The stages of formation of a solid solution during the mechanical alloying of Si and Ge

1993 ◽  
Vol 191 (2) ◽  
pp. 239-242 ◽  
Author(s):  
B.B. Bokhonov ◽  
I.G. Konstanchuk ◽  
V.V. Boldyrev
Keyword(s):  
Solid Solution ◽  
Mechanical Alloying

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.

The formation of metastable Ti–Al solid solutions by mechanical alloying and ball milling

1993 ◽  
Vol 8 (11) ◽  
pp. 2819-2829 ◽  
Author(s):  
M. Oehring ◽  
T. Klassen ◽  
R. Bormann
Keyword(s):  
Solid Solution ◽  
Mechanical Alloying ◽  
Ball Milling ◽  
Intermetallic Compounds ◽  
Phase Formation ◽  
Milling Process ◽  
Study Phase ◽  
Phase Selection ◽  
Powder Blends ◽  
Al Powder

Elemental Ti–Al powder blends were mechanically alloyed in order to study phase formation during the alloying process. In addition, the stability of intermetallic phases upon milling was investigated separately in order to determine the origins of phase selection during the milling process. It was found that by mechanical alloying of powder blends, as well as by ball milling of Ti-aluminides for long milling times, the same metastable phases were formed for corresponding compositions, i.e., the hep solid solution for Al concentrations up to 60 at. % and the fcc solid solution for 75 at. % Al. X-ray diffraction (XRD) analyses indicated that the process of mechanical alloying occurred via the diffusion of Al into Ti. By lowering the milling intensity, a two-phase mixture of the hcp solid solution and the amorphous phase was observed for Ti50Al50 and confirmed by transmission electron microscopy (TEM). The results show that phase selection in the final state during mechanical alloying of Ti–Al powder blends and milling of intermetallic compounds is mainly determined by the energetic destabilization of the competing phases caused by the milling process. The destabilization is most pronounced in the case of intermetallic compounds due to the decrease in long-range order upon milling. For the final milling stage, phase formation can be predicted by considering the relative stabilities of the respective phases calculated by the CALPHAD method using the available thermodynamic data for the Ti–Al system.

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.

Processing and Properties of Nb5Si3/Nb Laminates

1994 ◽  
Vol 350 ◽  
Author(s):  
John Short ◽  
Jan Kajuch ◽  
John J. Lewandowski
Keyword(s):  
Solid Solution ◽  
Mechanical Alloying ◽  
Hot Pressing ◽  
Reactive Sintering ◽  
Mechanically Alloyed ◽  
Pure Niobium ◽  
Commercially Pure ◽  
Heat Treated ◽  
Bend Tests

AbstractMechanical alloying(MA) and Reactive Sintering(RS) techniques were successfully used to produce Nb5Si3. Model laminates of mechanically alloyed Nb5Si3 and commercially pure niobium were prepared via vacuum hot pressing. Tensile properties for the as-received, vacuum heat treated and niobium with a solid solution of silicon were obtained at 298K and 77K. 298K bend tests were conducted in an in situ deformation stage in a SEM. 77K bend tests were also conducted. Toughness values are correlated to the ligament properties and effect of constraint.

Fabrication of the supersaturated solid solution of carbon in copper by mechanical alloying

2007 ◽  
Vol 58 (6) ◽  
pp. 504-508 ◽  
Author(s):  
Xueran Liu ◽  
Yongbing Liu ◽  
Xu Ran ◽  
Jian An ◽  
Zhanyi Cao
Keyword(s):  
Solid Solution ◽  
Mechanical Alloying ◽  
Supersaturated Solid Solution
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