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Magnesium Cermets and Magnesium-Beryllium Alloys; Cermets au magnesium et au magnesium-beryllium; Metallokeramicheskie magnievye i magnievo-berillievye splavy; Cermets de magnesio y aleaciones de magnesio y berillio

Conference:

Abstract

The paper describes some results of work on the development of magnesium-magnesium oxide cermets and of super heat-resistant magnesiumberyllium alloys produced by powder metallurgical methods. The introduction of even a minute quantity of finely dispersed magnesium oxide into magnesium results in a strengthening of the material, the degree of which increases with increased magnesium oxide concentration, although variation of this concentration within the limits of 0.3 to 5 wt.% has a comparatively slight effect on the corresponding variation in the short-term strength over the whole range of temperatures investigated. At 20{sup o}C, in the case of the cermets, {sigma}{sub {beta}} = 28 to 31 kg/mm{sup 2} and {delta} = 3 .5 to 4.5%; at 500{sup o}C {sigma}{sub {beta}} = 2.6 to 3.2 kg/mm{sup 2} and {delta} =30 to 40%. The positive effect of the finely dispersed oxide phase is particularly evident in protracted tests. For magnesium cermets, {sigma} (300)/100 = 2.2 kg/mm{sup 2}. Characteristic of the mixtures is the high thermal stability of the strength properties, linked chiefly with the thermodynamic stability of the strength-giving oxide phase in the metal matrix. The use of powder metallurgical methods has yielded super heat-resistant magnesium-beryllium alloys containing heightened concentrations of beryllium (PMB alloys).  More>>
Authors:
Ivanov, V. E.; Zelenskij, V. F.; Fajfer, S. I.; Zhdanov, S. M.; Maksimenko, V. I.; Savchenko, V. I. [1] 
  1. Fiziko-Tekhnicheskij Institut an USSR, Khar'kov, SSSR (Russian Federation)
Publication Date:
Nov 15, 1963
Product Type:
Conference
Resource Relation:
Conference: Conference on New Nuclear Materials Technology, Including Non Metallic Fuel Elements, Prague (Czech Republic), 1-5 Jul 1963; Other Information: 13 figs., 1 tab., 8 refs.; Related Information: In: New Nuclear Materials Including Non Metallic Fuel Elements. Vol. II. Proceedings of the Conference on New Nuclear Materials Technology, Including Non Metallic Fuel Elements| 586 p.
Subject:
36 MATERIALS SCIENCE; BERYLLIUM; BERYLLIUM ALLOYS; CERMETS; HEAT; MAGNESIUM; MAGNESIUM ALLOYS; MAGNESIUM OXIDES; MIXTURES; OXIDATION; POWDER METALLURGY; STABILITY
OSTI ID:
22109686
Research Organizations:
International Atomic Energy Agency, Vienna (Austria)
Country of Origin:
IAEA
Language:
Russian
Other Identifying Numbers:
Other: ISSN 0074-1884; TRN: XA13R0473067331
Submitting Site:
INIS
Size:
page(s) 183-198
Announcement Date:
Jul 04, 2013

Conference:

Citation Formats

Ivanov, V. E., Zelenskij, V. F., Fajfer, S. I., Zhdanov, S. M., Maksimenko, V. I., and Savchenko, V. I. Magnesium Cermets and Magnesium-Beryllium Alloys; Cermets au magnesium et au magnesium-beryllium; Metallokeramicheskie magnievye i magnievo-berillievye splavy; Cermets de magnesio y aleaciones de magnesio y berillio. IAEA: N. p., 1963. Web.
Ivanov, V. E., Zelenskij, V. F., Fajfer, S. I., Zhdanov, S. M., Maksimenko, V. I., & Savchenko, V. I. Magnesium Cermets and Magnesium-Beryllium Alloys; Cermets au magnesium et au magnesium-beryllium; Metallokeramicheskie magnievye i magnievo-berillievye splavy; Cermets de magnesio y aleaciones de magnesio y berillio. IAEA.
Ivanov, V. E., Zelenskij, V. F., Fajfer, S. I., Zhdanov, S. M., Maksimenko, V. I., and Savchenko, V. I. 1963. "Magnesium Cermets and Magnesium-Beryllium Alloys; Cermets au magnesium et au magnesium-beryllium; Metallokeramicheskie magnievye i magnievo-berillievye splavy; Cermets de magnesio y aleaciones de magnesio y berillio." IAEA.
@misc{etde_22109686,
title = {Magnesium Cermets and Magnesium-Beryllium Alloys; Cermets au magnesium et au magnesium-beryllium; Metallokeramicheskie magnievye i magnievo-berillievye splavy; Cermets de magnesio y aleaciones de magnesio y berillio}
author = {Ivanov, V. E., Zelenskij, V. F., Fajfer, S. I., Zhdanov, S. M., Maksimenko, V. I., and Savchenko, V. I.}
abstractNote = {The paper describes some results of work on the development of magnesium-magnesium oxide cermets and of super heat-resistant magnesiumberyllium alloys produced by powder metallurgical methods. The introduction of even a minute quantity of finely dispersed magnesium oxide into magnesium results in a strengthening of the material, the degree of which increases with increased magnesium oxide concentration, although variation of this concentration within the limits of 0.3 to 5 wt.% has a comparatively slight effect on the corresponding variation in the short-term strength over the whole range of temperatures investigated. At 20{sup o}C, in the case of the cermets, {sigma}{sub {beta}} = 28 to 31 kg/mm{sup 2} and {delta} = 3 .5 to 4.5%; at 500{sup o}C {sigma}{sub {beta}} = 2.6 to 3.2 kg/mm{sup 2} and {delta} =30 to 40%. The positive effect of the finely dispersed oxide phase is particularly evident in protracted tests. For magnesium cermets, {sigma} (300)/100 = 2.2 kg/mm{sup 2}. Characteristic of the mixtures is the high thermal stability of the strength properties, linked chiefly with the thermodynamic stability of the strength-giving oxide phase in the metal matrix. The use of powder metallurgical methods has yielded super heat-resistant magnesium-beryllium alloys containing heightened concentrations of beryllium (PMB alloys). In their strength characteristics PMB alloys are close to Mg-MgO cermets, but the magnesium-beryllium alloys have a degree and duration of resistance to high temperature oxidation which exceeds the corresponding qualities of the magnesium alloys at present known. Thus, in air of 580{sup o}C, PMB alloys with 2 to 5% beryllium maintain a high resistance to oxidation for a period of over 12000 to 14000 h. This long-term heat resistance is chiefly a result of the amount of beryllium in the alloy, and increases with increasing beryllium content. PMB alloys are also marked by high resistance to short bursts of overheating. Magnesium cermets and magnesium-beryllium alloys, with their enhanced high-temperature stability, are capable of finding extensive application in various branches of technology. (author) [French] Le memoire expose certains resultats relatifs au traitement des cermets au magnesium et oxyde de magnesium, ainsi que des alliages de magnesiumberyllium particulierement resistants a la chaleur, qui ont ete obtenus par les methodes de la metallurgie des poudres. Il suffit d'ajouter une quantite insignifiante d'oxyde de magnesium finement disperse pour accroitre la resistance a l'usure, laquelle augmente en fraction de cette quantite; il est vrai qu'en faisant varier la concentration de l'oxyde entre 0,3 et 5% en poids, on ne modifie que relativement peu la resistance maximum a court terme pour toute la gamme des temperatures considerees. Pour les cermets, on constate qu'a 20{sup o}C, {sigma}{sub {beta}} = 28 a 31 kg/mm{sup 2} et {delta} = 3,5 a 4,5%, tandis qu'a 500{sup o}C, {sigma}{sub {beta}} = 2,6 a 3,2 kg/mm{sup 2} et {delta} = 30 a 40%. L'effet positif de l'oxyde finement disperse se fait sentir surtout pendant les essais prolonges. Pour les cermets au magnesium, on trouve {sigma} (300)/100 = 2,2 kg/mm{sup 2}. Les cermets se caracterisent par la stabilite de leurs proprietes de resistance aux temperatures elevees, phenomene qui est lie avant tout a la stabilite thermodynamique de la phase oxyde. Grace aux methodes de la metallurgie des poudres, on a pu obtenir des alliages de magnesium-beryllium a forte concentration de beryllium, qui sont particulierement resistants a la chaleur (alliages PMB). D'apres leurs caracteristiques de resistance, les alliages PMB se rapprochent des cermets Mg-MgO; cependant, les alliages de magnesium-beryllium se distinguent par la stabilite et la duree de leur resistance a l'oxydation aux temperatures elevees, resistance qui est superieure a ce l le des cermets Mg-MgO actueUement connus. Ainsi, dans l'air, les alliages PMB contenant 2 a 5% de beryllium conservent a 580{sup o}C une forte resistance a l'oxydation pendant plus de 12 000 a 14000 heures. La duree de leur resistance a la chaleur est determinee avant tout par leur teneur en beryllium et augmente avec celle-ci. Les alliages PMB se distinguent egalement par leur forte resistance a une surchauffe de courte duree. Les cermets au magnesium et au magnesium-beryllium, dont une des particularites caracteristiques est la resistance accrue a la chaleur, peuvent trouver une large application dans differents domaines de la technique. (author) [Spanish] Los autores exponen algunos resultados de sus estudios sobre cermets de magnesio-oxido de magnesio y sobre aleaciones superrefractarias de magnesio y berilio, preparadas mediante procedimientos pulvimetalurgicos. La incorporacion de proporciones insignificantes de oxido de magnesio finamente disperso al magnesio basta para provocar un aumento de resistencia cuya magnitud crece con la concentracion del primero, aunque las variaciones de concentracion del oxido entre el 0,3 y el 5% en peso solo influyen ligeramente en las correspondientes variaciones de la tension de rotura (ensayo rapido) en todo el intervalo de temperaturas estudiado. Para los cermets se observan los valores siguientes a 20{sup o}C: {sigma}{sub {beta}} = 28 a 31 kg/mm{sup 2} y {delta} = 3,5 a 4,5%, mientras que a 500{sup o}C resulta {sigma}{sub {beta}} = 2,6 a 3,2 kg/mm{sup 2} y {delta} = 30 a 40%. El efecto positivo de la fase oxido finamente dispersa se manifiesta sobre todo en los ensayos prolongados. Para los cermets de magnesio, {sigma}(300)/100 adopta el valor 2,2 kg/mm{sup 2}. Caracteriza particularmente a estas mezclas la constancia de las propiedades de resistencia al variar la temperatura, que se debe ante todo a la estabilidad termodinamica, dentro de la matriz metalica, de la fase oxido que acrecienta la resistencia. El empleo de los metodos pulvimetalurgicos ha permitido obtener aleaciones d e magnesio y berilio superrefractarias con elevada concentracion de berilio (aleaciones PMB). En cuanto a sus propiedades de resistencia, estas aleaciones PMB se asemejan a los cermets de Mg y MgO, aunque se distinguen por su estabilidad y prolongada resistencia a la oxidacion a altas temperaturas, que superan a las correspondientes caracteristicas de las aleaciones de magnesio actualmente conocidas. Asi, en aire a 580{sup o}C, las aleaciones PMB con 2 a 5% de berilio conservan su elevada resistencia a la oxidacion durante mas de 12 000 o incluso 14 000 h. Esta cualidad es ante todo funcion de la concentracion de berilio en la aleacion. Las aleaciones PMB se distinguen asimismo por su resistencia a los sobrecalentamientos de corta duracion. Los cermets de magnesio y las aleaciones de magnesio y berilio que se caracterizan por su acrecentada resistencia a temperaturas elevadas encontraran sin duda vastas aplicaciones en diversas ramas de la tecnica. (author) [Russian] Privodyatsya nekotorye dannye o rezul'tatakh razrabotki metallokeramicheskikh splavov magniya s okis'yu magniya i osobo zharostojkikh magnievo-berillievykh splavov, poluchaemykh s pomoshch'yu metodov poroshkovoj metallurgii. Vvedenie v magnij ute neznachitel'nogo kolichestve melkodispersnoj okisi magniya privodit k uprochneniyu, ehffektivnost' kotorogo vozrastaet s uvelicheniem kontsentratsii okisi magniya, khotya izmenenie kontsentratsii okisi v predelakh 0,3 + 5 ves.% sravnitel'no malo skazyvaetsya na otnositel'nom izmenenii predela kratkovremennoj prochnosti vo vsem intervale issledovannykh temperatur. Pri 20{sup o}C dlya metallokeramicheskikh splavov {sigma}{sub {beta}} 28 + 31 kg/mm{sup 2} i {delta} = 3,5 + 4,5%; pri 500{sup o}C {sigma}{sub {beta}} 2,6+3,2 kg/mm{sup 2} i {delta} 30 + 40%. Polozhitel'noe vliyanie melkodispersnoj okisnoj fazy osobenno skazyvaetsya pri dlitel'nykh ispytaniyakh. Dlya metallokeramicheskikh splavov magniya 3 Mg + 5 Mg {sigma} (300)/100 = 2,2 kg/mm{sup 2}. Kharakternoj osobennost'yu splavov yavlyaetsya vysokaya termicheskaya stabil'nost' prochnostnykh svojstv, chto svyazano prezhde vsego s termodinamicheskoj ustojchivost'yu uprochnyayushchej okisnoj fazy v matritse metalla. Ispol'zovanie metodov poroshkovoj metallurgii pozvolilo poluchit' osobo zharostojkie magnievo- berillievye splavy, soderzhashchie povyshennye kontsentratsii berilliya (splavy PMB). Po prochnostnym kharakteristikam splavy PMB blizki k metallokeramicheskim splavam Mg - MgO, odnako magnievo-berillievye splavy otlichayutsya ustojchivym i dlitel'nym soprotivleniem vysokotemperaturnomu okisleniyu, prevyshayushchem analogichnye svojstva izvestnykh v nastoyashchee vremya magnievykh splavov. Tak v vozdukhe pri 580{sup o}C splavy PMB s 2 + 5% berilliya sokhranyayut vysokoe soprotivlenie okisleniyu v techenie bolee 12 + 14 tysyach chasov. Resurs dlitel'noj zharostojkosti splavov opredelyaetsya, prezhde vsego, kolichestvom berilliya v splave i s uvelicheniem soderzhaniya berilliya vozrastaet. Splavy PMB otlichayutsya takzhe vysokoj ustojchivost'yu k kratkovremennym peregrevam. Metallokeramicheskie magnievye i magnievo-berillievye splavy, kharakternoj osobennost'yu kotorykh yavlyaetsya povyshennaya zharoprochnost' i zharostojkost', mogut najti shirokoe primenenie v razlichnykh oblastyakh tekhniki. (author)}
place = {IAEA}
year = {1963}
month = {Nov}
}