Impact of ZnSe grain boundary density on few-cycle laser-resistance

2021 ◽  
Author(s):  
Yingjie Chai ◽  
MJ Soileau
Keyword(s):  
Grain Boundary ◽  
Boundary Density

Short Channel Poly-Si TFT with Single Grain Boundary by Excimer Laser Annealing on Al-masked a-Si Layer

2002 ◽  
Vol 715 ◽  
Author(s):  
Sang-Hoon Jung ◽  
Jae-Hoon Lee ◽  
Min-Koo Han
Keyword(s):  
Grain Boundary ◽  
Laser Annealing ◽  
Thin Film Transistor ◽  
High Mobility ◽  
Silicon Layer ◽  
Silicon Thin Film ◽  
Short Channel ◽  
Excimer Laser Annealing ◽  
Boundary Density ◽  
Single Grain

AbstractA short channel polycrystalline silicon thin film transistor (poly-Si TFT), which has single grain boundary in the center of channel, is reported. The reported poly-Si TFT employs lateral grain growth method through aluminum patterns, which acts as a selective beam mask and a lateral heat sink during the laser irradiation, on an amorphous silicon layer. The electrical characteristics of the proposed poly-Si TFT have been considerably improved due to grain boundary density lowered. The reported short channel poly-Si TFT with single grain boundary exhibits high mobility as 222 cm2/Vsec and large on/off current ratio exceeding 1 × 108.

scholarly journals Effect of surface grain boundary density on preosteoblast proliferation on titanium

2020 ◽  
Vol 8 (6) ◽  
pp. 239-246 ◽  
Author(s):  
Terry C. Lowe ◽  
Rebecca A. Reiss ◽  
Patrick E. Illescas ◽  
Casey F. Davis ◽  
Melanie C. Connick ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Boundary Density ◽  
Effect Of Surface

scholarly journals Influence of Building Direction on the Oxidation Behavior of Inconel 718 Alloy Fabricated by Additive Manufacture of Electron Beam Melting

Materials ◽  
2018 ◽  
Vol 11 (12) ◽  
pp. 2549 ◽  
Author(s):  
Lv Li ◽  
Xiaojuan Gong ◽  
Xianjue Ye ◽  
Jianwei Teng ◽  
Yan Nie ◽  
...  
Keyword(s):  
Electron Beam ◽  
Grain Boundary ◽  
Inconel 718 ◽  
Electron Beam Melting ◽  
Oxidation Behavior ◽  
Additive Manufacture ◽  
Inconel 718 Alloy ◽  
Temperature Oxidation ◽  
Boundary Density ◽  
High Temperature Oxidation Behavior

This research was aimed at investigating the high temperature oxidation behavior of Inconel 718 superalloy fabricated by electron beam melting with the building direction of 0°, 55° and 90° deviation from the Z axis of cylindrical samples. Columnar γ-fcc phase with preferred crystal orientations was found in all specimens. With the temperature ranging from 700 to 1000 °C, the 0° sample, symbolized by the lowest grain boundary density, and largest grain size, reveals the best oxidation performance. It is concluded that the building direction has more impact on the amount of grain boundary density than crystal orientation, which determined the oxidation resistance.

Soi Formation by a Line-Source Electron Beam and Electrical Characteristics

1987 ◽  
Vol 107 ◽  
Author(s):  
H. Hada ◽  
H. Okabayashi ◽  
S. Saito ◽  
T. Nakamura ◽  
Y. Kawase
Keyword(s):  
Electron Beam ◽  
Grain Boundary ◽  
Line Source ◽  
Field Effect ◽  
Electrical Characteristics ◽  
Field Effect Mobility ◽  
Boundary Density ◽  
Width Direction ◽  
Good Uniformity

AbstractCrystal quality of SOI and electrical characteristics of p-MOSFETs fabricated in SOI films have been studied. The SOI recrystallization is done by a cw-operated, high-power, line-source and line-shaped electron beam annealing. Single crystal SOI strips, 15~20¼mxa few mm in sized, are formed with a good uniformity on a 4 inch diameter wafer by adopting the step and repeat system in the annealing apparatus. p-MOSFETs with ~90% field effect mobility of the bulk values are fabricated in the SOI films. The electrical characteristics of p-MOSFETs, fabricated in the SOI regions beyond the lateral seeding distance (~15¼m), are found to be independent of the low angle grain boundary density in the MOSFET channel, when the low angle grain boundaries extended toward the channel width direction.

Intergranular Corrosion Behavior of 00Cr12 Ferritic Stainless Steels Containing Cerium

2013 ◽  
Vol 690-693 ◽  
pp. 133-138
Author(s):  
Ya Bo Li ◽  
Fu Ming Wang ◽  
Xiao Nong Cheng
Keyword(s):  
Grain Boundary ◽  
Corrosion Behavior ◽  
Stainless Steels ◽  
Intergranular Corrosion ◽  
Optical Microscope ◽  
Mechanism Analysis ◽  
Chromium Depletion ◽  
Ferritic Stainless Steels ◽  
Boundary Density ◽  
Grain Sizes

Intergranular corrosion behavior of 00Cr12 ferritic stainless steels with different amounts cerium was evaluated. For this evaluation, electrochemical measurements - polarization curves - were obtained for tested materials, and optical microscope was used to observe corrosive microstructure. Experimental results shows: cerium reduces grain sizes and improves intergranular corrosion resistance of test materials. Through mechanism analysis: cerium reduces grain sizes, increases grain boundary density, therefore might improve distribution aspects of carbides and nitrides, chromium depletion situation near grain boundary would be improved, this work worth further study.

scholarly journals Anisotropy of Transport Properties Correlated to Grain Boundary Density and Quantified Texture in Thick Oriented Ca3Co4O9 Ceramics

Materials ◽  
2018 ◽  
Vol 11 (7) ◽  
pp. 1224 ◽  
Author(s):  
Driss Kenfaui ◽  
Moussa Gomina ◽  
Jacques Noudem ◽  
Daniel Chateigner
Keyword(s):  
Power Generation ◽  
High Temperature ◽  
Grain Boundary ◽  
Anisotropic Behavior ◽  
Boundary Density ◽  
Microstructural Parameters ◽  
Plasma Sintering ◽  
Marked Enhancement ◽  
Spark Plasma ◽  
The Mean

The misfit-layered Ca3Co4O9 oxide is being seen as a potential thermoelectric (TE) candidate for high-temperature power generation in air. Given the very small size and low strength exhibited by single crystals, grain-oriented Ca3Co4O9 ceramics are worth elaborating to capitalize on their anisotropy. However, the usual textured pellets are too thin to probe the TE properties along their principal crystallographic directions. In this paper, we report on the anisotropy of TE properties in the 350–860 K range within thick textured Ca3Co4O9 ceramics fabricated by moderately pressing at 1173 K stacks of pellets primarily textured using spark plasma sintering (SPS), spark plasma texturing (SPT), and hot pressing (HP). The texture was quantitatively assessed, and the influent microstructural parameters were identified, particularly the grain boundary density parallel (GBDc) and perpendicular (GBDab) to the mean c*-axis. We found that the edge-free processing fostered material texturing and (a,b) plane grain growth, thereby dropping GBDab and increasing GBDc. This resulted in a resistivity ρab reduction, leading to a marked enhancement in power factor PFab, which reached 520 μW·m−1·K−2 at 800 K for the HP sample. The anisotropy ρc/ρab was substantially promoted as the texture was reinforced and the GBDc/GBDab ratio increased, with ρc/ρab (HP) > ρc/ρab (SPT) > ρc/ρab (SPS). The Seebeck coefficient S also revealed an anisotropic behavior, with a ratio Sc/Sab >1 for the SPS-processed materials. This behavior was reversed (Sc/Sab <1) for the more textured SPT and HP specimens. It therefore resulted in a PF anisotropy PFc/PFab (HP) < PFc/PFab (SPT) < PFc/PFab (SPS). The PFab/PFc ratio attained 13.6 at 800 K for the thick HP sample, which is the largest ratio recorded thus far on undoped Ca3Co4O9 ceramics.

Method for Assessing Grain Boundary Density in High-Strength, High-Toughness Ferritic Weld Metal

2016 ◽  
Vol 48 (1) ◽  
pp. 198-207
Author(s):  
Xuanwei Lei ◽  
Jihua Huang ◽  
Shuhai Chen ◽  
Xingke Zhao
Keyword(s):  
Grain Boundary ◽  
Weld Metal ◽  
High Strength ◽  
Boundary Density ◽  
High Toughness

Thermoviscoplasticity in Body-Centered Cubic Metals: A Two-Temperature Model With Grain Boundary Evolution

2020 ◽  
Vol 87 (11) ◽  
Author(s):  
Gurudas Kar ◽  
Debasish Roy ◽  
J. N. Reddy
Keyword(s):  
Plastic Deformation ◽  
Grain Boundary ◽  
Internal Variable ◽  
Dislocation Motion ◽  
Body Centered Cubic ◽  
Boundary Density ◽  
Different Temperatures ◽  
Growth Dislocation ◽  
Thermodynamics Modeling ◽  
Two Temperature

Abstract In this work, we develop a thermo-viscoplasticity model for body-centered cubic (BCC) metals based on a two-temperature theory of nonequilibrium thermodynamics. Modeling the plastic deformation here involves two subsystems, viz., a configurational subsystem related to grain growth, dislocation motion, and a kinetic vibrational subsystem describing the vibration of atoms. Due to a separation of the time scales, the two subsystems are described by two different temperatures. In this study, we introduce a grain boundary density, in addition to the mobile and forest dislocation densities, as an internal variable. The focus in this paper is on how large plastic deformation is affected by the evolving grain boundaries. In order to check the predictive quality of the model, numerical simulations are conducted and validated against available experimental evidence wherever possible.

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