Bibliothek

feed icon rss

Ihre E-Mail wurde erfolgreich gesendet. Bitte prüfen Sie Ihren Maileingang.

Leider ist ein Fehler beim E-Mail-Versand aufgetreten. Bitte versuchen Sie es erneut.

Vorgang fortführen?

Exportieren
  • 1
    ISSN: 1436-5073
    Schlagwort(e): Key words: Auger electron spectroscopy; depth profiling; iron nitride; implantation; plasma.
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract.  The depth distribution and the lateral distribution of nitrogen after implantation by means of plasma immersion ion implantation (PIII) in ferritic alloys with 0.3 wt.-% Al and 3.6 wt.-% Cr has been studied by scanning Auger electron spectrometry (AES). To get information about the chemical state of nitrogen and to improve the detection limit methods of data analysis (factor analysis, LLS) have been applied to depth and line profiles, respectively. Thereby the detection limit for nitrogen was reduced from 6% to 1%. The nitrogen distribution is laterally homogeneous in the near surface region only. Depth profiles obtained at several points within the sputter crater showed that the in-depth distribution of nitrogen varies markedly between different points on the sample and from sample to sample. The nitrogen concentration in the implantation maximum corresponds to Fe2N1−x (x ≈ 0.04 ⃛ 0.18). A remarkable feature are grains having a 10 μm wide seam rich in N and a nearly nitrogen-free grain’s interior. The N/Fe ratio determined from line profiles show that the outer layer of the grains has almost the exact composition Fe4N and the transition to the nearly nitrogen-free grain's interior (cN ≤ 1%) occurs within 1 ⃛ 4 μm. The same shape of the N(KLL) peak was found in depth profiles and line scans, respectively, and it corresponds to gasnitrided samples γ ′–Fe4N and ɛ–Fe2N1−x.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 2
    Digitale Medien
    Digitale Medien
    Springer
    Czechoslovak journal of physics 49 (1999), S. 349-358 
    ISSN: 1572-9486
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract This paper describes the influence of thermal cycling on the damping behaviour of composites with Mg matrix and two contents (26.0 and 34.1 vol.%) of Saffil short fibres. The composites were prepared by squeeze casting. The logarithmic decrement, as a characteristic of the process responsible for the damping behaviour, was measured after ten thermal cycles between room temperature and an upper temperature. The upper temperature was varied within the range from 100 to 450°C. The strain dependence of the logarithmic decrement can be divided into two regions. A region of strain amplitude independent damping at low strains is followed by a region with amplitude dependent damping at higher strains. The damping level in the strain amplitude independent region depends weakly on the upper temperature of the cycle whereas the values of the logarithmic decrement in the strain amplitude dependent region depend very sensitively on the upper temperature of cycles. The observed experimental data can be explained considering creation of new dislocations during thermal cycling following recovery processes at higher upper temperatures of the cycle.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 3
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 12 (1981), S. 142-150 
    ISSN: 0933-5137
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Maschinenbau
    Beschreibung / Inhaltsverzeichnis: Surface Alloying of Tool Steels with Carbides by Laser or Electron Beam Melting.It is shown how the properties of tool steels can be improved by laser or electron beam melting and alloying of the surface. Various techniques can be employed depending on the base material and intended application. Crack free surface treated layers 1-1.5 mm thick can be produced. The hardness profiles, structures and oxidation resistance of these layers are compared for the different techniques and materials.
    Notizen: Die vorliegende Arbeit zeigt, wie sich die Oberflächen von Werkzeugstählen durch Umschmelzen und Oberflächenlegieren mittels eines Laser/Elektronenstrahls veredeln lassen.Je nach Grundmaterial und beabsichtigtem Einsatz lassen sich durch verschiedene Techniken und geeignete Prozeßführung rißfreie Oberflächenschichten mit einer maximalen Schichtdicke von 1-1,5 mm herstellen.Härteprofile, Gefügeausbildung und Zunderbeständigkeit, die sich bei den verschiedenen Techniken erzielen lassen, werden gegenüber gestellt.
    Zusätzliches Material: 11 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
Schließen ⊗
Diese Webseite nutzt Cookies und das Analyse-Tool Matomo. Weitere Informationen finden Sie hier...