scholarly journals Crystallographic Orientation Distribution Control by Means of Continuous Cyclic Bending in a Pure Aluminum Sheet

2007 ◽  
Vol 48 (8) ◽  
pp. 1992-1997 ◽  
Author(s):  
Yoshimasa Takayama ◽  
Yuji Uchiyama ◽  
Tsuyoshi Arakawa ◽  
Masakazu Kobayashi ◽  
Hajime Kato
Keyword(s):  
Crystallographic Orientation ◽  
Pure Aluminum ◽  
Orientation Distribution ◽  
Aluminum Sheet ◽  
Cyclic Bending

scholarly journals Study and classification of the Crystallographic Orientation Distribution Function of a non-grain oriented electrical steel using computer vision system

2019 ◽  
Vol 8 (1) ◽  
pp. 1070-1083
Author(s):  
Roberto Fernandes Ivo ◽  
Douglas de Araújo Rodrigues ◽  
José Ciro dos Santos ◽  
Francisco Nélio Costa Freitas ◽  
Luis Flaávio Gaspar Herculano ◽  
...  
Keyword(s):  
Computer Vision ◽  
Distribution Function ◽  
Orientation Distribution Function ◽  
Crystallographic Orientation ◽  
Electrical Steel ◽  
Vision System ◽  
Orientation Distribution ◽  
Computer Vision System

Condensation performance of superhydrophobic aluminium surface material used for cooled ceiling panels under highly humid indoor conditions

2021 ◽  
Vol 2069 (1) ◽  
pp. 012121
Author(s):  
Z W Zhong ◽  
J L Niu ◽  
W Ma ◽  
S H Yao ◽  
M Yang ◽  
...  
Keyword(s):  
Superhydrophobic Surface ◽  
Pure Aluminum ◽  
Dew Point ◽  
Aluminum Sheet ◽  
Measured Temperature ◽  
Pure Aluminium ◽  
Radiant Cooling ◽  
Long Time ◽  
Cooled Ceiling ◽  
Indoor Conditions

Abstract The application of radiant cooling systems is very limited in hot and humid areas due to condensation. Research on superhydrophobic surface (SHS) materials has shown the potential of restricting the size of condensate drops on these materials, which provides possibilities for preventing dripping and thereby alleviating condensation risks for cooled ceiling panels, but there are few studies on the anti-condensation performance of these materials under the scale and conditions of building applications. An experimental study of condensation on superhydrophobic materials under indoor conditions is presented in this article. Two material samples with a size of 2.5 cm, including a superhydrophobic aluminum sheet and a pure aluminium sheet, were affixed on a cooled ceiling panel to perform the experiment under the following condition: temperature is 25°C ± 0.5°C, relative humidity is 80% ± 5%, and air dew point is 21.4°C. The panel was cooled by chilled water of 6°C for eight hours. The measured temperature on sample surfaces was about 13.5°C during the experiment. After eight-hour condensation, the diameter of drops on the superhydrophobic aluminum sheet was less than 150 μm, while the max drop on the pure aluminum sheet was near 4 mm. The results suggested that the size of condensate drops on superhydrophobic surface materials can be largely restricted during a long-time indoor operation below the dew point, which shows their potential for constructing condensation-free radiant cooling panels.

Effects of Punch Cross-Section on Deep-Drawability of Square Shell of Aluminum Sheet

1987 ◽  
Vol 109 (4) ◽  
pp. 355-361 ◽  
Author(s):  
N. Kawai ◽  
T. Mori ◽  
H. Hayashi ◽  
F. Kondoh
Keyword(s):  
Crack Initiation ◽  
Cross Section ◽  
Pure Aluminum ◽  
Metal Flow ◽  
Aluminum Sheet ◽  
Forming Limit ◽  
Planar Anisotropy ◽  
Deep Drawability ◽  
Commercially Pure ◽  
Relief Effect

Effects of product shape and a planar-anisotropy on a square shell drawability were studied, using commercially pure aluminum sheet. Two phenomena were mainly considered to affect a forming limit: (a) the prevention of crack initiation at the corner of a punch by adjacent straight punch profile regions, (b) the metal flow in the flange region from the corner to the straight side, the “Strain Relief Effect,” which serves to decrease the deformation at the corner.

Effect of Creep Deformation on the Crystallographic Orientation Distribution in Ni Base Superalloy

2007 ◽  
Vol 26-28 ◽  
pp. 213-216 ◽  
Author(s):  
Toru Inoue ◽  
Katsushi Tanaka ◽  
Hiroki Adachi ◽  
Kyosuke Kishida ◽  
Haruyuki Inui
Keyword(s):  
Creep Deformation ◽  
Crystallographic Orientation ◽  
Orientation Distribution ◽  
Diffraction Peak ◽  
High Temperature Creep ◽  
Rocking Curve ◽  
Burgers Vector ◽  
X Ray ◽  
Creep Deformations ◽  
Base Superalloy

The crystallographic orientation distribution, and its change as a function of creep deformation in Ni-based single crystal superalloys have been investigated by X-ray diffractometry. The distribution of the crystallographic orientation has significantly broadened by creep deformations. Directional broadening of the distribution agrees with creep dislocations having the burgers vector of 1/2<101>. High temperature creep strain of superalloys can be estimated by a non-destractive test where the width of rocking curve of a diffraction peak is measured.

scholarly journals Correlation between Laser-Ultrasound and Microstructural Properties of Laser Melting Deposited Ti6Al4V/B4C Composites

Metals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1951
Author(s):  
Wanwei Xu ◽  
Xue Bai ◽  
Zhonggang Sun ◽  
Xin Meng ◽  
Zhongming Guo
Keyword(s):  
Ultrasonic Velocity ◽  
Crystallographic Orientation ◽  
Orientation Distribution ◽  
Ultrasonic Waves ◽  
Microstructural Properties ◽  
Laser Melting ◽  
Distribution Width ◽  
Spectral Centroid ◽  
Α Phase ◽  
Centroid Frequency

The presence of large microtextured clusters (MTC) composed of small α-phase crystallites with preferred crystallographic orientations in 3D printed near-α titanium alloys leads to poor mechanical and fatigue properties. It is therefore crucial to characterize the size of MTCs nondestructively. Ti6Al4V/B4C composite materials are manufactured using Laser Melting Deposition (LMD) technology by adding an amount of nano-sized B4C particles to the original Ti6Al4V powder. TiB and TiC reinforcements precipitating at grain boundaries stimulate the elongated α crystallites and coarse columnar MTCs to equiaxed transition, and microstructures composed of approximately equiaxed MTCs with different mean sizes of 11–50 μm are obtained. Theoretical models for scattering-induced attenuation and centroid frequency downshift of ultrasonic waves propagating in such a polycrystalline medium are presented. It is indicated that, the studied composite material has an extremely narrow crystallographic orientation distribution width, i.e., a strong degree of anisotropy in MTCs. Therefore, MTCs make a dominant contribution to the total scattering-induced attenuation and spectral centroid frequency downshift, while the contribution of fine α-phase crystallites is insignificant. Laser ultrasonic inspection is performed, and the correlation between laser-generated ultrasonic wave properties and microstructural properties of the Ti6Al4V/B4C composites is analyzed. Results have shown that the deviation between the experimentally measured ultrasonic velocity and the theoretical result determined by the Voigt-averaged velocity in each crystallite is no more than 2.23%, which is in good agreement with the degree of macroscopically anisotropy in the composite specimens. The ultrasonic velocity seems to be insensitive to the size of MTCs, while the spectral centroid frequency downshift is approximately linear to the mean size of MTCs with a goodness-of-fit (R2) up to 0.99. Actually, for a macroscopically untextured near-α titanium alloy with a relatively narrow crystallographic orientation distribution, the ultrasonic velocity is not correlated with the properties of MTCs, by contrast, the central frequency downshift is dominated by the size and morphology of MTCs, showing great potentials in grain size evaluation.

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