization

A phase transition from amorphous nanospheres to crystalline nanorods was achieved and monitored in situ and in real-time by fluorescence spectroscopy.

Nano-Crystalline Structure in Mg2Si/Mg-2.5Er-5Zn Composite on the Route of Repeated Plastic Working Process

2010 ◽  
Vol 667-669 ◽  
pp. 635-639
Author(s):  
Wen Bo Du ◽  
Xu Dong Wang ◽  
Zhao Hui Wang ◽  
Shu Bo Li
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Second Phase ◽  
Plastic Working ◽  
Nano Crystalline ◽  
Transmission Electron ◽  
The Matrix ◽  
Nonequilibrium Grain Boundaries ◽  
The Difference

The Mg-5Zn-2.5Er matrix composite reinforced with the in-situ synthesized Mg2Si second phase particles was fabricated via repeated plastic working (RPW) process. The microstructures and the nanocrystals in the composite have been investigated using transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HREM) and energy dispersive X-ray (EDX). Great deals of nanocrystals were found in the matrix, and they were around the in-situ synthesized Mg2Si. The HREM analysis showed that the size of nanocrystals was in the range of 5-10 nm, and the difference in their crystallographic orientation was bigger than 15°. It is suggested that the formation of nanocrystals in the matrix is attributed to the RPW deformation process and to the intensive stresse fields around the in-situ synthesized Mg2Si particles, which suppress the growth of nanocrystals by forming nonequilibrium grain boundaries containing disordered dislocation networks and junction disclinations.

scholarly journals Application of In Situ Liquid Cell Transmission Electron Microscopy in Corrosion Studies: A Critical Review of Challenges and Achievements

CORROSION ◽  
10.5006/3369 ◽  
2019 ◽  
Vol 76 (1) ◽  
pp. 4-17 ◽  
Author(s):  
Ali Kosari ◽  
Henny Zandbergen ◽  
Frans Tichelaar ◽  
Peter Visser ◽  
Herman Terryn ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Real Life ◽  
In Situ Monitoring ◽  
Ex Situ ◽  
Transmission Electron ◽  
Corrosion Studies ◽  
Cell Transmission ◽  
Liquid Cell

Identifying corrosion initiation events in metals and alloys demands techniques that can provide temporal and spatial resolution simultaneously. Transmission electron microscopy (TEM) enables one to obtain microstructural and chemical descriptors of materials at atomic/nanoscopic level and has been used in corrosion studies of many metal-electrolyte combinations. Conventionally, ex situ and quasi in situ TEM studies of pre- and post-corroded samples were performed, but possible experimental artifacts such as dehydrated surfaces might not fully represent the real interfacial conditions as compared to those when actually immersed in the electrolyte. Recent advances in liquid cell transmission electron microscopy (LC-TEM) allows for in situ monitoring morphological and even compositional evolutions in materials resulting from interaction with gas or liquid environments. Corrosion science, as a challenging field of research, can benefit from this unparalleled opportunity to investigate many complicated corroding systems in aqueous environments at high resolution. However, “real life” corrosion with LC-TEM is still not straightforward in implementation and there are limitations and challenging experimental considerations for conducting reliable examinations. Thus, this study has been devoted to discussing the challenges of in situ LC-TEM wherein state-of-the-art achievements in the field of relevance are reviewed.

Sign in / Sign up

Export Citation Format

Share Document