Microstructural stability and high-temperature mechanical behavior of Al–Ni–Zr alloy strengthened by L1▫$_2$▫-Al▫$_3$▫Zr precipitates

Šmalc, Jan (avtor), Zaky, Adam (avtor), Markoli, Boštjan (avtor), Šturm, Roman (avtor)

Aluminum alloys based on the eutectic Al–Ni system are a promising class of lightweight materials for applications at elevated temperatures owing to the thermal stability of the eutectic Al▫$_3$▫Ni phase. In this study, the eutectic Al–Ni alloy was modified by the addition of 0.6 wt.% Zr to enhance the αAl matrix by precipitation strengthening. The alloys were cast and subjected to T5 heat treatment followed by long-term isothermal aging at 350 ◦C. A comprehensive study was carried out to evaluate the evolution of microstructure, micro-hardness and mechanical performance over time. The formation of fine, coherent L1▫$_2$▫-Al▫$_3$▫Zr precipitates contributed to significant strengthening, as reflected by a ~60% increase in microhardness and an approximately twofold improvement in room temperature (RT) yield strength. A TEM analysis of the L1▫$_2$▫-Al▫$_3$▫Zr precipitates showed relatively good thermal stability after 30 days. Despite the improved mechanical properties at room temperature, the alloy did not retain this improvement when tested at 300 ◦C. Nevertheless, these results provide a comprehensive insight into the aging and thermal stability of Al–Ni–Zr alloys.

• Jezik: Angleški jezik
• Ključne besede: aluminum–nickel eutectic, precipitation strengthening, microhardness, accelerated creep test
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FS - Fakulteta za strojništvo ; NTF - Naravoslovnotehniška fakulteta
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Leto izida: 2025
• Št. strani: 13 str.
• Številčenje: Vol. 18, issue 13, art. 3068
• PID: 20.500.12556/RUL-170422
• UDK: 669
• ISSN pri članku: 1996-1944
• DOI: 10.3390/ma18133068
• COBISS.SI-ID: 241210371
• Datum objave v RUL: 04.07.2025

Gradivo je del revije

• Naslov: Materials
• Skrajšan naslov: Materials
• Založnik: MDPI
• ISSN: 1996-1944
• COBISS.SI-ID: 33588485

Licence

• Licenca: CC BY 4.0, Creative Commons Priznanje avtorstva 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by/4.0/deed.sl
• Opis: To je standardna licenca Creative Commons, ki daje uporabnikom največ možnosti za nadaljnjo uporabo dela, pri čemer morajo navesti avtorja.

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: eutektik aluminij-nikelj, izločevalno utrjevanje, mikrotrdota, pospešeni testi lezenja

Projekti

• Financer: ARIS - Javna agencija za znanstvenoraziskovalno in inovacijsko dejavnost Republike Slovenije
• Številka projekta: P2-0270
• Naslov: Proizvodni sistemi, laserske tehnologije in spajanje materialov