Structure and properties of invar alloys for MIM technologies

S. N. Kulkov, E. V. Abdulmenova, V. S. Shadrin, A. A. Leonov, R. V. Levkov

Research output: Contribution to journalConference article

Abstract

The paper studied Fe-Ni alloys obtained by sintering from mixtures of powders. Powders with 30-40 wt. Ni were mixed with paraffin and wax binder and then pressed and sintered at 1300 °C during 1 hour. It has been shown that the face centered cubic lattice (γ-phase) and body centered cubic lattice (α-phase) are formed after sintering of powders mixture. The content of the α-phase decreases from 37 % to 2 % with increase of Ni concentration from 30 to 35 wt. % Ni in powders mixture. The average grain size of the γ-phase decreases from 26.5±12.3 μm to 18.3±9.1 μm, and porosity of samples increases from 13±1.4 % to 18.4±1.1 %.The lattice parameter of the γ-phase increases from 3.5849•10-10 m to 3.597•10-10 m and it corresponds to well-known invar alloys. The maximum value of the microhardness of sintered samples is 1.04±0.07 GPa. Thus, alloys obtained by sintering of Fe and Ni powder mixtures has an invar properties typical of cast alloys.

Original languageEnglish
Article number012005
JournalIOP Conference Series: Materials Science and Engineering
Volume696
Issue number1
DOIs
Publication statusPublished - 27 Nov 2019
Event3rd International Scientific and Technical Conference on Materials, Technology and Equipment for the Development of the Arctic and Siberia, ARCTIC 2019 - Tomsk, Russian Federation
Duration: 25 Sep 201928 Sep 2019

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)

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