Mihael Brunčko (Author), Ivan Anžel (Author), Albert C. Kneissl (Author)

Abstract

This paper presents a non-destructive measurement method that enables identification and characterization of phenomena during internal oxidation of metallic materials as well as monitoring the kinetics of internal oxidation using "in-situ" electrical resistance measurements. A special laboratory device, based on the unique measurement cell, for the electrical resistance measurements at high temperatures and the model for electrical resistance transformation into an instantaneous microstructure were developed. To accomplish this, the process of internal oxidation was divided into the sequence of the key partial reactions that were presented in the model as the parallel andžor serial connected time variable resistors in the electrical circuit. The validity of the transformation model was experimentally confirmedby internal oxidation of Ag-Sn (2 at.% Sn) alloy at different oxidation temperatures in air atmosphere. The comparison of the results obtained by "in-situ" electrical resistance measurements with those obtained by metallographic analysis and Wagnerćs theory shows that the novel method presents a more effective tool for monitoring of internal oxidation kinetics. The method identifies also the microstructural defects and their influences onthe kinetics of internal oxidation.

Keywords

metalurgija;zlitina Ag-Sn;notranja oksidacija;električna upornost;metallurgy;Ag-Sn alloy;internal oxidation;electrical resistance;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UM FS - Faculty of Mechanical Engineering
UDC: 669
COBISS: 10702870 Link will open in a new window
ISSN: 0010-938X
Views: 1242
Downloads: 32
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Other data

Secondary language: English
Secondary keywords: metalurgija;zlitina Ag-Sn;notranja oksidacija;električna upornost;
URN: URN:SI:UM:
Pages: str.1228-1244
Volume: ǂVol. ǂ49
Issue: ǂiss. ǂ3
Chronology: Mar. 2007
ID: 8718624