The Determination of Evolving Microstructure Using Constitutive Relationships

1999 ◽  
Vol 578 ◽  
Author(s):  
B.J. Diak ◽  
S. Saimoto
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Grain Size ◽  
Tensile Deformation ◽  
Constitutive Parameter ◽  
Upper Limit ◽  
Transmission Electron ◽  
The Mean ◽  
Slip Distance

AbstractThe evolution of the constitutive parameter, the mean slip distance, λ, is monitored during tensile deformation of 3.2 μm grain size aluminum at 200 K. Transmission electron microscopy (TEM) confirms that the grain size, D, sets an upper limit to λ.

Effect on corrosion resistance of microstructure of 316L austenitic stainless steel subjected to combined torsion–tension deformation

2020 ◽  
Vol 111 (5) ◽  
pp. 405-415
Author(s):  
Jidong Zhang ◽  
Weixue Han ◽  
Wenliang Rui ◽  
Jinghui Li ◽  
Zhenyi Huang ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Grain Size ◽  
Stainless Steel ◽  
Corrosion Resistance ◽  
316L Stainless Steel ◽  
Tensile Deformation ◽  
Deformation Twins ◽  
Transmission Electron ◽  
316L Austenitic Stainless Steel

Abstract The influences of combined torsion-tension deformation on the microstructural evolution and corrosion resistance of 316L stainless steel were investigated. The microstructure and corrosion behavior of the deformation samples were studied in detail. The results showed that the grains were more significantly refined under combined deformation than under tensile deformation. However, further increase in pre-torsion led to little change in grain size. The results of transmission electron microscopy and corrosion tests results indicated that high-density dislocations were detrimental, whereas the corrosion resistance, grain refinement and deformation twins were beneficial to corrosion resistance. Furthermore, the effect of deformation twins on corrosion resistance was greater than that of dislocation density, which, in turn, was greater than the influence of grain size.

Melting process of nanometer-sized In particles embedded in an Al matrix synthesized by ball milling

1996 ◽  
Vol 11 (11) ◽  
pp. 2841-2851 ◽  
Author(s):  
H. W. Sheng ◽  
J. Xu ◽  
L. G. Yu ◽  
X. K. Sun ◽  
Z. Q. Hu ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Grain Size ◽  
Melting Point ◽  
Melting Point Depression ◽  
X Ray ◽  
Transmission Electron ◽  
Mean Grain Size ◽  
The Mean ◽  
Al Matrix

Dispersions of nanometer-sized In particles embedded in an Al matrix (10 wt. % In) have been synthesized by ball milling of a mixture of Al and In powders. The as-milled product was characterized by using x-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive x-ray spectrometer (EDX), transmission electron microscopy (TEM), and high resolution transmission electron microscopy (HREM), respectively. It was found that In and Al are pure components immiscible with each other, with nanometer-sized In particles dispersively embedded in the Al matrix. The melting behavior of In particles was investigated by means of differential scanning calorimeter (DSC). The calorimetric measurements indicate that both the melting point and the melting enthalpy of the In nanoparticles decrease with increasing milling time, or refinement of the In particles. Compared to its bulk melting temperature, a melting point depression of 13.4 K was observed when the mean grain size of In is 15 nm, and the melting point depression of In nanoparticles is proportional to the reciprocal of the mean grain size. The melting enthalpy depression was interpreted according to the two-state concept for the nanoparticles. Melting of the interface was deduced to be an exothermal process due to its large excess energy/volume.

scholarly journals The Domain and Microstructure of Resin-Bonded Magnets

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2849
Author(s):  
Marcin Jan Dośpiał
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Grain Size ◽  
Size Distribution ◽  
Domain Structure ◽  
Grain Size Distribution ◽  
Exchange Interactions ◽  
Force Microscopy ◽  
Transmission Electron ◽  
Scanning Electron

This paper presents domain and structure studies of bonded magnets made from nanocrystalline Nd-(Fe, Co)-B powder. The structure studies were investigated using scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), Mössbauer spectroscopy and X-ray diffractometry. On the basis of performed qualitative and quantitative phase composition studies, it was found that investigated alloy was mainly composed of Nd2(Fe-Co)14B hard magnetic phase (98 vol%) and a small amount of Nd1.1Fe4B4 paramagnetic phase (2 vol%). The best fit of grain size distribution was achieved for the lognormal function. The mean grain size determined from transmission electron microscopy (TEM) images on the basis of grain size distribution and diffraction pattern using the Bragg equation was about ≈130 nm. HRTEM images showed that over-stoichiometric Nd was mainly distributed on the grain boundaries as a thin amorphous border of 2 nm in width. The domain structure was investigated using a scanning electron microscope and metallographic light microscope, respectively, by Bitter and Kerr methods, and by magnetic force microscopy. Domain structure studies revealed that the observed domain structure had a labyrinth shape, which is typically observed in magnets, where strong exchange interactions between grains are present. The analysis of the domain structure in different states of magnetization revealed the dynamics of the reversal magnetization process.

scholarly journals Determination of the 3-D Magnetic Vector Potential using Lorentz Transmission Electron Microscopy

2009 ◽  
Vol 15 (S2) ◽  
pp. 134-135 ◽  
Author(s):  
C Phatak ◽  
E Humphrey ◽  
M DeGraef ◽  
A Petford-Long
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Vector Potential ◽  
Magnetic Vector Potential ◽  
Magnetic Vector ◽  
Transmission Electron ◽  
Lorentz Transmission Electron Microscopy

Extended abstract of a paper presented at Microscopy and Microanalysis 2009 in Richmond, Virginia, USA, July 26 – July 30, 2009

Sign in / Sign up

Export Citation Format

Share Document