The Influence of the Working Conditions of the Electrospark Granules Deposition on the Formation of Cracks in Ti-Al Intermetallic Coatings

2021 ◽  
Vol 316 ◽  
pp. 814-820
Author(s):  
Alexander A. Burkov ◽  
Pavel G. Chigrin ◽  
Mariya A. Kulik
Keyword(s):  
Titanium Alloy ◽  
Working Conditions ◽  
Repetition Rate ◽  
Pulse Repetition Rate ◽  
Specific Area ◽  
Coating Structure ◽  
Monotonic Change ◽  
Electrospark Treatment ◽  
Formation Of Cracks ◽  
Titanium Alloy Ti6al4v

Electrospark treatment of a titanium alloy Ti6Al4V in a mixture of granules allows the formation of intermetallic Ti-Al coatings. The coating structure is penetrated by a network of cracks with a thickness of 0.46 to 1.19 microns and a specific area of 1.5 to 3.4%. A change in the ratio of Ti to Al in the mixture of granules does not lead to a monotonic change in the thickness and number of cracks. A decrease in the pulse duration from 200 to 20 μs leads to a slight decrease in the thickness of cracks and significantly increases their total area from 2.1 to 3.4%. An increase in the discharge pulse repetition rate can significantly increase the thickness of cracks in Ti-Al electrospark coatings.

Laser Surface Polishing of Ti6Al4V Titanium Alloy in Air, Nitrogen and Argon Environments

2021 ◽  
Vol 897 ◽  
pp. 15-20
Author(s):  
Pakin Jaritngam ◽  
Viboon Tangwarodomnukun ◽  
Chaiya Dumkum
Keyword(s):  
Surface Roughness ◽  
Titanium Alloy ◽  
Repetition Rate ◽  
Pulse Repetition Rate ◽  
High Repetition Rate ◽  
Laser Surface ◽  
Pulse Repetition ◽  
Polished Surface ◽  
Surface Polishing ◽  
Scan Speed

This paper presents the laser surface polishing of titanium alloy (Ti6Al4V) by using a nanosecond pulse laser. Air, nitrogen and argon were employed as a shielding gas in this study, where the areal roughness (Sa) of laser-polished surface was measured and compared. The results showed that argon was the suitable assist gas for improving the metal surface without causing the oxidation. The effect of laser pulse repetition rate and scan speed on the surface roughness was also investigated in this study. The use of high repetition rate together with slow scan speed was able to reduce the surface roughness of titanium alloy. The roughness was found to be reduced by 47% when the pulse repetition rate of 500 kHz and scan speed of 50 mm/s were applied.

Drilling of titanium alloy (Ti6Al4V) – a review

2021 ◽  
pp. 1-66
Author(s):  
Chua Guang Yuan ◽  
A. Pramanik ◽  
A. K. Basak ◽  
C. Prakash ◽  
S. Shankar
Keyword(s):  
Titanium Alloy ◽  
Titanium Alloy Ti6al4v

scholarly journals Two Approaches to the Laser-Induced Formation of Au/Ag Bimetallic Nanoparticles in Supercritical Carbon Dioxide

Nanomaterials ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1553
Author(s):  
Alexey Rybaltovsky ◽  
Evgeniy Epifanov ◽  
Dmitriy Khmelenin ◽  
Andrey Shubny ◽  
Yuriy Zavorotny ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Ag Nanoparticles ◽  
Repetition Rate ◽  
Pulse Repetition Rate ◽  
Bimetallic Nanoparticles ◽  
Side Wall ◽  
Pulse Repetition ◽  
Gold Core ◽  
Supercritical Carbon

Two approaches are proposed for the synthesis of bimetallic Au/Ag nanoparticles, using the pulsed laser ablation of a target consisting of gold and silver plates in a medium of supercritical carbon dioxide. The differences between the two approaches related to the field of “green chemistry” are in the use of different geometric configurations and different laser sources when carrying out the experiments. In the first configuration, the Ag and Au targets are placed side-by-side vertically on the side wall of a high-pressure reactor and the ablation of the target plates occurs alternately with a stationary “wide” horizontal beam with a laser pulse repetition rate of 50 Hz. In the second configuration, the targets are placed horizontally at the bottom of a reactor and the ablation of their parts is carried out by scanning from above with a vertical “narrow” laser beam with a pulse repetition rate of 60 kHz. The possibility of obtaining Ag/Au alloy nanoparticles is demonstrated using the first configuration, while the possibility of obtaining “core–shell” bimetallic Au/Ag nanoparticles with a gold core and a silver shell is demonstrated using the second configuration. A simple model is proposed to explain the obtained results.

Removal Mechanism of Titanium Alloy Ti6Al4V Based on Single-Grain High Speed Grinding Test

2011 ◽  
Vol 487 ◽  
pp. 39-43 ◽  
Author(s):  
L. Tian ◽  
Yu Can Fu ◽  
W.F. Ding ◽  
Jiu Hua Xu ◽  
H.H. Su
Keyword(s):  
Titanium Alloy ◽  
High Speed ◽  
Chip Thickness ◽  
Wheel Speed ◽  
High Speed Grinding ◽  
Tc4 Alloy ◽  
Grinding Mechanism ◽  
Single Grain ◽  
On Chip ◽  
Titanium Alloy Ti6al4v

Single-grain grinding test plays an important part in studying the high speed grinding mechanism of materials. In this paper, a new method and experiment system for high speed grinding test with single CBN grain are presented. In order to study the high speed grinding mechanism of TC4 alloy, the chips and grooves were obtained under different wheel speed and corresponding maximum undeformed chip thickness. Results showed that the effects of wheel speed and chip thickness on chip formation become obvious. The chips were characterized by crack and segment band feature like the cutting segmented chips of titanium alloy Ti6Al4V.

Development of high-power KrF lasers with a pulse repetition rate up to 5 kHz

2000 ◽  
Vol 30 (9) ◽  
pp. 783-786 ◽  
Author(s):  
V M Borisov ◽  
A Yu Vinokhodov ◽  
V A Vodchits ◽  
A V El'tsov ◽  
A S Ivanov
Keyword(s):  
High Power ◽  
Repetition Rate ◽  
Pulse Repetition Rate ◽  
Pulse Repetition
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