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calcium aluminum inclusions

Calcium-aluminum-rich inclusions with - …

Calcium-aluminum-rich inclusions with fractionation and unknown nuclear effects (FUN CAIs): I. Mineralogy, petrology, and oxygen isotopic compositions. Author links open overlay panel Alexander N. Krot a Kazuhide Nagashima a Gerald J. Wasserburg a b Gary R. Huss a Dimitri Papanastassiou b c Andrew M. Davis d Ian D. Hutcheon e Martin Bizzarro f.

Calcium‐aluminum‐rich inclusions in enstatite …

Abstract— Like calcium‐aluminum‐rich inclusions (CAIs) from carbonaceous and ordinary chondrites, enstatite chondrite CAIs are composed of refractory minerals such as spinel, perovskite, Al, Ti‐diopside, melilite, hibonite, and anorthitic plagioclase, which may be partially to completely surrounded by halos of Na‐(±Cl)‐rich minerals. . Porous, aggregate, and compact textures of

Calcium-aluminum-rich inclusions in enstatite …

Abstract— Like calcium-aluminum-rich inclusions (CAIs) from carbonaceous and ordinary chondrites, enstatite chondrite CAIs are composed of refractory minerals such as spinel, perovskite, Al, Ti-diopside, melilite, hibonite, and anorthitic plagioclase, which may be partially to completely surrounded by halos of Na-(±Cl)-rich minerals. Porous

THE INCLUSION STUDY AND THE DETERMINATION OF …

2017-10-20 · Figures 4 and 5 shows metallographic images of the disposition of calcium aluminate inclusions in samples studied, as well as inclusions: globular (Fig.4) and irregular (Fig.5). Distribution of nuer of inclusions of aluminum, calcium and calcium aluminate samples fuselage and support rods, is presented in Fig. 6 diagram. 0 5 10 15 20

The formation of rims on calcium-aluminum-rich …

Wark-Lovering rims of six calcium-aluminum-rich inclusions (CAIs) representing the main CAI types and groups in Allende, Efremovka and Vigarano were microsurgically separated and analysed by neutron activation analysis (NAA).

Searching for calcium‐aluminum‐rich inclusions in …

The calcium‐aluminum‐rich inclusions (CAIs) found in chondritic meteorites are probably the oldest solar system solids, dating back to 4567.30 ± 0.16 million years ago. They are thought to have formed in the protosolar nebula within a few astronomical units of the Sun, and at a temperature of around 1300 K.

Searching for calcium‐aluminum‐rich inclusions in …

The calcium‐aluminum‐rich inclusions (CAIs) found in chondritic meteorites are probably the oldest solar system solids, dating back to 4567.30 ± 0.16 million years ago. They are thought to have formed in the protosolar nebula within a few astronomical units of the Sun, and at a temperature of around 1300 K.

Formation and evolution of Spinel in aluminum killed

2018-12-29 · FORMATION AND EVOLUTION OF SPINEL IN ALUMINUM KILLED CALCIUM TREATED LINEPIPE STEELS by OBINNA M. ADABA A THESIS Presented to Graduate Faculty of the MISSOURI UNIVERSITY OF SCIENCE AND TECHNOLOGY In Partial Fulfillment of the Requirements for the Degree MASTER OF SCIENCE IN METALLURGICAL ENGINEERING 2015 Approved by Ronald J. …

Calcium-Aluminum-rich Inclusions (CAI''s) - Amethyst …

Calcium-Aluminum-rich Inclusions (or CAI''s) are the light-colored inclusions common in carbonaceous chondrites.Like chondrules, CAI''s are composed of refractory minerals, but there are several significant differences.As their name indies, they are rich in calcium and aluminum minerals, and they are also quite poor in iron.

Tellurium isotope compositions of calcium-aluminum-rich

Tellurium isotope compositions of calcium-aluminum-rich inclusions 973 Measurements with Faraday Collectors Samples that contained more than ~100 pg Te were measured by static multiple collection using Faraday collectors with procedures similar to those described by Fehr and co-workers (Fehr et al. 2004, 2006). Data acquisition for

Effect of Calcium Treatment on Non-Metallic Inclusions in

Effect of Calcium Treatment on Non-Metallic Inclusions in Ultra-Low Oxygen Steel,:

Calcium-Aluminum-rich Inclusions in Chondritic …

Calcium-aluminum-rich inclusions (CAIs) are submillimeter- to centimeter-sized clasts in chondritic meteorites, whose ceramic-like chemistry and mineralogy set them apart from other chondrite components. Since their first descriptions more than 30 years ago (e.g., Christophe Michel-Lévy, 1968), they have been the objects of a vast amount of study.

Calcium–aluminium-rich inclusion - Wikipedia

2019-4-23 · A calcium–aluminium-rich inclusion or Ca–Al-rich inclusion (CAI) is a submillimeter- to centimeter-sized light-colored calcium- and aluminium-rich inclusion found in carbonaceous chondrite meteorites.They are probably the oldest substances in the Solar System. The oldest age was measured in an inclusion of the CV3 carbonaceous chondrite Northwest Africa (NWA) 2364 and was dated at …

Chronology of the early Solar System from chondrule

Chronology of the early Solar System from chondrule-bearing calcium-aluminium-rich inclusions. A. A. Lead isotopic ages of chondrules and calcium-aluminum-rich inclusions. Science 297, 1678

Calcium Modifiion of Spinel Inclusions in Aluminum-Killed

2015-1-27 · Calcium Modi?ion of Spinel Inclusions in Aluminum-Killed Steel: Reaction Steps NEERAV VERMA, PETRUS C. PISTORIUS, RICHARD J. FRUEHAN

(PDF) Characteristics of Spinel Inclusions Formed After

1 Technical Article Characteristics of Spinel Inclusions Formed After Reoxidation of Calcium-Treated Aluminum-Killed Steel A thermodynamic model was developed and a laboratory vacuum induction furnace R eoxidation of liquid steel during the last stages of steel produc- tion affects the inclusion charac- inclusions were modified by calcium to liquid calcium-magnesium alumi- nates.

High-temperature rims around calcium–aluminum …

Calcium–aluminum-rich inclusions (CAIs) are a minor, but important refractory component of chondritic meteorites: they are the oldest solids formed in the Solar System (Connelly et al., 2012), and, therefore, could have preserved important records of the processes, physico-chemical conditions, and isotopic variations in their formation region(s).

CAI - calcium-aluminum-rich inclusion | AcronymAttic

Mineralogical map of a calcium-aluminum-rich inclusion (CAI) in the Efremovka carbonaceous chondrite. In this image, obtained with an electron microprobe, the square and diamond-shaped, purplish grains are spinel, an aluminum-rich mineral. The light-green and green areas are crystals of minerals rich in both calcium and aluminum.

CALCIUM-ALUMINUM-RICH INCLUSIONS (CAIs)

1999-11-2 · Relic Ca,Al-rich Inclusions in Chondrules from the Carbonaceous Chondrites Acfer 182 and Acfer 094 [#1511] We describe the discovery of two relic CAIs inside chondrules. The relic CAIs and host chondrules contain phases, plagioclase and hibonite, suitable for Al-Mg isotopic study, and may provide information on the time

MECHANISM AND KINETICS OF TRANSFORMATION OF …

2006-8-31 · MECHANISM AND KINETICS OF TRANSFORMATION OF ALUMINA INCLUSIONS IN STEEL BY CALCIUM TREATMENT Minna Lind Dissertation for the degree of Doctor of Science in Technology to be presented with due permission of the Department of Materials Science and Engineering, Helsinki

Calcium-Aluminium-reiche Einschlüsse – Wikipedia

2019-4-17 · Calcium-Aluminium-reiche Einschlüsse (abgekürzt „CAI“ von engl. Ca-Al-rich Inclusions) sind mikrometer- bis zentimetergroße hellfarbige Einschlüsse, die in vielen chondritischen Meteoriten, vor allem in kohligen Chondriten, vorkommen. Darüber hinaus wurden CAI- ähnliche Fragmente in Proben des Kometen Wild 2 gefunden, die die

Calcium-Aluminium-reiche Einschlüsse – Wikipedia

2019-4-17 · Calcium-Aluminium-reiche Einschlüsse (abgekürzt „CAI“ von engl. Ca-Al-rich Inclusions) sind mikrometer- bis zentimetergroße hellfarbige Einschlüsse, die in vielen chondritischen Meteoriten, vor allem in kohligen Chondriten, vorkommen. Darüber hinaus wurden CAI- ähnliche Fragmente in Proben des Kometen Wild 2 gefunden, die die

A Study on Calcium Transfer from Slag to - …

Abstract. Aluminum deoxidized steel tends to form solid inclusions (alumina, spinel, partially modified calcium aluminates). These solid inclusions are known to present challenges during casting, cause slivers during mechanical working and act as crack initiation sites for mechanical failure.

A Study on Calcium Transfer from Slag to - …

Abstract. Aluminum deoxidized steel tends to form solid inclusions (alumina, spinel, partially modified calcium aluminates). These solid inclusions are known to present challenges during casting, cause slivers during mechanical working and act as crack initiation sites for mechanical failure.

Aluminum-26 in calcium-aluminum-rich inclusions …

Aluminum-26 in calcium-aluminum-rich inclusions and chondrules from unequilibrated ordinary chondrites WASSERBURG, G. J., RUSSELL, S. S. and SRINIVASAN, G. (2001), Aluminum-26 in calcium-aluminum-rich inclusions and chondrules from unequilibrated ordinary chondrites. Krot A. N. and Keil K. (2000) Calcium-aluminum-rich inclusions in

Inclusion minérale riche en calcium et en aluminium

2019-4-24 · Les inclusions minérales riches en calcium et en aluminium, en anglais calcium-aluminium-rich inclusions ou Ca-Al-rich Inclusions (CAI), sont des enclaves[a] réfractaires de taille submillimétrique à centimétrique, formées essentiellement de minéraux notablement riches en calcium et en aluminium, qu''on trouve dans les météorites du

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