INFLUENCE OF DIRECTIONAL SOLIDIFICATION ON THE MICROSTRUCTURE OF IN-SITU FESI–NIAL COMPOSITES

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27360%2F25%3A10260649" target="_blank" >RIV/61989100:27360/25:10260649 - isvavai.cz</a>

Result on the web

<a href="https://www.confer.cz/metal/2025/read/5151-influence-of-directional-solidification-on-the-microstructure-of-in-situ-fesi-nial-composites.pdf" target="_blank" >https://www.confer.cz/metal/2025/read/5151-influence-of-directional-solidification-on-the-microstructure-of-in-situ-fesi-nial-composites.pdf</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.37904/metal.2025.5151" target="_blank" >10.37904/metal.2025.5151</a>

Result language

angličtina

Original language name

INFLUENCE OF DIRECTIONAL SOLIDIFICATION ON THE MICROSTRUCTURE OF IN-SITU FESI–NIAL COMPOSITES

Original language description

This study investigates advanced composite materials consisting of a NiAl matrix reinforced with an FeSi phase, which are considered promising candidates for next-generation tool applications, with the potential to replace conventional high-speed steels alloyed with tungsten and cobalt. The alloys were synthesized via vacuum induction melting followed by centrifugal casting. To further tailor their microstructure, an experimental alloy with a 1:1 mass ratio of matrix to reinforcing phase was subjected to directional solidification using the Bridgman method. The process was carried out at a temperature of 1450 °C with a holding time of 30 minutes, followed by controlled crystallization at a rate of 100 mm/h. Microstructural characterization was performed using the light optical microscopy (LOM) and scanning electron microscopy (SEM). The chemical composition was determined by energy-dispersive X-ray spectroscopy (EDX), and the microhardness was measured using the Vickers indentation method. In the as-cast state, the alloy exhibited a typical in-situ composite microstructure consisting of primary NiAl-based dendrites and interdendritic regions containing lamellar eutectic structures and discrete reinforcing phases. The eutectic structures were composed of alternating FeSi- and NiAl-based phases, while certain interdendritic areas were occupied by an FeSi-based phase with only minor Ni and Al content. Directional solidification via the Bridgman method, which enables controlled solidification through precise regulation of the temperature gradient and solidification front velocity, significantly influenced the morphology and distribution of these phases. As a result, the alloy featured a more refined, oriented, and homogeneous microstructure, which is beneficial for improving mechanical performance and structural integrity in advanced composite applications. © METAL 2025.All rights reserved.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

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OECD FORD branch

20500 - Materials engineering

Project

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Continuities

N - Vyzkumna aktivita podporovana z neverejnych zdroju

Publication year

2025

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

METAL 2025 : 34th International Conference on Metallurgy and Materials : abstracts : May 21 - 23, 2025, OREA Congress Hotel Brno, Czech Republic, EU

ISBN

978-80-88365-26-6

ISSN

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e-ISSN

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Number of pages

6

Pages from-to

458-463

Publisher name

Tanger

Place of publication

Ostrava

Event location

Brno

Event date

May 21, 2025

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

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