Powder sintering and dilatometric studies of Fe-Ni invar alloys

J. Chen, E. V. Abdulmenova, S. N. Kulkov

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The paper addresses the study of thermal expansion of alloys fabricated by sintering of Fe and Ni powders. The phase composition and structure of the sintered alloys are found to correspond to invar alloys. The Fe-Ni alloys sintered using Ni and Fe powders exhibit the FCC structure with parameters similar to those of invar alloys. In case of low Ni concentration of 30-32 wt %, a BCC phase can be observed. The thermal expansion coefficient of the microstructure depends on Ni concentration: at 30-35 wt % Ni it decreases from 18 u 10-6 up to 1.5 u 10-6, and at higher Ni concentration it increases insignificantly. Measurement of the thermal expansion coefficient of the sintered Fe-35 wt % Ni alloys reveals two sections in the dependence of the change in the sample elongation against temperature. These sections are characterized by different CTE, and the inflection point of about 233°C corresponds to Curie temperature.

Original languageEnglish
Title of host publicationProceedings of the International Conference on Physical Mesomechanics. Materials with Multilevel Hierarchical Structure and Intelligent Manufacturing Technology
EditorsVictor E. Panin, Vasily M. Fomin
PublisherAmerican Institute of Physics Inc.
ISBN (Electronic)9780735440463
DOIs
Publication statusPublished - 14 Dec 2020
EventInternational Conference on Physical Mesomechanics. Materials with Multilevel Hierarchical Structure and Intelligent Manufacturing Technology 2020 - Tomsk, Russian Federation
Duration: 5 Oct 20209 Oct 2020

Publication series

NameAIP Conference Proceedings
Volume2310
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

ConferenceInternational Conference on Physical Mesomechanics. Materials with Multilevel Hierarchical Structure and Intelligent Manufacturing Technology 2020
CountryRussian Federation
CityTomsk
Period5.10.209.10.20

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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