Supersaturated Cu–Li solid solutions produced by mechanical alloying

2006 ◽  
Vol 425 (1-2) ◽  
pp. 334-338 ◽  
Author(s):  
P.A. Rojas ◽  
A. Peñaloza ◽  
C.H. Wörner ◽  
R. Fernández ◽  
A. Zúñiga
Keyword(s):  
Mechanical Alloying ◽  
Solid Solutions

Nanocrystalline FeNi solid solutions prepared by mechanical alloying

1996 ◽  
Vol 7 (4) ◽  
pp. 411-420 ◽  
Author(s):  
V. Hays ◽  
R. Marchand ◽  
G. Saindrenan ◽  
E. Gaffet
Keyword(s):  
Mechanical Alloying ◽  
Solid Solutions

scholarly journals Thermodynamic Analysis of the Formation of FCC and BCC Solid Solutions of Ti-Based Ternary Alloys by Mechanical Alloying

Metals ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 510 ◽  
Author(s):  
Claudio Aguilar ◽  
Carola Martinez ◽  
Karem Tello ◽  
Sergio Palma ◽  
Adeline Delonca ◽  
...  
Keyword(s):  
Free Energy ◽  
Mechanical Alloying ◽  
Gibbs Free Energy ◽  
Thermodynamic Analysis ◽  
Solid Solutions ◽  
Ternary Systems ◽  
Solubility Limit ◽  
Ternary Alloys ◽  
Energy Of Mixing ◽  
Free Energy Of Mixing

A thermodynamic analysis of the synthesis of face-centred cubic (fcc) and body-centred cubic (bcc) solid solutions of Ti-based alloys produced by mechanical alloying was performed. Four Ti-based alloys were analysed: (i) Ti-13Ta-3Sn (at.%), (ii) Ti-30Nb-13Ta (at.%), (iii) Ti-20Nb-30Ta (wt. %) and (iv) Ti-33Nb-4Mn (at.%). The milled powders were characterized by X-ray diffraction, and the crystallite size and microstrain were determined using the Rietveld and Williamson–Hall methods. The Gibbs free energy of mixing for the formation of a solid solution of the three ternary systems (Ti-Ta-Sn, Ti-Nb-Ta and Ti-Nb-Mn) was calculated using an extended Miedema’s model, applying the Materials Analysis Applying Thermodynamics (MAAT) software. The values of the activity of each component were determined by MAAT. It was found that increasing the density of crystalline defects, such as dislocations and crystallite boundaries, changed the solubility limit in these ternary systems. Therefore, at longer milling times, the Gibbs free energy increases, so there is a driving force to form solid solutions from elemental powders. Finally, there is agreement between experimental and thermodynamic data confirming the formation of solid solutions.

Mechanical Alloying of Interstitial Solid Solutions and Compounds

1996 ◽  
Vol 225-227 ◽  
pp. 409-416 ◽  
Author(s):  
Jacques Foct ◽  
R.S. de Figueiredo ◽  
O. Richard ◽  
J.P. Morniroli
Keyword(s):  
Mechanical Alloying ◽  
Solid Solutions

Structural analysis and magnetic properties of solid solutions of Co–Cr system obtained by mechanical alloying

2014 ◽  
Vol 354 ◽  
pp. 178-183 ◽  
Author(s):  
J.A. Betancourt-Cantera ◽  
F. Sánchez-De Jesús ◽  
A.M. Bolarín-Miró ◽  
I. Betancourt ◽  
G. Torres-Villaseñor
Keyword(s):  
Magnetic Properties ◽  
Structural Analysis ◽  
Mechanical Alloying ◽  
Solid Solutions ◽  
Cr System

Synthesis of Nanocrystalline Ag-Cu Supersaturated Solid Solution by Mechanical Alloying

2010 ◽  
Vol 92 ◽  
pp. 271-276 ◽  
Author(s):  
Liang Feng Li ◽  
Tai Qiu ◽  
Jian Yang ◽  
Yong Bao Feng
Keyword(s):  
Electron Microscopy ◽  
Solid Solution ◽  
Mechanical Alloying ◽  
Solid Solutions ◽  
Supersaturated Solid Solution ◽  
Main Peak ◽  
Rich Phase ◽  
Transmission Electron ◽  
Supersaturated Solid Solutions ◽  
Xrd Patterns

Nanocrystalline Ag-28Cu supersaturated solid solution is prepared by mechanical alloying (MA) using a planetary ball mill. The mechanical alloyed powders are characterized by x-ray diffraction (XRD), scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM) and differential scanning calorimeter (DSC). XRD patterns show that the main peak of Ag-28Cu supersaturated solid solution exists at about 2θ=39° when the milling time is 30h. HRTEM images show that the grain sizes of as-prepared solid solutions have distributions from 10nm to 15nm. The interplanar spacing of (111) plane for fcc Ag-28Cu supersaturated solid solution is about 2.24Å. DSC measurement result indicates that the melting temperature of Ag-28Cu supersaturated solid solution is 783.8°C. The Ag(Cu) supersaturated solid solutions are in metastable state and they will be transformed into Ag-rich phase and Cu-rich phase simultaneously by annealing at 215°C- 415°C.

Mathematical Modeling of Solid-State Diffusion during Mechanical Alloying

2006 ◽  
Vol 249 ◽  
pp. 105-110 ◽  
Author(s):  
Boris B. Khina ◽  
Boleslaw Formanek
Keyword(s):  
Plastic Deformation ◽  
Solid State ◽  
Mechanical Alloying ◽  
Solid Solutions ◽  
Point Defects ◽  
Physical Mechanism ◽  
Solid State Diffusion ◽  
State Diffusion ◽  
Wide Range ◽  
Supersaturated Solid Solutions

It is known experimentally that solid-state interdiffusion is substantially enhanced during plastic deformation. This is especially noticeable in Mechanical Alloying (MA) which is used for producing a wide range of metastable materials (supersaturated solid solutions, amorphous phases, nanostructures) with unique properties. However, a physical mechanism of enhanced diffusion during MA is not clearly understood yet, and a comprehensive model of this complex phenomenon has not been developed so far. Moreover, the role of the diffusion process in MA is hotly debated in literature. In this work a new, self-consistent mathematical model of solid-state interdiffusion in a binary substitutional system A-B during periodic plastic deformation is developed. The model includes basic physical factors that affect diffusion, such as generation of non-equilibrium point defects by gliding screw dislocations during deformation and their relaxation in periods between impacts. The cross-link terms are considered, and interaction of point defects with edge dislocations and incoherent phase boundary A/B is taken into account. Computer simulation is performed using realistic data (e.g., quasi-equilibrium self-diffusion coefficients known in literature) and the process parameters typical of MA in a vibratory mill. A repeated “deformation-rest” cycle is considered. The results of modeling reveal the physical mechanism of the enhancement of solid-state diffusion by periodic plastic deformation during MA and demonstrate that within the frame of this approach supersaturated solid solutions can form within a reasonably short processing time.

Sign in / Sign up

Export Citation Format

Share Document