Last edited by Dagul
Tuesday, July 28, 2020 | History

3 edition of The growth of metastable peritectic compounds found in the catalog.

The growth of metastable peritectic compounds

The growth of metastable peritectic compounds

  • 177 Want to read
  • 18 Currently reading

Published by The Center in Marshall Space Flight Center, Ala .
Written in English

    Subjects:
  • Solidification.,
  • Alloys.

  • Edition Notes

    Statementprepared by David J. Larson ; prepared for National Aeronautics and Space Administration, George C. Marshall Space Flight Center.
    SeriesNASA-CR -- 171290., NASA contractor report -- NASA CR-171290.
    ContributionsGeorge C. Marshall Space Flight Center., Grumman Aerospace Corporation. Research and Development Center. Materials & Structural Mechanics Directorate.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL17559330M

    @article{osti_, title = {Coupled growth of the properitectic {alpha}- and the peritectic {gamma}-phases in binary titanium aluminides}, author = {Busse, P and Meissen, F}, abstractNote = {Intermetallic compounds are interesting materials for structural, electro-magnetic, chemical or metallurgical applications. They often result from solidification via the peritectic reaction. The peritectic reaction consists in the growth of the peritectic solid phase along the metastable interface between the primary solid phase and the liquid : Yuying Wu.

    •x is a peritectic point (3 phases: A, AB, liquid x) •AB melts completely at T 3 •liquid compositions between x and m precipitate AB first Type 2: single compound AB that melts incongruently Peritectic point: an invariant point (liquid & two solids) in which the composition of the liquid phase is not between that of the two solids. Analysis and modelling. Mechanism of the intermetallic phase / compound growth on the substrate The peritectic reactions are accompanying the solidification process occurring after complete transformation of the liquid filler metal into its liquid solution. The solidification can be arrested and morphology frozen, Fig.

    Inkjet printing was used to deposit picoliter droplets of aqueous glycine solution onto glass or aluminum substrates and it was found that the volume constraint on crystal growth resulted in formation of the highly metastable β form. When the droplet volume increased to μL or greater, a mixture of the α and β forms was seen in a coffee-ring formation. When the droplet . Coupled growth during three phase equilibrium solidification is well known from directionally solidified eutectic systems, and was recently generated in monotectic systems. Several theories predict a stationary peritectic reaction and coupled growth of the properitectic and the peritectic phases therefore should be possible.


Share this book
You might also like
Revised regulations of Ontario, 1970

Revised regulations of Ontario, 1970

Special Reports on the Mineral Resources of Great Britain

Special Reports on the Mineral Resources of Great Britain

Law in UK universities, polytechnics and colleges

Law in UK universities, polytechnics and colleges

Evaluating Tmj Injuries

Evaluating Tmj Injuries

Christmas Every Day (Orelco & J-Card) Cassette

Christmas Every Day (Orelco & J-Card) Cassette

Dan Cassidys worldwide college scholarship directory

Dan Cassidys worldwide college scholarship directory

Overheard

Overheard

Interpersonal factors in research

Interpersonal factors in research

The misery of civil-war

The misery of civil-war

Puerto Rico

Puerto Rico

Outside Micklegate Bar

Outside Micklegate Bar

Quit-for-Life

Quit-for-Life

The growth of metastable peritectic compounds Download PDF EPUB FB2

Since the crystal growth mechanism was dendritic rather than cooperative, the assoicated permanent magnet properties were rather poor. Magnetization as a function of sample orientation indicates that the easy axis of magnetization was primarily along the direction of solidification for the eutectic Sm2Co17/Co and peritectic SmCo5/Sm2Co17 : R.

Pirich. Get this from a library. The growth of metastable peritectic compounds. [Ronald G Pirich; George C. Marshall Space Flight Center.; Grumman Aerospace Corporation.

Research and Development Center. Materials & Structural Mechanics Directorate.]. The growth of metastable peritectic compounds. By Jr. Larson. Abstract. The influence of gravitationally driven convection on the directional solidification of peritectic alloys was evaluated.

The Pb-Bi peritectic was studied as a model solidification system. Analyses of directionally solidified Pb-Bi peritectic samples indicate that Author: Jr. Larson. ON METASTABLE EUTECTIC REACTIONS IN PERITECTIC SYSTEMS: POSSIBLE APPLICATIONS TO Ti-A1 ALLOYS V.J.

Laraia and A.H. Heuer Department of Materials Science & Engineering Case Western Reserve University Cleveland, OH (Received October 4, ) Introduction We propose that metastable eutectic reactions can lead to coupled "eutectic-like" growth in a special class of peritectic Cited by: 7.

Homogeneous samples of peritectic semiconducting compounds have been prepared for optical and electrical characterization by combining zone leveling concepts with Bridgeman crystal growth techniques. Proper temperature distribution in the zone leveling equipment must be established on the basis of the phase diagram for the material, and by Cited by: The coupled and uncoupled growth of the stable compounds produces a regular lamellar eutectic structure and an anomalous eutectic structure, respectively.

The crystallization and solid-state decomposition of the metastable Co 5 Si 3 compound brings about a fine-grained two-phase mixture, which represents another type of anomalous eutectic by: 7. The path l–e is the most suitable for crystal growth.

p = peritectic reaction, e = eutectic reaction, m = melting reaction, p1 = equation (3), p2 = equation (4), e = equation (2) and m = equation (1). The inset shows phases existing in the pseudo-ternary phase diagram of YO -BaO-CuO at °C in air [after 59 ]. The NiZr peritectic alloy was undercooled by electromagnetic levitation method up to K.

The measured dendritic growth velocity shows a steep acceleration at a critical undercooling Cited by: 7. in post mortem analyses of peritectic alloys are isothermal peritectic coupled growth (PCG), cellular peritectic coupled growth, discrete bands, island bands, and oscillatory tree-like structures.

Trivedi suggested the first conceptual description of cyclic nucleation and growth under purely di usive conditions [14].Author: Johann P.

Mogeritsch, Mehran Abdi, Andreas Ludwig. Metastable state. Written By: Metastable state, in physics and chemistry, particular excited state of an atom, nucleus, or other system that has a longer lifetime than the ordinary excited states and that generally has a shorter lifetime than the lowest, often stable, energy state, called the ground state.

The peritectic transformation can never be accomplished completely in the droplets of any size, but facilitated by recalescence effect in small droplets.

A eutectic‐like lamellar structure caused by coupled growth of ε‐Zn 3 Ag and (Zn) phases has been observed in droplets smaller than µm. The metastable lamellar structure is inclined Author: C. Cao, J. Gao, B. Wei.

Quantitative XRD results show that the maximum proportion of metastable β-AlFeSi intermetallic phase is produced at relatively low growth velocities in the range of 30–60 mm/min.

Both DSC and XRD analysis confirm that at higher growth velocities, such as mm/min, the formation of α-AlFeSi phase by the eutectic reaction dominates the phase by: Further away from the chilled end, the pro-peritectic phase is found to be formed parallel to the growth direction (Figure 4), which is similar to the PCG morphology reported for Fe-Ni alloys.

Aberrant assembly of the amyloid-β (Aβ) is responsible for the development of Alzheimer’s disease, but can also be exploited to obtain highly functional biomaterials. The short Aβ fragment, KLVFF (Aβ16–20), is crucial for Aβ assembly and considered to be an Aβ aggregation inhibitor.

Here, we show that acetylation of KLVFF turns it into an extremely fast self-assembling Cited by: 3. The crystallisation of metastable drug polymorphs in polymer matrices has been reported as a successful approach to enhance the solubility of poorly water-soluble drug molecules.

This can be achieved using different polymers, drug to polymer ratios and formulation techniques enabling the formation of stable nuclei and subsequent growth of new or metastable drug : Maciej Nowak, Maciej Gajda, Przemysław Baranowski, Patrycja Szymczyk, Bożena Karolewicz, Karol P.

Catalogue of ferrous alloy specifications, commercial and service. [Ottawa: Canadian Arsenals Ltd]Catalogue of ferrous alloy specifications, commercial and service. Prepared at the request of the Dept.

of National Defence, Dominion of Canada. The growth of metastable peritectic compounds [microform] / prepared by David J. Larson. The metastable coupled-growth phenomenon perhaps occurs in the highly undercooled state for the alloy composition, which locates within the composition range of – at.% Ti.

Since Fe 59 Ti 41 alloy locates in thisCited by: Chemistry Edit. In chemical systems, a system of atoms or molecules involving a change in chemical bond can be in a metastable state, which lasts for a relatively long period of time.

Molecular vibrations and thermal motion make chemical species at the energetic equivalent of the top of a round hill very short-lived. The peritectic transformation can never be accomplished completely in the droplets of any size, but facilitated by recalescence effect in small droplets. A eutectic‐like lamellar structure caused by coupled growth of ε‐Zn 3 Ag and (Zn) phases has been observed in droplets smaller than µm.

The metastable lamellar structure is inclined Author: C. Cao, J. Gao, B. Wei. Iron carbides containing from 31 to 17 atomic % carbon, with cohenite XRD structure and optical properties, were grown in experiments in Fe–Ni–S–C, Fe–Ni–C, and in Fe–C at 1, 6, and 7 GPa.

X-ray cell volumes increase with C content. Compositions listed above vary considerably outside the nominal (Fe,Ni)3C stoichiometry of cohenite/ by:. Under pure diffusive growth conditions, layered peritectic solidification is possible.

In reality, the competitive growth of the primary α-phase and the peritectic β-phase revealed some complex peritectic solidification morphologies due to thermo-solutal convection. The binary organic components Tris-(hydroxylmenthyl) aminomethane-(Neopentylglycol) were used as a model .Growth of Si 1 − x Sn x alloys on Ge 1 − y Sn y-buffered Si() was achieved via reactions of Sn D 4 and Si H 3 Si H 2 Si H 3 at ° C.

Kinetic studies indicate that unprecedented low growth temperatures are made possible by the highly reactive Si H 2 by: texts All Books All Texts latest This Just In Smithsonian Libraries FEDLINK (US) Genealogy Lincoln Collection. National Emergency Library.

Top American Libraries Canadian Libraries Universal Library Community Texts Project Gutenberg Biodiversity Heritage Library Children's Library. Open Library.