NbMoTaW refractory high entropy alloy composites strengthened by in-situ metal-non-metal compounds

Title
NbMoTaW refractory high entropy alloy composites strengthened by in-situ metal-non-metal compounds
Authors
김동익김한열Aeran RohDaeyoung KimSeungjin NamKee-Ahn LeeHyunjoo ChoiJae-Hun Kim
Keywords
Refractory high-entropy alloy; Powder metallurgy; Composite; Mechanical alloying; Spark plasma sintering; Mechanical property
Issue Date
2020-05
Publisher
Journal of alloys and compounds
Citation
VOL 822, 153423
Abstract
In this study, a new class of NbMoTaW refractory high-entropy alloys (RHEAs), containing metal-non-metal compounds, was produced by a power metallurgical route. A non-equilibrium beta Ta phase was generated, while Nb, Mo, Ta, and W formed HEAs during mechanical milling. Additionally, the beta Ta phase attracted oxygen and carbon to form face-centered cubic (FCC) structured metal?non-metal compounds during sintering. The compounds acted as an effective reinforcement to strengthen the RHEAs at both room and high temperatures. Thus, the alloys exhibited superior hardness at room temperature, ranging from 689.46 to 892.38 HV, and excellent compression strength of 1,630 MPa at 800 °C. Hence, the alloys are suitable candidates for high-temperature structural materials used in turbine blades and thermal protection sheets.
URI
http://pubs.kist.re.kr/handle/201004/72293
ISSN
0925-8388
Appears in Collections:
KIST Publication > Article
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