In situ high temperature creep deformation of micro-structure with metal film wire on flexible membrane using geometric phase analysis

2013 ◽  
Vol 53 (4) ◽  
pp. 652-657 ◽  
Author(s):  
Qinghua Wang ◽  
Satoshi Kishimoto ◽  
Huimin Xie ◽  
Zhanwei Liu ◽  
Xinhao Lou
Keyword(s):  
High Temperature ◽  
Phase Analysis ◽  
Creep Deformation ◽  
Geometric Phase ◽  
Metal Film ◽  
High Temperature Creep ◽  
Micro Structure ◽  
Flexible Membrane ◽  
Geometric Phase Analysis

Local Lattice Strain Measurement Using Geometric Phase Analysis of Dark Field Images from Scanning Transmission Electron Microscopy

2011 ◽  
Author(s):  
Jayhoon Chung ◽  
Guoda Lian ◽  
Lew Rabenberg
Keyword(s):  
Phase Analysis ◽  
Geometric Phase ◽  
Process Development ◽  
Local Strain ◽  
Strain Engineering ◽  
Dark Field ◽  
Scanning Transmission Electron ◽  
Transmission Electron ◽  
Geometric Phase Analysis ◽  
Scanning Transmission

Abstract Since strain engineering plays a key role in semiconductor technology development, a reliable and reproducible technique to measure local strain in devices is necessary for process development and failure analysis. In this paper, geometric phase analysis of high angle annular dark field - scanning transmission electron microscope images is presented as an effective technique to measure local strains in the current node of Si based transistors.

Dislocation core investigation by geometric phase analysis and the dislocation density tensor

2008 ◽  
Vol 41 (3) ◽  
pp. 035408 ◽  
Author(s):  
J Kioseoglou ◽  
G P Dimitrakopulos ◽  
Ph Komninou ◽  
Th Karakostas ◽  
E C Aifantis
Keyword(s):  
Dislocation Density ◽  
Phase Analysis ◽  
Geometric Phase ◽  
Dislocation Core ◽  
Density Tensor ◽  
Geometric Phase Analysis ◽  
Dislocation Density Tensor

scholarly journals Effect of lattice mismatch and shell thickness on strain in core@shell nanocrystals

2020 ◽  
Vol 2 (3) ◽  
pp. 1105-1114 ◽  
Author(s):  
Jocelyn T. L. Gamler ◽  
Alberto Leonardi ◽  
Xiahan Sang ◽  
Kallum M. Koczkur ◽  
Raymond R. Unocic ◽  
...  
Keyword(s):  
Phase Analysis ◽  
Geometric Phase ◽  
Shell Thickness ◽  
Lattice Mismatch ◽  
Lattice Relaxation ◽  
Atomistic Simulations ◽  
Core Shell ◽  
Geometric Phase Analysis ◽  
Bimetallic Nanocrystals

Bimetallic nanocrystals with core@shell architectures are versatile particles. Geometric phase analysis of TEM images and atomistic simulations are coupled to reveal the lattice relaxation as a function of lattice mismatch and shell thickness.

scholarly journals Geometric Phase Analysis of Strain in Naturally Deformed Olivine

2003 ◽  
Vol 9 (S02) ◽  
pp. 952-953
Author(s):  
C.L. Johnson ◽  
M.J. Hÿtch ◽  
P.R. Buseck
Keyword(s):  
Phase Analysis ◽  
Geometric Phase ◽  
Geometric Phase Analysis

A Metallographic Technique for High Temperature Creep Damage Assessment in Single Crystal Alloys

1998 ◽  
Author(s):  
Pamela Henderson ◽  
Jacek Komenda
Keyword(s):  
High Temperature ◽  
Single Crystal ◽  
Creep Strain ◽  
Creep Deformation ◽  
Damage Assessment ◽  
Creep Damage ◽  
High Temperature Creep ◽  
Gamma Prime ◽  
Aspect Ratios ◽  
Metallographic Technique

The use of single crystal (SX) nickel-base superalloys will increase in the future with the introduction of SX blades into large gas turbines for base-load electricity production. Prolonged periods of use at high temperatures may cause creep deformation and the assessment of damage can give large financial savings. A number of techniques can be applied for life assessment, e.g. calculations based on operational data, non-destructive testing or material interrogation, but because of the uncertainties involved the techniques are often used in combination. This paper describes a material interrogation (metallographic) technique for creep strain assessment in SX alloys. Creep tests have been performed at 950°C on the SX alloy CMSX-4 and quantitative microstructural studies performed on specimens interrupted at various levels of strain. It was found that the strengthening γ′-particles, initially cuboidal in shape, coalesced to form large plates or rafts normal to the applied stress. The γ-matrix phase also formed plates. CMSX-4 contains ∼ 70 vol % γ′-particles and after creep deformation the microstructure turned itself inside out, i.e. the gamma “matrix” became the isolated phase surrounded by the γ′-“particles”. This can cause problems for computerised image analysis, which in this case, were overcome with the choice of a suitable measurement parameter. The rafts reached their maximum length before 2% strain, but continued to thicken with increasing strain. Although of different dimensions, the aspect ratios (length/thickness ratio) of the gamma-prime rafts and the gamma plates were similar at similar levels of strain, increasing from ∼1 at zero strain to a maximum of ∼3 at about 1–2 % strain. Analysis of microstructural measurements from rafting studies on SX alloys presented in the literature showed that the aspect ratios of the γ- and γ′-phases were similar and that at a temperature of 950–1000°C a maximum length/thickness ratio of about 2.5–3.5 is reached at 1 to 2% creep strain. Measurement of gamma-prime raft or (or gamma plate) dimensions on longitudinal sections of blades is thus a suitable method for high temperature creep damage assessment of SX alloys. This gives a considerable advantage over conventional Ni-base superalloys whose microstructures are usually very stable with respect to increasing creep strain.

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