Evolution of Face-Centered Cubic Ti Alloys Transformation by X-ray Diffraction Profile Analysis in Mechanical Alloying

Four titanium alloys (Ti-Ta, Ti-Ta-Sn, Ti-Ta-Mn, and Ti-Nb-Sn) were synthesized by mechanical alloying (MA) in a planetary mill in different times between 2 h and 100 h. The microstructure characterization was made by X-ray diffraction (XRD), in which the Rietveld method was applied to analyze the diffraction patterns. The study demonstrated that after short milling times between 2 h and 30 h, the fraction of hexagonal close-packed (hcp) phase decreases; at the same time, the formation of body-centered cubic (bcc) and face-centered cubic (fcc) Ti phases are promoted. Additionally, after 30 h of MA, the full transformation of hcp-Ti was observed, and the bcc-Ti to fcc-Ti phase transformation took place until 50 h. The results suggest that the addition of Ta and Sn promotes the fcc-Ti phase formation, obtaining 100% of this phase at 50 h onwards, whereas Nb and Mn show the opposite effect.

Download Full-text

X-Ray Diffraction Profile Analysis of Powdered Samples

Powder Diffraction ◽

10.1017/s0885715600016444 ◽

1989 ◽

Vol 4 (2) ◽

pp. 70-73 ◽

Cited By ~ 4

Author(s):

G.J. Stanisz ◽

J.M. Holender ◽

J. Sołtys

Keyword(s):

Powder Diffraction ◽

Profile Analysis ◽

Quantitative Phase Analysis ◽

X Ray Diffraction ◽

Diffraction Profile ◽

X Ray ◽

Experimental Profile ◽

Analytical Functions ◽

Numerical Studies ◽

Diffraction Patterns

AbstractA quantitative phase analysis often requires advanced numerical studies to determine the appropriate intensity values. In this paper the method of fitting analytical functions to the experimental profile is applied to X-ray powder diffraction patterns obtained with FeK radiation. In the present work, the authors examine some problems connected with numerical studies, especially the function describing the experimental profile. The usefulness of the α2 elimination procedure and the angular dependence FWHM are also examined.

Download Full-text

Cation Distribution in Natural Chromites from Oman

Sultan Qaboos University Journal for Science [SQUJS] ◽

10.24200/squjs.vol1iss1pp55-61 ◽

1996 ◽

Vol 1 (1) ◽

pp. 55

Author(s):

Z. Al-Alawi ◽

A.M. Gismelseed ◽

A.A. Yousif ◽

M.A. Worthing ◽

H.H. Sutherland ◽

...

Keyword(s):

Electron Microscopy ◽

Room Temperature ◽

Face Centered Cubic ◽

X Ray Diffraction ◽

Atomic Concentration ◽

X Ray ◽

Diffraction Patterns ◽

Face Centered ◽

Mössbauer Analysis ◽

Scanning Electron

Two specimens or natural chromite from the Oman ophiolite were studied using Mossbauer Spectroscopy (MS), X-ray Diffraction (XRD). and Scanning Electron Microscopy (SEM). The diffraction patterns obtained at room temperature showed that the two specimens have a face-centered cubic spinal structure. Their Mossbauer spectra at 295 K. 160 K and 78 K have been fitted to three doublets. assigned to two Fe 2+ at the tetrahedral (A1+,A2) sites and one Fe1+ at the octahedral (B) site. The ferrous-ferric ratio obtained from the Mossbauer analysis together with the atomic concentration derived from the microprobe data are used to derive the chemical formulae for the two specimens. The data also supports also supports a model of ordered caution distribution in the specimens examined.

Download Full-text

An x‐ray diffraction line profile analysis on the microstructure of cold‐worked face‐centered‐cubic Cu‐Mn‐Si alloys: Effects of Mn and Si as solutes

Journal of Applied Physics ◽

10.1063/1.341662 ◽

1988 ◽

Vol 64 (5) ◽

pp. 2324-2327 ◽

Cited By ~ 8

Author(s):

S. K. Pradhan ◽

M. De

Keyword(s):

Line Profile ◽

Profile Analysis ◽

Diffraction Line ◽

Line Profile Analysis ◽

Face Centered Cubic ◽

X Ray Diffraction ◽

X Ray ◽

Diffraction Line Profile ◽

Cold Worked ◽

Face Centered

Download Full-text

X-Ray diffraction line profile analysis on the microstructure of cold-worked face-centered cubic Cu-Ge-Si alloys: Effects of dilute solutes Si and GE

Metallurgical Transactions A ◽

10.1007/bf02663219 ◽

1989 ◽

Vol 20 (9) ◽

pp. 1883-1885 ◽

Cited By ~ 2

Author(s):

S. K. Pradhan ◽

M. De

Keyword(s):

Line Profile ◽

Profile Analysis ◽

Diffraction Line ◽

Line Profile Analysis ◽

Face Centered Cubic ◽

X Ray Diffraction ◽

X Ray ◽

Diffraction Line Profile ◽

Cold Worked ◽

Face Centered

Download Full-text

Microstructure Evolution During Mechanical Alloying of Face Centered Cubic Ti3Si Nanoparticles

Journal of Nano Research ◽

10.4028/www.scientific.net/jnanor.6.177 ◽

2009 ◽

Vol 6 ◽

pp. 177-184

Author(s):

Qiong Wu ◽

Chang Sheng Li ◽

Hua Tang ◽

Xiao Hui Yu ◽

Ke Sheng Cao ◽

...

Keyword(s):

Mechanical Alloying ◽

Lattice Parameter ◽

Face Centered Cubic ◽

X Ray Diffraction ◽

X Ray ◽

Parameter Ratio ◽

Transmission Electron ◽

Si Nanoparticles ◽

Amorphous Compounds ◽

Face Centered

Face centered cubic Ti3Si nanoparticles were synthesized by mechanical alloying process and the structural and compositional evolutions during the mechanical alloying process were investigated by X-ray diffraction and High Resolution Transmission Electron Microscopy. The results showed that the lattice parameter ratio c/a and the unit cell volume of Ti(Si) were found to decrease with increasing milling time, indicating that the shrinkage of Ti lattice was caused by diffusion of Si atoms into Ti. After milling 51h, amorphous compounds were obtained by alloying Ti and Si powders, and the following mechanical alloying process crystallized the amorphous alloy to crystalline Ti3Si nanoparticles. These nanoparticles were predominantly crystalline with traces of the remnant amorphous phase.

Download Full-text

Growth and Characterization of Electroplated NiO Coatings

Journal of New Materials for Electrochemical Systems ◽

10.14447/jnmes.v17i3.418 ◽

2014 ◽

Vol 17 (3) ◽

pp. 173-177

Author(s):

B. Bharathi ◽

S. Thanikaikarasan ◽

Pratap Kollu ◽

P. V. Chandrasekar ◽

T. Mahalingam ◽

...

Keyword(s):

Face Centered Cubic ◽

X Rays ◽

X Ray Diffraction ◽

X Ray ◽

Potentiostatic Electrodeposition ◽

Direct Band ◽

Diffraction Patterns ◽

Face Centered ◽

Deposited Films

Thin films of NiO have been prepared using potentiostatic electrodeposition technique from an aqueous electrolytic bath containing NiSO4. Deposited films have been characterized using x-ray diffraction, scanning electron microscopy and energy dispersive analysis by x-rays. X-ray diffraction patterns showed that the prepared films possess polycrystalline nature with face centered cubic structure. Surface morphology and film composition showed that films with better stoichiometry and smooth surface are obtained at optimized growth condition. Optical absorption analysis showed that the prepared films possess direct band gap value around 3.46 eV.

Download Full-text

Electron diffraction detection of ordliking in annealed PbTe thin film

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100178227 ◽

1990 ◽

Vol 48 (4) ◽

pp. 1018-1019

Author(s):

Karimat El-Sayed

Keyword(s):

Thin Film ◽

Electron Diffraction ◽

Lead Telluride ◽

Structural Basis ◽

Face Centered Cubic ◽

X Ray ◽

Polycrystalline Thin Films ◽

Stage Process ◽

Diffraction Patterns ◽

Face Centered

Lead telluride is an important semiconductor of many applications. Many Investigators showed that there are anamolous descripancies in most of the electrophysical properties of PbTe polycrystalline thin films on annealing. X-Ray and electron diffraction studies are being undertaken in the present work in order to explain the cause of this anamolous behaviour.Figures 1-3 show the electron diffraction of the unheated, heated in air at 100°C and heated in air at 250°C respectively of a 300°A polycrystalline PbTe thin film. It can be seen that Fig. 1 is a typical [100] projection of a face centered cubic with unmixed (hkl) indices. Fig. 2 shows the appearance of faint superlattice reflections having mixed (hkl) indices. Fig. 3 shows the disappearance of thf superlattice reflections and the appearance of polycrystalline PbO phase superimposed on the [l00] PbTe diffraction patterns. The mechanism of this three stage process can be explained on structural basis as follows :

Download Full-text

Development of Biodegradable Mg-Ti Alloy Synthesized Using Mechanical Alloying

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1133.75 ◽

2016 ◽

Vol 1133 ◽

pp. 75-79 ◽

Cited By ~ 2

Author(s):

Emee Marina Salleh ◽

Sivakumar Ramakrishnan ◽

Zuhailawati Hussain

Keyword(s):

Mechanical Alloying ◽

Milling Time ◽

Milled Powder ◽

Milling Process ◽

Planetary Mill ◽

Ti Alloy ◽

X Ray Diffraction ◽

Argon Flow ◽

Diffraction Patterns ◽

Ti Powder

The aim of this work was to study the effect of milling time on binary magnesium-titanium (Mg-Ti) alloy synthesized by mechanical alloying. A powder mixture of Mg and Ti with the composition of Mg-15wt%Ti was milled in a planetary mill under argon atmosphere using a stainless steel container and balls. Milling process was carried out at 400 rpm for various milling time of 2, 5, 10, 15 and 30 hours. 3% n-heptane solution was added prior to milling process to avoid excessive cold welding of the powder. Then, as-milled powder was compacted under 400 MPa and sintered in a tube furnace at 500 °C in argon flow. The refinement analysis of the x-ray diffraction patterns shows the presence of Mg-Ti solid solution when Mg-Ti powder was mechanically milled for 15 hours and further. Enhancements of Mg-Ti phase formation with a reduction in Mg crystallite size were observed with the increase in milling time. A prolonged milling time has increased the density and hardness of the sintered Mg-Ti alloy.

Download Full-text

Stacking Faults in a High Nitrogen Face-Centered-Cubic Phase Formed on Nitrogen-Modified Austenitic Stainless Steel

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.373-374.318 ◽

2008 ◽

Vol 373-374 ◽

pp. 318-321

Author(s):

J. Liang ◽

M.K. Lei

Keyword(s):

Stainless Steel ◽

Plasma Source ◽

Peak Shift ◽

Cubic Phase ◽

Face Centered Cubic ◽

X Ray Diffraction ◽

High Nitrogen ◽

X Ray ◽

Peak Asymmetry ◽

Face Centered

Effects of stacking faults in a high nitrogen face-centered-cubic phase (γΝ) formed on plasma source ion nitrided 1Cr18Ni9Ti (18-8 type) austenitic stainless steel on peak shift and peak asymmetry of x-ray diffraction were investigated based on Warren’s theory and Wagner’s method, respectively. The peak shift from peak position of the γΝ phase is ascribed to the deformation faults density α, while the peak asymmetry of the γΝ phase is characterized by deviation of the center of gravity of a peak from the peak maximum (Δ C.G.) due to the twin faults density β. The calculated peak positions of x-ray diffraction patterns are consistent with that measured for plasma source ion nitrided 1Cr18Ni9Ti stainless steel.

Download Full-text