3DXRD Characterization and Modeling of Solid-State Transformation Processes

MRS Bulletin ◽  
2008 ◽  
Vol 33 (6) ◽  
pp. 621-629 ◽  
Author(s):  
D. Juul Jensen ◽  
S.E. Offerman ◽  
J. Sietsma
Keyword(s):  
Solid State ◽  
Geometric Modeling ◽  
Three Dimensional ◽  
Dynamics Modeling ◽  
X Ray Diffraction ◽  
State Transformation ◽  
Solid State Transformation ◽  
Molecular Dynamics Modeling

AbstractThree-dimensional x-ray diffraction (3DXRD) allows nondestructive characterization of grains, orientations, and stresses in bulk microstructures and, therefore, enables in situ studies of the structural dynamics during processing. The method is described briefly, and its potential for providing new data valuable for validation of various models of microstructural evolution is discussed. Examples of 3DXRD measurements related to recrystallization and to solid-state phase transformations in metals are described. 3DXRD measurements have led to new modeling activity predicting the evolution of metallic microstructures with much more detail than hitherto possible. Among these modeling activities are three-dimensional (3D) geometric modeling, 3D molecular dynamics modeling, 3D phase-field modeling, two-dimensional (2D) cellular automata, and 2D Monte Carlo simulations.

In Situ High-Energy X-Ray Diffraction Studies of Melting, Solidification and Solid-State Transformation of Ni3Sn

MRS Advances ◽  
2020 ◽  
Vol 5 (29-30) ◽  
pp. 1529-1535 ◽  
Author(s):  
Rijie Zhao ◽  
Jianrong Gao ◽  
Yang Ren
Keyword(s):  
Solid State ◽  
Elevated Temperatures ◽  
High Energy ◽  
Cubic Phase ◽  
X Ray Diffraction ◽  
State Transformation ◽  
Solid State Transformation ◽  
X Ray ◽  
Melting And Solidification

AbstractMelting, solidification and solid-state transformation of the intermetallic Ni3Sn compound were investigated in situ using synchrotron high-energy X-ray diffraction. It was observed that the compound undergoes a hexagonal to cubic transition before melting. In solidification, a disordered cubic phase crystallizes from the liquid at a large undercooling but it is reordered prior to bulk solidification. In melting and solidification, forced or natural flows are active bringing about significant changes of crystal orientations. These in situ observations provided insights into phase transformations of Ni3Sn at elevated temperatures and their roles in formation of metastable microstructure consisting of coarse grains and subgrains.

A cyano and end-to-end azido bridged 3D copper(ii)–copper(i) mixed-valence coordination polymer and its transformation to copper nitride nanoparticles

RSC Advances ◽  
2014 ◽  
Vol 4 (64) ◽  
pp. 34110-34116 ◽  
Author(s):  
Manoj Trivedi ◽  
Gurmeet Singh ◽  
Abhinav Kumar ◽  
Nigam P. Rath
Keyword(s):  
Solid State ◽  
Coordination Polymer ◽  
Mixed Valence ◽  
Three Dimensional ◽  
State Transformation ◽  
Solid State Transformation ◽  
Copper Nitride ◽  
End To End

Syntheses and characterization of a CN and end-to-end N3 bridged three-dimensional Cu(II)–Cu(I) mixed valence polymer (1), with Cu-N3 system without CN (2) and a CN-bridged Cu analogue without N3 (3) are reported and solid-state transformation of the 1 to copper nitride nanoparticles performed.

The Effects of Cooling Rate Upon Xdt m TiAl Weld Microstructure

1990 ◽  
Vol 194 ◽  
Author(s):  
Erica Robertson ◽  
Mary Ann Hill ◽  
Ricardo B. Schwarz
Keyword(s):  
Solid State ◽  
Cooling Rate ◽  
Volume Fraction ◽  
Mechanical Test ◽  
Test System ◽  
X Ray Diffraction ◽  
State Transformation ◽  
Solid State Transformation ◽  
X Ray ◽  
Weld Microstructure

AbstractFusion zone microstructures of an electron beam (EB) welded XDt m Ti–48at%Al + 6.5 vol% TiB2 alloy revealed plate-like precipitates which were absent in the base metal. The volume fraction of this phase increased with increasing cooling rate and correlated with increased weld cracking frequency. To determine whether this phase was a product of solidification from the melt or a product of a solid-state transformation, the microstructures of the welds were compared to those of samples cycled in a Gleeble 1500/20 Thermal-Mechanical Test System which was programmed to simulate the solid-state portion of the weld cooling rates (as predicted by a Rosenthal analysis). The microstructures were characterized by X-ray diffraction, optical and by scanning electron microscopy. The plate-like phase found in the weld microstructures was identified as TiB2 occurring upon rapid solidification of the melted weld metal.

Observation and characterization of a twinned monoclinic phase as a product of the solid state decomposition of Nd2Fe14B

1992 ◽  
Vol 7 (7) ◽  
pp. 1762-1768 ◽  
Author(s):  
L. Rabenberg ◽  
Josef Fidler ◽  
Johannes Bernardi
Keyword(s):  
Solid State ◽  
Monoclinic Phase ◽  
Permanent Magnets ◽  
State Transformation ◽  
Solid State Transformation ◽  
Solid State Decomposition ◽  
Unit Cells ◽  
Solid State Phase Transformation ◽  
Small Shear

A microtwinned monoclinic phase is observed to occur within the grains of the hard magnetic phase in Nd2Fe14B-based permanent magnet alloys. This phase seems to be the product of a displacive solid state phase transformation of tetragonal Nd2Fe14B, distinguished from Nd2Fe14B by the presence of an ordered substitution into alternating unit cells parallel to the crystallographic c-axis and by a small shear of the type 〈100〉 {011}. The four different orientational variants of this monoclinic phase with respect to the parent tetragonal phase are arranged into two distinct colonies of twin-related plates. The observation that Nd2Fe14B can undergo a displacive solid state transformation has broad implications for the entire field of Nd2Fe14B permanent magnets.

scholarly journals Rapid-Heating-Triggered in Situ Solid-State Transformation of Amorphous TiO2 Nanotubes into Well-Defined Anatase Nanocrystals

2018 ◽  
Vol 19 (2) ◽  
pp. 1086-1094 ◽  
Author(s):  
Zhonghui Gao ◽  
Ying Zhao ◽  
Haifeng Wang ◽  
Yun Wang ◽  
Lixue Jiang ◽  
...  
Keyword(s):  
Solid State ◽  
Tio2 Nanotubes ◽  
Rapid Heating ◽  
State Transformation ◽  
Solid State Transformation ◽  
Amorphous Tio2

Solid-state transformation of aqueous to organic electrolyte – Enhancing the operating voltage window of ‘in situ electrolyte’ supercapacitors

2020 ◽  
Vol 4 (5) ◽  
pp. 2438-2447
Author(s):  
Desirée Leistenschneider ◽  
Lars Henning Heß ◽  
Andrea Balducci ◽  
Lars Borchardt
Keyword(s):  
Solid State ◽  
Organic Electrolyte ◽  
Operating Voltage ◽  
State Transformation ◽  
Solid State Transformation ◽  
Organic Electrolytes ◽  
Waste Products ◽  
Supercapacitor Applications

Waste products during carbon synthesis are transformed into organic electrolytes for supercapacitor applications.

Sign in / Sign up

Export Citation Format

Share Document