Characterization of Mo–Si–B Nanocomposite Powders Produced Using Mechanical Alloying and Powder Heat Treatment

2015 ◽  
Vol 31 (10) ◽  
pp. 995-1000 ◽  
Author(s):  
Bin Li ◽  
Guojun Zhang ◽  
Feng Jiang ◽  
Shuai Ren ◽  
Gang Liu ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Mechanical Alloying ◽  
Nanocomposite Powders

Characterization of Ni75Mo25 Alloy Prepared by Mechanical Alloying and Heat Treatment

2013 ◽  
Vol 203-204 ◽  
pp. 394-397
Author(s):  
Joanna Panek ◽  
Bożena Bierska-Piech ◽  
Jolanta Niedbała
Keyword(s):  
Heat Treatment ◽  
Mechanical Alloying ◽  
Weight Ratio ◽  
Milling Process ◽  
Particle Sizes ◽  
X Ray Diffraction ◽  
Powder Synthesis ◽  
X Ray ◽  
Microscopy Techniques

The process of Ni75Mo25powder synthesis via mechanical alloying (MA) was studied. Process was carried out from pure elements: Ni and Mo with a particle size under 150 μm. A ball-to-powder weight ratio and the rotational speed were 5:1 and 500 rpm, respectively. Oxidation was reduced by milling under an argon atmosphere. The milling process was performed during up to 60 hours. X-ray diffraction (XRD) and scanning electron microscopy techniques have been used to investigate resulting products. It was found that the particle sizes decrease with the increase in milling time. The resulting powder consists of metastable Ni(Mo) and Mo(Ni) solid solutions. Milled Ni75Mo25 powder was subjected to heat treatment at temperature of 773K, 973K and 1173K. As a result of annealing the formation of Ni4Mo and NiMo intermetallic phases was observed.

Microstructural Characterization of Al-Zr Alloy with Nano-Sized Grains

2006 ◽  
Vol 326-328 ◽  
pp. 429-432 ◽  
Author(s):  
Il Ho Kim ◽  
C.S. Kim ◽  
K.T. Kim ◽  
Yong Hwan Kim
Keyword(s):  
Heat Treatment ◽  
Mechanical Alloying ◽  
Microstructural Characterization ◽  
Control Agent ◽  
Process Control Agent ◽  
Grain Sizes ◽  
Treatment Processes ◽  
The Stability ◽  
Zr Alloy

The mechanical alloying processes was employed to fabricate Al-4at.%Zr alloy with nano-sized grains and very fine Al3Zr compounds. The phase transformations and the stability of the phases formed during mechanical alloying and heat treatment processes were investigated. The grain sizes of the alloys immediately after milling and following the subsequent heat treatment at 550°C were 54.2nm and 106.4nm, respectively. Some of Zr atoms were dissolved into the Al matrix and most of them reacted with hydrogen produced by decomposition of PCA(process control agent) to form ZrH2 during mechanical alloying process. These ZrH2 hydrides decomposed gradually after the heat treatment. Stable Al3Zr with a DO23 structure was formed by heat treatment at temperature of more than 4500C. The hardness of the Al-4at.%Zr alloy was more than two times higher than those of other Al-based alloys.

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

Synthesis and characterization of MoSi2-Mo5Si3 nanocomposite by mechanical alloying and heat treatment

2012 ◽  
Vol 31 ◽  
pp. 236-241 ◽  
Author(s):  
Shahrouz Zamani ◽  
Hamid Reza Bakhsheshi-Rad ◽  
Ali Shokuhfar ◽  
Mohamad Reza Vaezi ◽  
Mohammed Rafiq Abdul Kadir ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Mechanical Alloying ◽  
Synthesis And Characterization

Characterization of Al/SiC Nanocomposite Prepared by Mechanical Alloying Method

2007 ◽  
Vol 553 ◽  
pp. 257-265 ◽  
Author(s):  
Ali Shokuhfar ◽  
M.R. Dashtbayazi ◽  
M.R. Alinejad ◽  
Tolou Shokuhfar
Keyword(s):  
Particle Size ◽  
Mechanical Alloying ◽  
Research Work ◽  
High Energy ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
High Energy Ball Mill ◽  
Energy Ball ◽  
Nanocomposite Powders

In this research work, a high-energy ball mill has been applied to prepare an Al/SiC nanocomposite. The formation mechanism of the nanocomposite was investigated. This nanocomposite contained the nanocrystalline characteristics. Crystallite size, lattice strain and particle size of the nanocomposite as a function of milling time were determined. SEM micrographs showed that the nanocomposite powders agglomerated after milling. The particle size analysis confirmed the agglomeration of the nanocomposite particles. TEM observations showed that the SiC particles were in the nanometer size and these particles embedded in the Al matrix, and the nanocomposite produced in the final stage of mechanical alloying. In addition, a simple model checked for the refinement of the crystallite and the particle size of nanocomposite.

CHARACTERIZATION OF ENHANCED FIELD EMISSION SITES ON NIOBIUM SURFACES DUE TO HEAT TREATMENT

1986 ◽  
Vol 47 (C7) ◽  
pp. C7-133-C7-138 ◽  
Author(s):  
N. SANKARRAMAN ◽  
Ph. NIEDERMANN ◽  
R. J. NOER ◽  
O. FISCHER
Keyword(s):  
Heat Treatment ◽  
Field Emission
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