Experimental and theoretical study of redistribution of alloying elements in Ni-based weld joints at high temperatures

2005 ◽  
Vol 13 (8) ◽  
pp. 872-878 ◽  
Author(s):  
J. Sopoušek ◽  
J. Buršík ◽  
P. Brož
Keyword(s):  
High Temperatures ◽  
Theoretical Study ◽  
Alloying Elements ◽  
Weld Joints

Theoretical study of hydrocarbon dehydrogenation at high temperatures

2009 ◽  
Vol 43 (1) ◽  
pp. 74-87 ◽  
Author(s):  
V. N. Babak ◽  
T. B. Babak ◽  
S. E. Zakiev ◽  
L. P. Kholpanov
Keyword(s):  
High Temperatures ◽  
Theoretical Study

Interdiffusion and Microstructure Simulation in Ni and Co Based Overlay Coatings on a Ni Based Superalloy at High Temperatures

2014 ◽  
Vol 922 ◽  
pp. 850-855
Author(s):  
Kang Yuan ◽  
Robert Eriksson ◽  
Ru Lin Peng ◽  
Xin Hai Li ◽  
Sten Johansson ◽  
...  
Keyword(s):  
High Temperature ◽  
High Temperatures ◽  
Alloying Elements ◽  
Turbine Engines ◽  
Microstructure Development ◽  
Diffusion Behavior ◽  
Microstructure Simulation ◽  
Base Materials ◽  
Coating Composition ◽  
Overlay Coatings

In turbine engines, Ni or Co based alloys are used at high temperature, either as base materials, superalloys, or deposited on the surface of superalloys, as coatings. In the present study, two different MCrAlY overlay coatings, Ni and Co based, on a Ni based superalloy IN792 were aged for different times in air at three temperatures, 900°C, 1000°C and 1100°C. The aging processes were simulated by using DICTRA software by focusing on the interdiffusion behavior in the superalloy-coating systems. The results of simulation captured the main microstructural features observed and were used to analyze the diffusion behavior of alloying elements and the corresponding microstructure development. It was found that coating composition and temperature affected significantly the microstructure near the superalloy-coating interface, and their relations were mapped as a summary.

Nanotubols under H2O2 exposure: is it possible to poly-hydroxylate carbon nanotubes?

2019 ◽  
Vol 21 (43) ◽  
pp. 24077-24091 ◽  
Author(s):  
J. Vicente-Santiago ◽  
J. Cornejo-Jacob ◽  
D. Valdez-Pérez ◽  
J. Ruiz-García ◽  
R. A. Guirado-López
Keyword(s):  
Carbon Nanotubes ◽  
Surface Chemistry ◽  
Multiwalled Carbon Nanotubes ◽  
High Temperatures ◽  
Theoretical Study ◽  
Multiwalled Carbon

We present a combined experimental and theoretical study dedicated to analyze the variations in the surface chemistry of hydroxylated multiwalled carbon nanotubes (MWCNTs), so called nanotubols, when exposed to H2O2 at high temperatures.

A Review on Influence of Alloying Elements on the Microstructure and Mechanical Properties of Cu-Al-Ni Shape Memory Alloys

2013 ◽  
Vol 64 (1) ◽  
Author(s):  
Safaa Najah Saud ◽  
Esah Hamzah ◽  
Tuty Asma Abu Bakar ◽  
Raheleh Hosseinian.S
Keyword(s):  
Mechanical Properties ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
High Temperatures ◽  
Al Alloys ◽  
Alloying Elements ◽  
Ability To Work ◽  
Morphology And Structure ◽  
High Transformation

Cu–Al–Ni shape memory alloys (SMAs) have been developed for high temperatures engineering components such as sensor and actuators, due to their ability to work at temperatures near 200°C, rather than NiTi and Cu–Zn–Al alloys whose maximum working temperatures around 100°C. These alloys are widely used because they are much cheaper than NiTi/Cu-Zn-Al and do not require any complicated processing during their manufacturing as do for other shape memory alloys. In addition, these alloys have a small hysteresis and high transformation temperatures compared with other alloys. Despite all these advantages, these alloys have their limitations such as brittleness and low phase recovery strains and stress. The present review describes the role of alloying elements on the properties of Cu-Al-Ni shape memory alloys. It has been found that the additions of alloying elements have a significant effect on the formation, morphology, and structure of the obtained martensite, therefore, the properties of these alloys varied in accordance of these effects.

Theoretical study of thermally stable SiO2/AlN/SiO2 Lamb wave resonators at high temperatures

2014 ◽  
Vol 115 (9) ◽  
pp. 094510 ◽  
Author(s):  
Jie Zou ◽  
Chih-Ming Lin ◽  
Yung-Yu Chen ◽  
Albert P. Pisano
Keyword(s):  
High Temperatures ◽  
Lamb Wave ◽  
Theoretical Study ◽  
Thermally Stable

Theoretical study of the effects of alloying elements on the strength and modulus of β-type bio-titanium alloys

1999 ◽  
Vol 260 (1-2) ◽  
pp. 269-274 ◽  
Author(s):  
Y. Song ◽  
D.S. Xu ◽  
R. Yang ◽  
D. Li ◽  
W.T. Wu ◽  
...  
Keyword(s):  
Titanium Alloys ◽  
Theoretical Study ◽  
Alloying Elements
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