scholarly journals Effect of La Addition on Solidification Behavior and Phase Composition of Cast Al-Mg-Si Alloy

Metals ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1673
Author(s):  
Vladislav Deev ◽  
Evgeny Prusov ◽  
Pavel Shurkin ◽  
Ernst Ri ◽  
Svetlana Smetanyuk ◽  
...  
Keyword(s):  
Phase Composition ◽  
Phase Region ◽  
Solidification Path ◽  
Calphad Approach ◽  
State Transformation ◽  
Solid State Transformation ◽  
Rich Phase ◽  
Mg2si Phase ◽  
Microscopy Technique ◽  
Calculated Fraction

The current study focusses on the phase composition, solidification path, and microstructure evaluation of gravity cast Al-4Mg-0.5Si-xLa aluminum alloy, where x = 0, 0.1, 0.25, 0.5, 0.75, and 1 wt.% La. A computational CalPhaD approach implemented in Thermo-Calc software and scanning electron microscopy technique equipped with electron microprobe analysis (EMPA) was employed to assess its above-mentioned characteristics. The thermodynamic analysis showed that the equilibrium solidification path of La-containing Al-Mg-Si alloys consists of only binary phases LaSi2 and Mg2Si precipitation along with α-Al from the liquid and further solid-state transformation of this mixture into α-Al + Al11La3 + Mg2Si + Al3Mg2 composition. Scheil–Gulliver simulation showed a similar solidification pathway but was accompanied by an increase in the solidification range (from ~55 °C to 210 °C). Furthermore, microstructural observations were congruent with the calculated fraction of phases at 560 °C and related to α-Al + LaSi2 + Mg2Si three-phase region in terms of formation of La-rich phase having both eliminating effect on the eutectic Mg2Si phase. Quantitative EMPA analysis and elemental mapping revealed that the La-rich phase included Al, La, and Si and may be described as Al2LaSi2 phase. This phase shows a visible modifying effect on the eutectic Mg2Si phase, likely due to absorbing on the liquid/solid interface.

Solid-state Transformation of Achiral Crystals to a Chiral Crystal by Guest Release from Host–Guest Inclusion Crystals of Achiral Host Compound

2009 ◽  
Vol 38 (11) ◽  
pp. 1080-1081 ◽  
Author(s):  
Hironori Saito ◽  
Mitsuaki Suzuki ◽  
Hiroshi Miyamae ◽  
Naoto Hayashi ◽  
Keiji Kobayashi
Keyword(s):  
Solid State ◽  
State Transformation ◽  
Solid State Transformation ◽  
Host Compound

scholarly journals Maskelynite formation via solid-state transformation: Evidence of infrared and X-ray anisotropy

2015 ◽  
Vol 120 (3) ◽  
pp. 570-587 ◽  
Author(s):  
Steven J. Jaret ◽  
William R. Woerner ◽  
Brian L. Phillips ◽  
Lars Ehm ◽  
Hanna Nekvasil ◽  
...  
Keyword(s):  
Solid State ◽  
State Transformation ◽  
Solid State Transformation ◽  
X Ray

Solid-State Reactions in Multilayer Ni/Ti Thin Film Composites

1990 ◽  
Vol 205 ◽  
Author(s):  
Gillian E. Winters ◽  
K.M. Unruh ◽  
C.P. Swann ◽  
M.E. Patt ◽  
B.E. White ◽  
...  
Keyword(s):  
Solid State ◽  
Solid State Reactions ◽  
Metastable Solid Solution ◽  
State Transformation ◽  
Solid State Transformation ◽  
Scanning Calorimetry ◽  
The Individual ◽  
Thin Film Composites ◽  
Film Composites ◽  
Rf Sputter Deposition

AbstractMultilayer films, consisting of alternating layers of crystalline Ni and Ti, have been prepared by RF sputter deposition over a range of modulation wavelengths corresponding to an overall composition of Ni50Ti50. These films have been characterized by xray diffraction and Rutherford backscattering measurements. The solid-state transformation by interdiffusional mixing of the individual layers has been directly studied by differential scanning calorimetry and correlated with structural measurements. These measurements indicate that the solid-state reaction of Ni and Ti multilayers proceeds through the formation of a metastable solid solution of Ti in Ni followed by the formation of intermetallic equilibrium compounds. No direct calorimetric or structural evidence for the formation of an amorphous Ni-Ti phase has been found in these samples.

Self-assembled ZnO-rGO nanocomposite, a solid-state transformation to control its crystallite size

2021 ◽  
pp. 159992
Author(s):  
Germán Pérez-Zúñiga ◽  
Gabriel Herrera-Pérez ◽  
Ysmael Verde-Gómez ◽  
Ana María Valenzuela-Muñiz
Keyword(s):  
Solid State ◽  
Crystallite Size ◽  
State Transformation ◽  
Solid State Transformation ◽  
Self Assembled

Jadeite and its relatives: fake news or a real tool to constrain shock conditions?

2021 ◽  
Author(s):  
Ioannis Baziotis ◽  
Stamatios Xydous ◽  
Angeliki Papoutsa ◽  
Jinping Hu ◽  
Chi Ma ◽  
...  
Keyword(s):  
First Principles ◽  
Chemical Space ◽  
Formula Unit ◽  
First Principles Calculations ◽  
Fake News ◽  
State Transformation ◽  
Solid State Transformation ◽  
Crater Diameter ◽  
Grain Sizes ◽  
New Occurrences

Abstract Jadeite is frequently reported in shocked meteorites, displaying a variety of textures and grain sizes that suggest formation by either solid-state transformation or by crystallization from a melt. Sometimes, jadeite has been identified solely on the basis of Raman spectra. Here we argue that additional characterization is needed to confidently identify jadeite and distinguish it from related species. Based on chemical and spectral analysis of three new occurrences, complemented by first-principles calculations, we show that related pyroxenes in the chemical space (Na)M2(Al)M1(Si2)TO6 – (Ca)M2(Al)M1(AlSi)TO6 – (□)M2(Si)M1(Si2)TO6 with up to 2.25 atoms Si per formula unit have spectral features similar to jadeite. However, their distinct stability fields and synthesis pathways, considered together with textural constraints, have specific implications for precursor phases and estimates of impactor size, encounter velocity, and crater diameter. A reassessment of reported jadeite occurrences puts in a new light many previous conclusions about the shock histories preserved in particular meteorites.

Two solvent-dependent manganese(ii) supramolecular isomers: solid-state transformation and magnetic properties

CrystEngComm ◽  
2013 ◽  
Vol 15 (27) ◽  
pp. 5412 ◽  
Author(s):  
Wen-Wen Dong ◽  
Dong-Sheng Li ◽  
Jun Zhao ◽  
Lu-Fang Ma ◽  
Ya-Pan Wu ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Solid State ◽  
State Transformation ◽  
Solid State Transformation
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