Microstructural Characterization of Multi-Component Systems Produced by Mechanical Alloying

2009 ◽  
Vol 1243 ◽  
Author(s):  
R. Pérez-Bustamante ◽  
C.D. Gómez-Esparza ◽  
F. Pérez-Bustamante ◽  
I. Estrada-Guel ◽  
J.G. Cabañas-Moreno ◽  
...  
Keyword(s):  
Solid Solution ◽  
Binary System ◽  
Mechanical Alloying ◽  
Microstructural Characterization ◽  
Lattice Parameter ◽  
System A ◽  
Limited Solid Solubility ◽  
Component Systems ◽  
Small Change

ABSTRACTA series of binary to hexanary alloys (Ni, Co, Mo, Al, Fe, Cu) are produced by mechanical alloying. Formation of an FCC solid solution is observed in the binary system. For ternary to quinary systems the presence of an amorphous phase and a BCC solid solution is identified, and for the hexanary system a combination of BCC and FCC solid solutions is detected. There is a very small change in the lattice parameter of Mo, reflecting the limited solid solubility of other element in this structure. However, Mo induces the fast amorphization of other elements and the reduction of crystallite size.

Elaboration, Structure and Mössbauer Spectroscopy of Nanostructured Fe100−xSix Powders Elaborated by Mechanical Alloying

SPIN ◽  
2017 ◽  
Vol 07 (02) ◽  
pp. 1750002 ◽  
Author(s):  
M. Hemmous ◽  
A. Guittoum
Keyword(s):  
Magnetic Field ◽  
Solid Solution ◽  
Mechanical Alloying ◽  
Hyperfine Magnetic Field ◽  
Lattice Parameter ◽  
X Ray Diffraction ◽  
X Ray ◽  
Grain Sizes ◽  
The Mean ◽  
Xrd Studies

We have studied the effect of the silicon concentration on the structural and hyperfine properties of nanostructured Fe[Formula: see text]Six powders ([Formula: see text], 20, 25 and 30[Formula: see text]at.%) prepared by mechanical alloying. The X-ray diffraction (XRD) studies indicated that after 72[Formula: see text]h of milling, the solid solution bcc-[Formula: see text]-Fe(Si) is formed. The grain sizes, [Formula: see text]D[Formula: see text] (nm), decreases with increasing Si concentration and reaches a minimum value of 11[Formula: see text]nm. We have found that the lattice parameter decreases with increasing Si concentration. The changes in values are attributed to the substitutional dissolution of Si in Fe matrix. From the adjustment of Mössbauer spectra, we have shown that the mean hyperfine magnetic field, [Formula: see text]H[Formula: see text] (T), decreases with increasing Si concentration. The substitutional dependence of [Formula: see text]H[Formula: see text] (T) can be attributed to the effect of p electrons Si influencing electrons d of Fe.

THEORETICAL CALCULATION OF ATOMIC STRAIN ON MECHANICAL ALLOYED METASTABLE INTERMETALLIC

2009 ◽  
Vol 16 (01) ◽  
pp. 157-160
Author(s):  
L. PANG ◽  
J. XU ◽  
J. ZHANG
Keyword(s):  
Solid Solution ◽  
Solid State ◽  
Binary System ◽  
Mechanical Alloying ◽  
Theoretical Calculation ◽  
Solid State Reaction ◽  
Lattice Strain ◽  
Electron Theory ◽  
Strain Behavior ◽  
Good Coincidence

Mechanical alloying (MA) has been utilized to synthesize many equilibrium and/or nonequilibrium phases. During the MA process, alloys are formed by the solid-state reaction. Solid solution has been obtained by MA, strain occurs due to the dissolution one component in the binary system. An understanding of the strain in mechanical alloyed Ti – Al , Fe – Al , Ni – Al from the electronic level has remained elusive. In this communication, atomic strain behavior of Ti – Al , Fe – Al , Ni – Al systems is analyzed on the basis of the TFDC (abbreviation of the name of Thomas, Fermi, Dirac, and Cheng) electron theory. Lattice strain of Ti , Fe , Ni , and Al are compared with available experimental results. A very good coincidence was found.

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.

FABRICATION AND CHARACTERIZATION OF NANOSTRUCTURED CU-15WT.% MO COMPOUND BY MECHANICAL ALLOYING

2012 ◽  
Vol 05 ◽  
pp. 456-463
Author(s):  
Soheil Sabooni ◽  
Tayebeh Mousavi ◽  
Fathallah Karimzadeh
Keyword(s):  
Solid Solution ◽  
Mechanical Alloying ◽  
Structural Evolution ◽  
Weight Percent ◽  
Chromium Steel ◽  
X Ray Diffraction ◽  
Milling Operation ◽  
Powder Particles ◽  
Solid Solution Matrix

In the present study nanostructured Cu ( Mo ) compound with 15 weight percent Mo was produced by mechanical alloying using a planetary ball mill. The milling operation was carried out in hardened chromium steel vial and balls under argon atmosphere with a constant ball to powder ratio of 10:1. The structural evolution and characterization of powder particles after different milling times were studied by X-Ray Diffraction, SEM observation and Microhardness measurements. The results showed the displacement of broadened Cu peaks to lower angles, because of dissolving Mo in Cu . The final product was a nanocomposite contains nanocrystalline Cu ( Mo ) supersaturated solid solution matrix and dispersion of nanometric Mo reinforcements. The microhardness of formed nanocomposite increased to 350HV because of grain refinement, formation of solid solution and dispersion hardening.

Microstructural Characterization and Mechanical Properties of Laser Deposited High Entropy Alloys

2014 ◽  
Vol 783-786 ◽  
pp. 2370-2375
Author(s):  
Harihar Sistla ◽  
Joseph W. Newkirk ◽  
F. Frank Liou
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Microstructural Characterization ◽  
Alloy System ◽  
Lattice Parameter ◽  
Laser Deposition ◽  
Advanced Materials ◽  
Mechanical And Thermal Properties ◽  
High Entropy Alloys ◽  
High Entropy

High entropy alloys have attracted great interest due to their flexibility in composition accompanied with very interesting properties, which make these materials candidates for further research. The formation of single solid solution phases as a preference to complex mixtures of intermetallic phases leads to good mechanical and thermal properties. Additive manufacturing in the form of Laser deposition presents us with a very unique way to manufacture near net shape metallic components with advanced materials. The present study focusses on the characterization of High entropy alloys manufactured through laser deposition. The alloy system considered for this study is (AlFeCoCrNi). The ratio of aluminum to nickel was decreased to observe the transition of the solid solution from a BCC structure to a FCC structure. The lattice parameter increased from .288 nm to .357 nm and the hardness decreased from Hv 670 to Hv 149 respectively. The effect of composition on thermodynamic variables, microstructure and mechanical properties were analyzed.

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