1. A new design strategy for purifying and strengthening W alloy by self-decomposing in-situ nanoparticles.
- Author
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Hu, Weiqiang, Wei, Lianfeng, He, Jun, Chen, Songhua, Liu, Shaocun, Ma, Zongqing, and Liu, Yongchang
- Subjects
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TUNGSTEN alloys , *HEAT resistant alloys , *ALUMINUM oxide , *ALLOYS , *NANOPARTICLES - Abstract
In this work, we creatively introduced MAX additives (Ti 2 AlC) into W alloy system to break the development bottleneck of ball milling technology: a large amount of oxygen impurities and large-sized second phase particles at grain boundaries (GBs). Unlike traditional oxides/carbides, Ti 2 AlC can undergo self-decomposition during high-temperature sintering stage (>1400 °C) on the basis of hydrogen sintering, and continue to adsorb a number of stubborn oxygen impurities to form various smaller, more dispersed, and stronger in-situ Ti x C y , TiO x , Al 2 O 3 , and Al x Ti y O z nanoparticles. Furthermore, these in-situ nanoparticles could maintain stable coherent interfaces with W, thereby more effectively refining, purifying, and strengthening matrix. Compared to traditional W-carbide/oxide alloys, MAX additives render our alloy with high hardness (521 ± 24 HV 0.2), a remarkable combination of high compressive strength (1262.9 ± 35.1 MPa) and large ductility (9.88%). This work provides a new perspective for the preparation of high-performance refractory metals and relevant engineering application. • The MAX phase (Ti 2 AlC) is innovatively added into W alloys. • The Ti 2 AlC phase decomposes at above >1400 °C and forms in-situ nanoparticles. • The Ti 2 AlC phase continues to adsorb stubborn oxygen impurities at sintering stage. • In-situ nanoparticles could maintain stable coherent interfaces with W. • The W-Ti 2 AlC alloy possess excellent mechanical properties. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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