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2018 | OriginalPaper | Buchkapitel

13. Refractory Metals and Refractory Metal Alloys

verfasst von : Wolfram Knabl, Gerhard Leichtfried, Roland Stickler

Erschienen in: Springer Handbook of Materials Data

Verlag: Springer International Publishing

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Abstract

Refractory metals belong to the 5th and 6th group of the periodic system of elements and have a melting point above 2000^∘C. Examples are Nb, Ta, Mo and W.

This chapter provides an overview of this class of materials. After a review of different production routes, the typical compositions of commercial refractory metal alloys and their applications are described. Physical and chemical properties are listed and the recrystallization behavior, as well as the mechanical properties including low- and high-cycle fatigue, are depicted. The mechanisms leading to an increased recrystallization temperature by either doping Mo and W with rare earth oxides or by K-doping of W are explained. Furthermore, fracture mechanics and creep properties are described and an extensive compilation of materials data is included.

In addition to a high melting point, the metals Nb, Ta, Mo, and W have a low coefficient of thermal expansion, a low vapor pressure, and an excellent corrosion resistance against acids, liquid metals and ceramic melts. Mo and W have a high thermal and electrical conductivity, a high Young's modulus and mechanical properties, which strongly depend on the content of interstitial impurities such as oxygen, sulfur, phosphorous, nitrogen, carbon and boron. The interrelationships are summarized in this chapter.

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Vorheriges Kapitel Copper and Copper Alloys

Nächstes Kapitel Noble Metals and Noble Metal Alloys

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Titel: Refractory Metals and Refractory Metal Alloys
verfasst von: Wolfram Knabl
Gerhard Leichtfried
Roland Stickler
Verlag: Springer International Publishing
Buch: Springer Handbook of Materials Data
Print ISBN: 978-3-319-69741-3

Electronic ISBN: 978-3-319-69743-7

Copyright-Jahr: 2018
DOI: https://doi.org/10.1007/978-3-319-69743-7_13

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Die im Laufe eines Jahres in der „adhäsion“ veröffentlichten Marktübersichten helfen Anwendern verschiedenster Branchen, sich einen gezielten Überblick über Lieferantenangebote zu verschaffen.

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