A Comparative Study of the Nanocrystalline Material Produced by Sliding Wear and Inert Gas Condensation

1990 ◽  
Vol 206 ◽  
Author(s):  
S. K. Ganapathi ◽  
M. Aindow ◽  
H. L. Fraser ◽  
D. A. Rigney
Keyword(s):  
Sliding Wear ◽  
Nanocrystalline Material ◽  
Rate Sensitivity ◽  
High Resolution Electron Microscopy ◽  
Inert Gas ◽  
Gas Condensation ◽  
Inert Gas Condensation ◽  
Fine Grain ◽  
Resolution Electron ◽  
Good Agreement

ABSTRACTA High Resolution Electron Microscopy (HREM) study of grain boundaries in nanocrystalline copper produced by sliding wear and by inert gas condensation is described. The results in both cases are essentially the same and similar to those in conventional polycrystals. Contrary to reports in the literature, these results do not indicate the presence of a fundamentally different structure in nanocrystalline materials. Measurements of the mechanical properties (such as yield strength, elastic modulus and strain rate sensitivity) of these materials using nanoindentation are also presented. These are found to be in good agreement with values expected from a polycrystalline material with a very fine grain size.

HREM CHARACTERIZATION OF GOLD-CLUSTER STRUCTURES

1996 ◽  
Vol 03 (01) ◽  
pp. 1195-1198 ◽  
Author(s):  
H.Q. ZHANG ◽  
M. HAN ◽  
Q. WANG ◽  
G.H. WANG
Keyword(s):  
Short Range ◽  
Gold Cluster ◽  
Structural Features ◽  
Gold Clusters ◽  
Inert Gas ◽  
Gas Condensation ◽  
Inert Gas Condensation ◽  
Resolution Electron ◽  
High Resolution Electron Microscope

High-resolution electron microscope (HREM) and computer simulation are used to investigate structural features of gold clusters produced by the inert-gas condensation method. The results indicate that (i) smaller clusters have multiple-twinned-like structure while those larger than 150 Å in diameter show single-crystal structure; (ii) the former cluster consists of either decahedral or icosahedral form and the atomic planes are not strictly parallel and distances between the planes increase towards the cluster edge; and (iii) grain boundaries between the clusters have twin structures with both long- and short-range orders.

Highly Size-Controlled Synthesis of Metal Nanoclusters by Inert-Gas Condensation for Nano-Devices

2010 ◽  
Vol 10 (5) ◽  
pp. 3667-3670 ◽  
Author(s):  
Il-Suk Kang ◽  
Hyun-Sang Seo ◽  
Deuk-Han Kim ◽  
Taek-Yeong Lee ◽  
Jun-Mo Yang ◽  
...  
Keyword(s):  
Inert Gas ◽  
Controlled Synthesis ◽  
Metal Nanoclusters ◽  
Gas Condensation ◽  
Inert Gas Condensation ◽  
Size Controlled

Inert gas condensation of Sb, Bi and Pb clusters

1981 ◽  
Vol 106 (1-3) ◽  
pp. A170
Author(s):  
J. Mühlbach ◽  
E. Recknagel ◽  
K. Sattler
Keyword(s):  
Inert Gas ◽  
Gas Condensation ◽  
Inert Gas Condensation

Formation Mechanism of Fe Nanocubes by Magnetron Sputtering Inert Gas Condensation

ACS Nano ◽  
2016 ◽  
Vol 10 (4) ◽  
pp. 4684-4694 ◽  
Author(s):  
Junlei Zhao ◽  
Ekaterina Baibuz ◽  
Jerome Vernieres ◽  
Panagiotis Grammatikopoulos ◽  
Ville Jansson ◽  
...  
Keyword(s):  
Magnetron Sputtering ◽  
Formation Mechanism ◽  
Inert Gas ◽  
Gas Condensation ◽  
Inert Gas Condensation

EFFECTIVE MAGNETIC ANISOTROPY AND COERCIVITY IN Fe NANOPARTICLES PREPARED BY INERT GAS CONDENSATION

2006 ◽  
Vol 20 (01) ◽  
pp. 37-47
Author(s):  
LUBNA RAFIQ SHAH ◽  
BAKHTYAR ALI ◽  
S. K. HASANAIN ◽  
A. MUMTAZ ◽  
C. BAKER ◽  
...  
Keyword(s):  
Room Temperature ◽  
Size Range ◽  
Magnetic Measurements ◽  
Uniaxial Anisotropy ◽  
Inert Gas ◽  
Condensation Process ◽  
Gas Condensation ◽  
Inert Gas Condensation ◽  
Fe Nanoparticles ◽  
Characterization Studies

We present magnetic measurements on iron ( Fe ) nanoparticles in the size range 10–30 nm produced by the Inert Gas Condensation process (IGC). Structural characterization studies show the presence of a core/shell structure, where the core is bcc Fe while the surface layer is Fe -oxide. Analysis of the magnetic measurements shows that the nanoparticles display very large uniaxial anisotropy, K eff ≈3 - 4 × 106 erg/cc. The observed room temperature coercivities lie in the range ≈600 – 973 Oe , much larger than those expected from the Stoner–Wohlfarth model using the bulk iron anisotropy. It can be inferred from the coercivity variation with the particle size that there is a general trend of the coercivity increasing with size, culminating finally in a decrease for high sizes (30 nm) possibly due to the onset of non-coherent magnetization reversal processes.

scholarly journals Forming pressure effect on microstructure and mechanical properties of nanocrystalline aluminum synthesized by inert gas condensation

2019 ◽  
Vol 79 ◽  
pp. 02002
Author(s):  
Shangshu Wu ◽  
Zhou Yu ◽  
Junjie Wang ◽  
Hanxin Zhang ◽  
Chaoqun Pei ◽  
...  
Keyword(s):  
Room Temperature ◽  
High Vacuum ◽  
Inert Gas ◽  
Helium Atmosphere ◽  
Gas Condensation ◽  
Inert Gas Condensation ◽  
In Situ Forming ◽  
Nanocrystalline Aluminum ◽  
Al Powder

The preparation of nanocrystalline aluminum (NC Al) was conducted in two steps. After the NC Al powder was synthesized by an Inert gas condensation (IGC) method in a helium atmosphere of 500 Pa, the NC Al powder was in-situ compacted into a pellet with a 10 mm diameter and 250 μm-300 μm thickness in a high vacuum (10-6 Pa-10-7 Pa) at room temperature. The NC Al samples were not exposed to air during the entire process. After the pressure reached 6 GPa, the relative density could reach 99.83%. The results showed that the grain size decreased with the increased of in-situ forming pressure. The NC Al samples present obvious ductile fracture, and the tensile properties were greatly changed with the increase of forming pressure.

On the formation of ternary metallic-dielectric multicore-shell nanoparticles by inert-gas condensation method

2015 ◽  
Vol 151 ◽  
pp. 275-281 ◽  
Author(s):  
Maria Benelmekki ◽  
Jerome Vernieres ◽  
Jeong-Hwan Kim ◽  
Rosa-E. Diaz ◽  
Panagiotis Grammatikopoulos ◽  
...  
Keyword(s):  
Inert Gas ◽  
Shell Nanoparticles ◽  
Gas Condensation ◽  
Inert Gas Condensation ◽  
Condensation Method
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