Observations on the precipitates in steels by extraction replica technique using the potentiostatic etching method with a non-aqueous electrolyte

1992 ◽  
Vol 50 (1) ◽  
pp. 398-399
Author(s):  
Shin-hwa Park ◽  
Ki-hwan Kim ◽  
Byung-ryang An
Keyword(s):  
Mechanical Properties ◽  
Electron Microscope ◽  
Quantitative Analysis ◽  
Precipitation Hardening ◽  
Aqueous Electrolyte ◽  
Replica Technique ◽  
Extraction Replica ◽  
Etching Method ◽  
Scanning Electron

Quantitative analysis of the precipitates of the steel is necessary in order to improve mechanical properties of the steel, because the precipitates in steels play an important role on the grain growth, recrystallization, and precipitation hardening. Recently, in-situ scanning electron microscope(SEM) observations on the precipitates with potentiostatic etching method in non-aqueous electrolyte have been reported. We applied the potentiostatic etching method for the preparation of the extraction replica.

In Situ Composites: Effect of Intermolecular Hydrogen Bonds on Polyamide 66/TLCP Blends

2007 ◽  
Vol 546-549 ◽  
pp. 1515-1520
Author(s):  
Zhuo Zhang ◽  
Hong Jun Guo ◽  
Wei He ◽  
Wen Xion Zhang
Keyword(s):  
Mechanical Properties ◽  
Fourier Transform ◽  
Electron Microscope ◽  
Liquid Crystalline ◽  
Polyamide 66 ◽  
Intermolecular Hydrogen Bonds ◽  
In Situ Composites ◽  
Infra Red ◽  
Scanning Electron

The thermotropic liquid crystalline copolyamide (TLCPa) was synthesized and the in situ composites for TLCPa/Polyamides 66 (PA66) were prepared by melting extrusion. As revealed by differential scanning calorimeter (DSC), depression of the melting point and the crystallinity of PA66 indicated that the miscibility was enhanced via intermolecular H-bonds. Characteristic absorption shifts of C=O groups of TLCPa/PA66 in Fourier transform infra-red spectra (FTIR) confirmed the existence of H-bonds. Scanning electron microscope (SEM) observation showed that the shape of TLCPa phase change in matrix with increasing TLCPa content. Mechanical properties of blends were significantly improved by good interface adhesion and TLCPa fibrils generation.

Effect of Sidewall Fluorination on the Mechanical Properties of Catalytically Grown Multi-Wall Carbon Nanotubes

2011 ◽  
Vol 1284 ◽  
Author(s):  
Yogeeswaran Ganesan ◽  
Cheng Peng ◽  
Lijie Ci ◽  
Valery Khabashesku ◽  
Pulickel M. Ajayan ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Tensile Strength ◽  
Electron Microscope ◽  
Tensile Testing ◽  
Load Bearing Capacity ◽  
Multi Wall Carbon Nanotubes ◽  
Pristine Mwnts ◽  
Scanning Electron

ABSTRACTWe report on the usage of a simple microfabricateddevice, that works in conjunction with a quantitative nanoindenter inside a scanning electron microscope (SEM), for the in situ quantitative tensile testing of individual sidewall fluorinated multi-wall carbon nanotubes (MWNTs). The stress vs. strain curves and the tensile strength values for five fluorinated specimens have been presented and compared to those of pristine MWNT specimens (data reported earlier). The fluorinated specimens were found to deform and fail in a brittle fashion similar to pristine MWNTs. However, sidewall fluorination was found to have considerably degraded the mechanical properties (tensile strength and load bearing capacity) of the MWNTs.

Temperature Dependence of Dominant Hillock Phases during Electromigration of Eutectic SnPb Solder Lines

2007 ◽  
Vol 124-126 ◽  
pp. 9-12
Author(s):  
Min Seung Yoon ◽  
Oh Han Kim ◽  
Young Chang Joo ◽  
Young Bae Park
Keyword(s):  
Electron Microscope ◽  
Quantitative Analysis ◽  
Temperature Dependence ◽  
Depletion Region ◽  
In Situ Observation ◽  
Atomic Size ◽  
Snpb Solder ◽  
Eutectic Snpb ◽  
Scanning Electron

In-situ observation by scanning electron microscope of the microstructure evolution near the cathode depletion region and the quantitative analysis on the number of hillock phases in the eutectic SnPb edge drift structure made it clear that the dominant migrating element and dominant hillock phase were Sn and Pb, respectively, under 50 oC while both dominant migrating element and dominant hillock phase were Pb above 100 oC. Such temperature-dependence of the dominant hillock phases in the eutectic SnPb solder can be understood by considering the atomic size factors of the metallic solid solutions.

Scale effect investigation of copper microwire's mechanical properties after in situ scanning electron microscope twisting

2018 ◽  
Vol 233 (10) ◽  
pp. 3670-3677
Author(s):  
Fengmei Xue ◽  
Haojian Lu ◽  
Yajing Shen
Keyword(s):  
Mechanical Properties ◽  
Electron Microscope ◽  
Elastic Modulus ◽  
Scanning Electron Microscope ◽  
Strain Hardening Exponent ◽  
Surface Cracks ◽  
Manipulation System ◽  
Fracture Features ◽  
Scanning Electron

In this study, the mechanical property of copper microwire, a widely used material in our daily life, is investigated by subjecting it to in situ scanning electron microscope twisting based on a self-developed nanorobotic manipulation system. First, copper microwire is assembled on the nanorobotic system inside the scanning electron microscope, and then twisted clockwise and anticlockwise continuously from 0° to 360° until fracture. After that, the mechanical properties of elastic modulus, microhardness, yield stress, and the strain hardening exponent of the twisted sample are investigated by nanoindentation. The change in elastic modulus and indention hardness showed strong indentation size effects, because a large number of geometrically necessary dislocations were generated around the indenter. In addition, the fracture analysis indicated that the smaller the scale of the material, the more sensitive it was to surface cracks or defects. Ductile fracture features of the twisted sample appear due to the nucleation, growth, and coalescence of the microvoids.

scholarly journals Unveiling the thickness-dependent mechanical properties of graphene papers by in situ SEM tension

RSC Advances ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 4609-4615
Author(s):  
Tianci Cao ◽  
Xianqiang Liu ◽  
Xiaopeng Cheng ◽  
Yonghe Li ◽  
Lijun Sang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Fracture Strength ◽  
Tensile Tests ◽  
Graphene Sheets ◽  
Graphene Paper ◽  
Different Thickness ◽  
Scanning Electron

We prepared graphene paper (GP) using graphene sheets of different thickness. The fracture strength of the GP was assessed by uniaxial in-plane tensile tests using an in situ scanning electron microscope.

Effect of the Neodymium Content on Mechanical Properties of the Electro-Brush Plated Nano-Al2O3/Ni Composite Coating

2012 ◽  
Vol 525-526 ◽  
pp. 277-280
Author(s):  
Guo Jin ◽  
Xiu Fang Cui ◽  
Er Bao Liu ◽  
Qing Fen Li
Keyword(s):  
Mechanical Properties ◽  
Rare Earth ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Composite Coating ◽  
Nanoindentation Test ◽  
X Ray Diffraction ◽  
X Ray ◽  
Small Cracks ◽  
Scanning Electron

The effect of the neodymium content on mechanical properties of the electro-brush plated nanoAl2O3/Ni composite coating was investigated in this paper. The microstructure and phase structure were studied with scanning electron microscope (SEM) and X-ray diffraction (XRD). The hardness and abrasion properties of several coatings with different neodymium content were studied by nanoindentation test and friction / wear experiment. Results show that the coatings are much finer and more compact when the neodymium was added, and the hardness and abrasion property of the coatings with neodymium were improved obviously. Besides, the small cracks conduced by the upgrowth stress in the coatings were ameliorated when the rare earth neodymium was added. The improvement mechanism was further discussed.

Effect of Briquetting Pressure on the Performance of In Situ Formed Sialon in Al2O3-C Refractory Bricks

2014 ◽  
Vol 881-883 ◽  
pp. 1049-1052 ◽  
Author(s):  
Nai Peng ◽  
Cheng Ji Deng ◽  
Hong Xi Zhu
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
X Ray Diffraction ◽  
X Ray ◽  
Z Value ◽  
Refractory Bricks ◽  
Scanning Electron

In this paper, the effects of briquetting pressure on the performance of in-situ formed Sialon in Al2O3-C refractory bricks are investigated. The phase compositions and microstructure of the Al2O3-C refractory were investigated by X-ray diffraction (XRD) and scanning electron microscope (SEM).The results show the briquetting pressure hardly has effect on the phase of the sintered specimens, two new phases of Sialon with a Z value of 2 and SiC formed. The micrographs of Sialon crystals have the shape of both column and tabular column, but with a cone tip in the specimens sintered at 200MPa and 300MPa and smooth tip in specimens sintered at 400MPa and 500MPa.

Sign in / Sign up

Export Citation Format

Share Document