Structural observations during amorphization of chromium-iron nitride powders by mechanical alloying

1992 ◽  
Vol 47 (6) ◽  
pp. 53
Keyword(s):  
Mechanical Alloying ◽  
Iron Nitride

Effect of Hydrogen on Formation of Fe-Al Nanoparticles by Mechanical Milling

2014 ◽  
Vol 29 ◽  
pp. 23-28 ◽  
Author(s):  
František Lukáč ◽  
Jakub Čížek ◽  
Yvonna Jirásková ◽  
Ivan Procházka ◽  
Marian Vlček ◽  
...  
Keyword(s):  
Mechanical Alloying ◽  
High Energy ◽  
Hydrogen Atmosphere ◽  
Nanocrystalline Powders ◽  
Iron Nitride ◽  
Nominal Composition ◽  
Al Nanoparticles ◽  
Air Atmosphere ◽  
Iron Aluminum ◽  
High Concentrations

Nanocrystalline powders of iron aluminum alloy of the Fe82Al18 nominal composition were prepared under air, hydrogen and nitrogen atmospheres from the Fe and Al elemental powders by mechanical alloying and also from the conventionally cast Fe82Al18 alloy by the high-energy ball milling. The intensive plastic deformation during high-energy mechanical treatment has introduced high concentrations of open volume defects and contributed to a rapid decrease in the crystallite size down to a nanoscopic range.The hydrogen atmosphere was found to be the most efficient for the Fe-Al mechanical alloying since it has resulted into the fully alloyed Fe82Al18 after 30 h of milling. On the other hand, the nitrogen and air atmosphere have slightly prevented mechanical alloying and after the same milling time the pure iron particles were still detected in the powder mixtures. This partial suppression of the mechanical alloying process is explained by a formation of thin iron nitride and/or oxide layers on the surface of Fe particles preventing mutual inter-diffusion of Fe and Al atoms.

Characterization of iron nitride powders formed by mechanical alloying and atmospheric heat treatment techniques

2001 ◽  
Vol 24 (6) ◽  
pp. 753-760 ◽  
Author(s):  
Chung‐Kwei Lin ◽  
Giin‐Shan Chen ◽  
Jium‐Shyong Chen ◽  
Tsung‐Shune Chin ◽  
Pee‐Yew Lee
Keyword(s):  
Heat Treatment ◽  
Mechanical Alloying ◽  
Iron Nitride ◽  
Treatment Techniques ◽  
Atmospheric Heat

Preparation of iron nitride powders through mechanical alloying and atmospheric heat treatment

1999 ◽  
Author(s):  
Pee-Yew Lee ◽  
Chung-Kwei Lin ◽  
Chieh-Lung Chang ◽  
Yeukuang Hwu ◽  
Tsung-Shune Chin
Keyword(s):  
Heat Treatment ◽  
Mechanical Alloying ◽  
Iron Nitride ◽  
Atmospheric Heat

Microstructure of mechanically alloyed and hot-pressed Al5CuZr2

1990 ◽  
Vol 48 (4) ◽  
pp. 970-971
Author(s):  
T. E. Mitchell ◽  
P. B. Desch ◽  
R. B. Schwarz
Keyword(s):  
Mechanical Alloying ◽  
Vickers Hardness ◽  
Hot Pressing ◽  
Rapid Quenching ◽  
Hardened Steel ◽  
Alloyed Powder ◽  
Ion Milling ◽  
Mechanical Grinding ◽  
Mechanically Alloyed ◽  
Steel Container

Al3Zr has the highest melting temperature (1580°C) among the tri-aluminide intermetal1ics. When prepared by casting, Al3Zr forms in the tetragonal DO23 structure but by rapid quenching or by mechanical alloying (MA) it can also be prepared in the metastable cubic L12 structure. The L12 structure can be stabilized to at least 1300°C by the addition of copper and other elements. We report a TEM study of the microstructure of bulk Al5CuZr2 prepared by hot pressing mechanically alloyed powder.MA was performed in a Spex 800 mixer using a hardened steel container and balls and adding hexane as a surfactant. Between 1.4 and 2.4 wt.% of the hexane decomposed during MA and was incorporated into the alloy. The mechanically alloyed powders were degassed in vacuum at 900°C. They were compacted in a ram press at 900°C into fully dense samples having Vickers hardness of 1025. TEM specimens were prepared by mechanical grinding followed by ion milling at 120 K. TEM was performed on a Philips CM30 at 300kV.

Mechanical properties of FeAlSi powders prepared by mechanical alloying from different initial feedstock materials

2019 ◽  
Vol 107 (2) ◽  
pp. 207 ◽  
Author(s):  
Jaroslav Čech ◽  
Petr Haušild ◽  
Miroslav Karlík ◽  
Veronika Kadlecová ◽  
Jiří Čapek ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Mechanical Alloying ◽  
Young’S Modulus ◽  
Milling Time ◽  
Young's Modulus ◽  
Element Model ◽  
X Ray Diffraction ◽  
X Ray ◽  
Powder Particles ◽  
Complete Homogenization

FeAl20Si20 (wt.%) powders prepared by mechanical alloying from different initial feedstock materials (Fe, Al, Si, FeAl27) were investigated in this study. Scanning electron microscopy, X-ray diffraction and nanoindentation techniques were used to analyze microstructure, phase composition and mechanical properties (hardness and Young’s modulus). Finite element model was developed to account for the decrease in measured values of mechanical properties of powder particles with increasing penetration depth caused by surrounding soft resin used for embedding powder particles. Progressive homogenization of the powders’ microstructure and an increase of hardness and Young’s modulus with milling time were observed and the time for complete homogenization was estimated.

Sign in / Sign up

Export Citation Format

Share Document