Details
| Originalsprache | Englisch |
|---|---|
| Aufsatznummer | 107170 |
| Fachzeitschrift | International Journal of Refractory Metals and Hard Materials |
| Jahrgang | 130 |
| Frühes Online-Datum | 29 März 2025 |
| Publikationsstatus | Veröffentlicht - Aug. 2025 |
Abstract
Eutectic Nb-18.7Si alloys with different ceramic nanoparticle addition (Al2O3, TiC, SiC, 5 mol.-%), prepared by arc-melting, were heat-treated for 24 h at 1500 °C. Phase composition, microstructure transition and mechanical properties were investigated. The results show that the γ-Nb5Si3 and small Nb3Si phases from the as-cast alloy decomposed into α-Nb5Si3 and Nbss/α-Nb5Si3-eutectoids. Larger Nb3Si phases still existed after heat treatment. Additionally, after heat treatment the Nbss phases were interconnected to a continuous matrix, while silicides appeared coarsened and spherical while being uniformly distributed in the Nbss phase. This effect was most pronounced in the alloy with addition of Al2O3 nanoparticles, due to the ultrafine nano-scale lamellar structures of Nbss + α-Nb5Si3 in its as-cast condition. While the added nanoparticles had a strong effect on the initial microstructure of the as-cast state, they showed no noticeable effects like pinning of grain boundaries during heat treatment. A decrease in hardness was observed due to the coarsening of the microstructure and the reduced area fraction of silicide phases. However, the transformation to the coarser microstructure with a continuous Nbss matrix and spherical silicide phases seems to be effective in inhibiting crack propagation by promoting crack deflection and bridging over the Nbss phase.
ASJC Scopus Sachgebiete
- Werkstoffwissenschaften (insg.)
- Keramische und Verbundwerkstoffe
- Ingenieurwesen (insg.)
- Werkstoffmechanik
- Ingenieurwesen (insg.)
- Maschinenbau
- Werkstoffwissenschaften (insg.)
- Metalle und Legierungen
- Werkstoffwissenschaften (insg.)
- Werkstoffchemie
Zitieren
- Standard
- Harvard
- Apa
- Vancouver
- BibTex
- RIS
in: International Journal of Refractory Metals and Hard Materials, Jahrgang 130, 107170, 08.2025.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - Effect of heat treatment on nanoparticle reinforced Nb-18.7Si alloy
AU - Holzmann, Elisa
AU - Barienti, Khemais
AU - Guglielmi, Mattia
AU - Baake, Egbert
AU - Herbst, Sebastian
AU - Maier, Hans Jürgen
N1 - Publisher Copyright: © 2025
PY - 2025/8
Y1 - 2025/8
N2 - Eutectic Nb-18.7Si alloys with different ceramic nanoparticle addition (Al2O3, TiC, SiC, 5 mol.-%), prepared by arc-melting, were heat-treated for 24 h at 1500 °C. Phase composition, microstructure transition and mechanical properties were investigated. The results show that the γ-Nb5Si3 and small Nb3Si phases from the as-cast alloy decomposed into α-Nb5Si3 and Nbss/α-Nb5Si3-eutectoids. Larger Nb3Si phases still existed after heat treatment. Additionally, after heat treatment the Nbss phases were interconnected to a continuous matrix, while silicides appeared coarsened and spherical while being uniformly distributed in the Nbss phase. This effect was most pronounced in the alloy with addition of Al2O3 nanoparticles, due to the ultrafine nano-scale lamellar structures of Nbss + α-Nb5Si3 in its as-cast condition. While the added nanoparticles had a strong effect on the initial microstructure of the as-cast state, they showed no noticeable effects like pinning of grain boundaries during heat treatment. A decrease in hardness was observed due to the coarsening of the microstructure and the reduced area fraction of silicide phases. However, the transformation to the coarser microstructure with a continuous Nbss matrix and spherical silicide phases seems to be effective in inhibiting crack propagation by promoting crack deflection and bridging over the Nbss phase.
AB - Eutectic Nb-18.7Si alloys with different ceramic nanoparticle addition (Al2O3, TiC, SiC, 5 mol.-%), prepared by arc-melting, were heat-treated for 24 h at 1500 °C. Phase composition, microstructure transition and mechanical properties were investigated. The results show that the γ-Nb5Si3 and small Nb3Si phases from the as-cast alloy decomposed into α-Nb5Si3 and Nbss/α-Nb5Si3-eutectoids. Larger Nb3Si phases still existed after heat treatment. Additionally, after heat treatment the Nbss phases were interconnected to a continuous matrix, while silicides appeared coarsened and spherical while being uniformly distributed in the Nbss phase. This effect was most pronounced in the alloy with addition of Al2O3 nanoparticles, due to the ultrafine nano-scale lamellar structures of Nbss + α-Nb5Si3 in its as-cast condition. While the added nanoparticles had a strong effect on the initial microstructure of the as-cast state, they showed no noticeable effects like pinning of grain boundaries during heat treatment. A decrease in hardness was observed due to the coarsening of the microstructure and the reduced area fraction of silicide phases. However, the transformation to the coarser microstructure with a continuous Nbss matrix and spherical silicide phases seems to be effective in inhibiting crack propagation by promoting crack deflection and bridging over the Nbss phase.
KW - AlO
KW - Heat treatment
KW - Microstructure
KW - Nanoparticle
KW - Nb-Si based alloy
KW - SiC
KW - TiC
UR - http://www.scopus.com/inward/record.url?scp=105001541382&partnerID=8YFLogxK
U2 - 10.1016/j.ijrmhm.2025.107170
DO - 10.1016/j.ijrmhm.2025.107170
M3 - Article
AN - SCOPUS:105001541382
VL - 130
JO - International Journal of Refractory Metals and Hard Materials
JF - International Journal of Refractory Metals and Hard Materials
SN - 0263-4368
M1 - 107170
ER -