scholarly journals Tuning bilayer period of AlN/CrN superlattice coatings deposited using cathodic arc technique for superior mechanical properties and thermal stability

2022 ◽  
Vol 7 ◽  
pp. 100205
Author(s):  
R. Mundotia ◽  
T. Ghorude ◽  
D.C. Kothari ◽  
A. Kale ◽  
N. Thorat
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Bilayer Period ◽  
Superior Mechanical Properties ◽  
Cathodic Arc

Bulk Fe-Al-C Nanoalloys Made by Mechanically Alloying with Subsequent Spark Plasma Sintering and Their Mechanical Properties

2005 ◽  
Vol 101-102 ◽  
pp. 103-110 ◽  
Author(s):  
Yoritoshi Minamino ◽  
Yuichiro Koizumi ◽  
Nobuhiro Tsuji ◽  
Naoko Hirohata ◽  
Kiyoshi Mizuuchi ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Compression Tests ◽  
Good Thermal Stability ◽  
Environmental Embrittlement ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Superior Mechanical Properties ◽  
Bulk Nanocrystalline ◽  
Rupture Strain

Three kinds of bulk nanocrystalline Fe-24at%Al-Xat%C (X=1,2,4) alloy were produced from Fe and Al powders with addition of methanol by MA with subsequent SPS at 1273K under 64MPa. Their microstructure and mechanical properties were investigated. The compacts have the relative densities of 99.97% (1at%C) to 99.6% (4at%C). The structure of compacts with 1at%C is composed of Fe3Al grains of 1.5µm in diameter and nano k-carbides (Fe3AlC0.5) precipitates, while those of compacts with 2 and 4at%C are composed of nanocrystalline Fe3Al of about 80nm in diameter, nano k-carbides and a-grains of about 1µm in diameter. These structures have the good thermal stability, maintaining the nanostructure even at 973K. The mechanical properties of these compacts were measured by compression tests at R.T. to 973K. The compacts with 1at%C and 2at%C of this work perform the superior mechanical properties (e.g. yield strength of 2.15GPa and rupture strain of 0.14 for compact with 2at%C at R.T.) when compared with the ordinary Fe3Al casting (e.g. 380MPa and 0.12). They also exhibit no environmental embrittlement, which is one of fatal problems for the ordinary Fe3Al mateials.

Metallic Nanoneedles Arrays for TEM Sample Preparation “Lift-Out”

2012 ◽  
Author(s):  
Romaneh Jalilian ◽  
David Mudd ◽  
Neil Torrez ◽  
Jose Rivera ◽  
Mehdi M. Yazdanpanah ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Electron Microscope ◽  
Sample Preparation ◽  
Focused Ion Beam ◽  
Ion Beam ◽  
Beam System ◽  
Transmission Electron ◽  
Nanoneedle Array ◽  
Superior Mechanical Properties ◽  
And Performance

Abstract The sample preparation for transmission electron microscope can be done using a method known as "lift-out". This paper demonstrates a method of using a silver-gallium nanoneedle array for a quicker sharpening process of tungsten probes with better sample viewing, covering the fabrication steps and performance of needle-tipped probes for lift-out process. First, an array of high aspect ratio silver-gallium nanoneedles was fabricated and coated to improve their conductivity and strength. Then, the nanoneedles were welded to a regular tungsten probe in the focused ion beam system at the desired angle, and used as a sharp probe for lift-out. The paper demonstrates the superior mechanical properties of crystalline silver-gallium metallic nanoneedles. Finally, a weldless lift-out process is described whereby a nano-fork gripper was fabricated by attaching two nanoneedles to a tungsten probe.

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