Reaction of molten Al and of Al-20 wt. % U with water vapour

Robertson, Alan J.; Rostron, A.J.

doi:10.1016/0010-938x(65)90002-8

Cited by 5 publications

(6 citation statements)

References 21 publications

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“…Oxidation of aluminum alloys is dependent on oxidation time and temperature, alloying elements, and water vapor in oxidizing atmosphere . Therefore, in this study, an aluminum alloy containing 4 wt.% magnesium, which previously showed the possibility of the enhanced heterogeneous nucleation of aluminum grains, was used to minimize the effect of other alloying elements.…”

Section: Methodsmentioning

confidence: 99%

Formation of endogenous MgO and MgAl₂O₄particles and their possibility of acting as substrate for heterogeneous nucleation of aluminum grains

Kim

2015

Surf. Interface Anal.

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Aluminum containing 4 wt.% magnesium was oxidized at a temperature for different oxidation times and analyzed by highresolution electron microscopy. A thin oxidized layer of about 5 μm, which is composed of MgO, forms at short oxidation time and gradually increases. High-resolution microstructures reveal that the oxidized layers are porous regardless of oxidation time. After extended oxidation time, discrete MgAl 2 O 4 particles formed as a result of the reaction of initially formed MgO, liquid aluminum, and oxygen introduced from air through the porous MgO. Furthermore, it is clear by high-resolution lattice images that MgAl 2 O 4 particles are covered with thin Al 2 O 3 , whereas MgO is bonded intimately to aluminum. Therefore, MgAl 2 O 4 particles that form naturally during oxidation are difficult to act as a direct substrate for nucleation of aluminum grains because of the coverage of Al 2 O 3 . In contrast, MgO shows the possibility of acting as a substrate for the aluminum nucleation. The formation mechanism of MgO and MgAl 2 O 4 and their possibility of acting as substrates for nucleation of aluminum grains suggest that atomic level bonding and mismatches of nucleant/nucleus metal should be considered for correct evaluation of the possibility of heterogeneous nucleation of metallic matrix on a potent nucleant.

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Section: Methodsmentioning

confidence: 99%

Formation of endogenous MgO and MgAl₂O₄particles and their possibility of acting as substrate for heterogeneous nucleation of aluminum grains

Kim

2015

Surf. Interface Anal.

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“…Improved thermal conductivity was observed after heat treatment at 620°C for 5 d, which was most pronounced for samples containing 21 wt % uranium. The corrosion experiments [74]. aluminium -UAl 4 eutectic in the as-cast condition.…”

Section: Thermal Conductivitymentioning

confidence: 99%

“…While the compound with x = 0.8 exhibits behavior similar to USn3' the compound with x = 0.6 undergoes a steep decrease of CIT at low values of T2 (T < 25 K) [53,54,60,74]. While the compound with x = 0.8 exhibits behavior similar to USn3' the compound with x = 0.6 undergoes a steep decrease of CIT at low values of T2 (T < 25 K) [53,54,60,74].…”

Section: U-sn-inmentioning

confidence: 99%

“…The low-temperature magnetic susceptibility is similarly influenced by the composition of the ternary compound [53,54,74]. The composition U(lno.4Sno.sh shows the largest difference from the behavior of the two binary compounds with a characteristically large decrease of 'X with temperature at T < 50 K. The sharp maximum of X at x = 0.6 h:(O) -450 memu/mol) is also described in [60].…”

Section: U-sn-inmentioning

confidence: 99%

“…The Neel temperature ofthis ternary system decreases as X approaches zero at x -0.4 [45,48,60]. The low·temperature electronic specific heat coefficient y (at T = 1.35 K) exhibits a sharp maximum at x = 0.6 [45,48,60,74]. This behavior indicates magnetic ordering for compositions with x < 0.45 [54].…”

Section: U-sn-inmentioning

confidence: 99%

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U Uranium

Borgstedt¹,

Wedemeyer²

1989

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This work is subject to copyright. ALL rights are reserved, whether the whoLe or part of the materiaL is concerned, specifically those of translation, reprinting, reuse of illustrations, broadcasting, reproduction by photocopying machine or similar means, and storage in data banks. Under §54 of the German Copyright Law where copies are made for other than private use, a fee is payabLe to "VerwertungsgeseLLschafl Wort", Munich. © by Springer-VerLag Berlin HeideLberg 1989 Originally published by Springer-Verlag Berlin Heidelberg New York in 1989. Softcover reprint ofthe hardcover 8th edition 1989The use of registered names, trademarks, etc., in this publication does not impLy, even in the absence of a specific statement, that such names are exempt from the reLevant protective laws and regulations and therefore free for general use. PrefaceThe present voLume describes the alloys and the intermetaLLic compounds of uranium with the main group metaLs -those systems with semimetaLs such as boron and germanium are to be found in corresponding voLumes in uranium C series. In this voLume, main emphasis is given to the binary systems. Ternary systems are onLy deaLt with if there is formation of specific compounds or if there are other important characteristics or reactions. In generaL, the influence of small quantities of a third metaL on a system U-M, e.g., for mechanicaL properties or corrosion effects wiLL not be discussed in order not to extend this voLume excessiveLy.The ternary alloys are described immediateLy after the reLated binary systems. E. g., U-Ga-Ni is found after U-Ga, unLess a pLace after U-Ni couLd be imaginabLe from more systematic reasons (system of the Last position). The preferred order is aLso indicated in the sequence of eLement symboLs within the formuLas of compounds and systems: The compounds/systems reLated to U -AL are written as U -AL -M, etc.The behavior of uranium metaL towards the main group metaLs can be divided into two groups:Practically no soLubility in each other and no compound formation. This is the case for the aLkali and aLkaLine earth systems (except beryllium).OccasionaL formation of severaL compounds with Limited or extensive solid soLubility. This is observed for beryllium and the metaLs of third and fourth main group.The most frequently investigated systems are uranium -beryllium and uranium -aLuminium because of their speciaL scientific (U-Be) and technoLogicaL (U-AL) importance. UBe13, the onLy compound in the binary U -Be system, is one of the very few heavy-fermion compounds. Therefore, its physicaL properties especially were extensiveLy and thoroughLy studied in recent years. This GmeLin voLume gives a compLete and very detailed description of this compound, and at the time of publication, the most updated one.On the other hand, cermets and alloys in the U-AL system are very important as fueL, especially for the high-neutron-fLux nucLear research reactors. This fueL is mainLy based on 235U-enriched uranium on the aLuminium-rich side of the U -AL system, e. g., as UAL 4 ...

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Coloration of molten aluminium surface in various atmospheres

Sata

1994

JOURNAL OF MATERIALS SCIENCE

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Reaction of molten Al and of Al-20 wt. % U with water vapour

Cited by 5 publications

References 21 publications

Formation of endogenous MgO and MgAl₂O₄particles and their possibility of acting as substrate for heterogeneous nucleation of aluminum grains

Formation of endogenous MgO and MgAl₂O₄particles and their possibility of acting as substrate for heterogeneous nucleation of aluminum grains

U Uranium

Coloration of molten aluminium surface in various atmospheres

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Reaction of molten Al and of Al-20 wt. % U with water vapour

Cited by 5 publications

References 21 publications

Formation of endogenous MgO and MgAl2O4particles and their possibility of acting as substrate for heterogeneous nucleation of aluminum grains

Formation of endogenous MgO and MgAl2O4particles and their possibility of acting as substrate for heterogeneous nucleation of aluminum grains

U Uranium

Coloration of molten aluminium surface in various atmospheres

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Formation of endogenous MgO and MgAl₂O₄particles and their possibility of acting as substrate for heterogeneous nucleation of aluminum grains

Formation of endogenous MgO and MgAl₂O₄particles and their possibility of acting as substrate for heterogeneous nucleation of aluminum grains