Publication result detail

HYPO-EUTECTOID NITI ALLOY MANUFACTURED BY CGDS POWDER MIX DEPOSITION AND HEAT TREATEMENT

JAN, V.; ČÍŽEK, J.; DYČKA, M.; ČUPERA, J.

Original Title

HYPO-EUTECTOID NITI ALLOY MANUFACTURED BY CGDS POWDER MIX DEPOSITION AND HEAT TREATEMENT

English Title

HYPO-EUTECTOID NITI ALLOY MANUFACTURED BY CGDS POWDER MIX DEPOSITION AND HEAT TREATEMENT

Type

Conference proceedings

Original Abstract

Bi-metallic Ni-Ti deposits were produced by low-pressure cold spray with air as working gas. The chemical composition of the 8 mm thick deposit was kept in hypoeutectoid concentration of 92/8 at% Ti/Ni. Samples were annealed in argon protective atmosphere at temperatures from 500°C to 1000°C for two hours. Apart from slow cooling, quenching directly from the homogenization at 1000°C was conducted on some samples and subsequent evolution of precipitated eutectoid was studied. Microstructural changes of material character during annealing were evaluated together with changes in the character of fracture behaviour and local micro hardness of the evolved phases. Microstructure and chemistry was evaluated using analytical electron microscopy. DSC study was involved in order to characterize the precipitation behaviour under eutectoid temperature. Gradual evolution of intermetallic phases by diffusion mechanism was observed. The samples general shape was preserved during the heating process although formation of Kirkendall porosity was evident. First occurrence of intermetallic phases was observed at 600°C. The evolved phases incurred by diffusion mechanism and included phases close to Ti2Ni, TiNi, and TiNi3.

English abstract

Bi-metallic Ni-Ti deposits were produced by low-pressure cold spray with air as working gas. The chemical composition of the 8 mm thick deposit was kept in hypoeutectoid concentration of 92/8 at% Ti/Ni. Samples were annealed in argon protective atmosphere at temperatures from 500°C to 1000°C for two hours. Apart from slow cooling, quenching directly from the homogenization at 1000°C was conducted on some samples and subsequent evolution of precipitated eutectoid was studied. Microstructural changes of material character during annealing were evaluated together with changes in the character of fracture behaviour and local micro hardness of the evolved phases. Microstructure and chemistry was evaluated using analytical electron microscopy. DSC study was involved in order to characterize the precipitation behaviour under eutectoid temperature. Gradual evolution of intermetallic phases by diffusion mechanism was observed. The samples general shape was preserved during the heating process although formation of Kirkendall porosity was evident. First occurrence of intermetallic phases was observed at 600°C. The evolved phases incurred by diffusion mechanism and included phases close to Ti2Ni, TiNi, and TiNi3.

Keywords

Cold Spray, reaction synthesis, intermetallics, diffusion, metallic foam

Key words in English

Cold Spray, reaction synthesis, intermetallics, diffusion, metallic foam

Authors

JAN, V.; ČÍŽEK, J.; DYČKA, M.; ČUPERA, J.

RIV year

2016

Released

09.12.2015

Publisher

University of Limoges

Location

Limoges

URL

http://www.unilim.fr/ript/

BibTex

@proceedings{BUT120151,
  editor="Vít {Jan} and Jan {Čížek} and Martin {Dyčka} and Jan {Čupera}",
  title="HYPO-EUTECTOID NITI ALLOY MANUFACTURED BY CGDS POWDER MIX DEPOSITION AND HEAT TREATEMENT",
  year="2015",
  publisher="University of Limoges",
  address="Limoges",
  url="http://www.unilim.fr/ript/"
}