Study of The Quasicrystal Formation in Zr46.8Ti8.2Cu7.5Ni10Be27.5 Bulk Metallic Glass

2002 ◽  
Vol 754 ◽  
Author(s):  
J.L. Soubeyroux ◽  
J.M. Pelletier ◽  
B. Van de Moortèle ◽  
T. Epicier
Keyword(s):  
High Resolution ◽  
Electron Diffraction ◽  
Metallic Glasses ◽  
Melt Spinning ◽  
Isothermal Annealing ◽  
Primary Phase ◽  
High Resolution Tem ◽  
In Situ Neutron Diffraction ◽  
Primary Crystals

ABSTRACTThe formation of the primary crystals appearing during isothermal annealing of the Zr46.8Ti8.2Cu7.5Ni10Be27.5 (Vit4) bulk metallic glasses has been studied by in-situ neutron diffraction, DSC, high resolution TEM and electron diffraction. We have evidenced that the primary phase appearing on the isothermal plateau at 620 K is quasicrystalline and is beryllium free. Moreover, we have prepared an alloy with the composition determined by EDX (without beryllium), and studied the formation of quasicrystals in this alloy. A comparison is done between the quasicrystalline phases appearing during the annealing of Vit4 and the quasicrystals prepared without beryllium in an amorphous alloy prepared by melt spinning. In particular they have the same intensities and peak positions in the diffraction studies.

scholarly journals Quasicrystal Formation in the System Zr75-xTixCu25-yNiy

2005 ◽  
Vol 475-479 ◽  
pp. 3563-3566 ◽  
Author(s):  
Jean Louis Soubeyroux ◽  
Jean Marc Pelletier
Keyword(s):  
Melt Spinning ◽  
Quasicrystalline Phase ◽  
X Ray Diffraction ◽  
X Ray ◽  
Amorphous Phases ◽  
Dsc Studies ◽  
In Situ Neutron Diffraction ◽  
Primary Crystals ◽  
Crystallization Study

During the crystallization study of the bulk metallic glass 46.8Ti8.2Cu7.5Ni10Be27.5 (Vit4) we have demonstrated that the primary crystals appearing during isothermal annealing in the glass region, above Tg and before Tx, were of quasicrystalline nature and beryllium free. The formula of the quasicrystalline phase so obtained and determined by electron techniques (EDX and EELS) was Zr63Ti14.4Ni12.4Cu10.2. We have synthesized phases in the system Zr75-xTixCu25-yNiy by melt spinning and obtained either amorphous or quasicrystalline phases. For the amorphous phases, we have studied the crystallization by in-situ neutron diffraction and obtained quasicrystals as primary crystals. Neutron and X-ray diffraction, DSC studies are presented.

TEM Analysis of Long-Period Polytypes in SiC—S

1976 ◽  
Vol 34 ◽  
pp. 630-631
Author(s):  
S. Shinozaki ◽  
J. W. Sprys
Keyword(s):  
Electron Diffraction ◽  
Isothermal Annealing ◽  
Tem Analysis ◽  
Long Period ◽  
Transmission Electron ◽  
Average Grain Size ◽  
High Resolution Tem ◽  
Structural Lattice ◽  
The Stability ◽  
Continuous Curves

In reaction sintered SiC (∽ 5um average grain size), about 15% of the grains were found to have long-period structures, which were identifiable by transmission electron microscopy (TEM). In order to investigate the stability of the long-period polytypes at high temperature, crystal structures as well as microstructural changes in the long-period polytypes were analyzed as a function of time in isothermal annealing.Each polytype was analyzed by two methods: (1) Electron diffraction, and (2) Electron micrograph analysis. Fig. 1 shows microdensitometer traces of ED patterns (continuous curves) and calculated intensities (vertical lines) along 10.l row for 6H and 84R (Ramsdell notation). Intensity distributions were calculated based on the Zhdanov notation of (33) for 6H and [ (33)3 (32)2 ]3 for 84R. Because of the dynamical effect in electron diffraction, the observed intensities do not exactly coincide with those intensities obtained by structure factor calculations. Fig. 2 shows the high resolution TEM micrographs, where the striped patterns correspond to direct resolution of the structural lattice periodicities of 6H and 84R structures and the spacings shown in the figures are as expected for those structures.

Reinvestigation of Li2MnO3Structure: Electron Diffraction and High Resolution TEM

2009 ◽  
Vol 21 (18) ◽  
pp. 4216-4222 ◽  
Author(s):  
A. Boulineau ◽  
L. Croguennec ◽  
C. Delmas ◽  
F. Weill
Keyword(s):  
High Resolution ◽  
Electron Diffraction ◽  
High Resolution Tem

Effects of Phosphorus Exposure on Arsenic-Stabilized GaAs 2×4 Surface

1993 ◽  
Vol 312 ◽  
Author(s):  
A. H. Bensaoula ◽  
A. Freundlich ◽  
A. Bensaoula ◽  
V. Rossignol
Keyword(s):  
High Resolution ◽  
Electron Diffraction ◽  
Growth Process ◽  
High Energy ◽  
Ex Situ ◽  
Chemical Beam Epitaxy ◽  
High Energy Electron ◽  
X Ray Diffraction ◽  
X Ray

AbstractPhosphorus exposed GaAs (100) surfaces during a Chemical Beam Epitaxy growth process are studied using in-situ Reflection High Energy Electron Diffraction and ex-situ High Resolution X-ray Diffraction. It is shown that the phosphorus exposure of a GaAs (100) surface in the 500 – 580 °C temperature range results in the formation of one GaP monolayer.

scholarly journals In situ Nanobeam Electron Diffraction of Bulk Metallic Glasses

2018 ◽  
Vol 24 (S1) ◽  
pp. 206-207 ◽  
Author(s):  
Thomas C. Pekin ◽  
Colin Ophus ◽  
Christoph Gammer ◽  
Burak Ozdol ◽  
R.O. Ritchie ◽  
...  
Keyword(s):  
Electron Diffraction ◽  
Metallic Glasses ◽  
Bulk Metallic Glasses

Research on Laser Full-Penetration Welding In Situ TiB2 Particulate Reinforced ZL101 Composites

2010 ◽  
Vol 97-101 ◽  
pp. 3967-3973 ◽  
Author(s):  
Hai Chao Cui ◽  
Feng Gui Lu ◽  
Xin Hua Tang ◽  
Shun Yao
Keyword(s):  
High Resolution ◽  
Laser Power ◽  
Particle Distribution ◽  
Welding Process ◽  
Full Penetration ◽  
High Resolution Tem ◽  
Tib2 Particles ◽  
Particulate Reinforced ◽  
Al Matrix

Laser full-penetration welding of novel in situ TiB2 particulate reinforced ZL101 composites was studied using three different welding velocities synchronized with proper laser power. The optimal welding process parameters for laser full-penetration welding of in situ TiB2 reinforced ZL101 composites were suggested. The SEM results show that few pores and uniform particle distribution were obtained. TiB2 particles are intimately contacted with Al matrix according to the results of high-resolution TEM. There was no evidence of chemical reaction at the interface.

Structural changes of Au nanocones during in situ cold-field emission observed by high-resolution TEM

2016 ◽  
pp. 135-136
Author(s):  
Ludvig de Knoop ◽  
Norvik Voskanian ◽  
Andrew Yankovich ◽  
Kristof Lodewijks ◽  
Alexandre Dmitriev ◽  
...  
Keyword(s):  
High Resolution ◽  
Field Emission ◽  
Structural Changes ◽  
High Resolution Tem

In situ High Resolution TEM Observation of Solid-gas Reactions at High Temperatures

2007 ◽  
Vol 13 (S02) ◽  
Author(s):  
K Kishita ◽  
T Kamino ◽  
S Arai ◽  
K Kuroda ◽  
H Saka
Keyword(s):  
High Resolution ◽  
High Temperatures ◽  
High Resolution Tem ◽  
Gas Reactions
Sign in / Sign up

Export Citation Format

Share Document