Alloy design for intrinsically ductile refractory high-entropy alloys
Artikel i vetenskaplig tidskrift, 2016

Refractory high-entropy alloys (RHEAs), comprising group IV (Ti, Zr, Hf), V (V, Nb, Ta), and VI (Cr, Mo, W) refractory elements, can be potentially new generation high-temperature materials. However, most existing RHEAs lack room-temperature ductility, similar to conventional refractory metals and alloys. Here, we propose an alloy design strategy to intrinsically ductilize RHEAs based on the electron theory and more specifically to decrease the number of valence electrons through controlled alloying. A new ductile RHEA, Hf0.5 Nb 0.5 Ta 0.5Ti1.5Zr, was developed as a proof of concept, with a fracture stress of close to 1 GPa and an elongation of near 20%. The findings here will shed light on the development of ductile RHEAs for ultrahigh-temperature applications in aerospace and power-generation industries.

Intrinsic ductility

Alloy design

High-entropy alloys

Valence electron concentration

Författare

Saad Ahmed Sheikh

Chalmers, Material- och tillverkningsteknik, Yt- och mikrostrukturteknik

Samrand Shafeie

Chalmers, Material- och tillverkningsteknik, Yt- och mikrostrukturteknik

Q. Hu

Jiangxi Academy of Sciences

Johan Ahlström

Chalmers, Material- och tillverkningsteknik, Materialteknologi

Christer Persson

Chalmers, Material- och tillverkningsteknik, Materialteknologi

Veselý Jaroslav

UJP PRAHA A.s.

Zýka Jiří

UJP PRAHA A.s.

Uta Klement

Chalmers, Material- och tillverkningsteknik, Tillverkningsteknik

Sheng Guo

Chalmers, Material- och tillverkningsteknik, Yt- och mikrostrukturteknik

Journal of Applied Physics

0021-8979 (ISSN) 1089-7550 (eISSN)

Vol. 120 Art no 164902- 164902

Drivkrafter

Hållbar utveckling

Ämneskategorier

Materialteknik

Metallurgi och metalliska material

Styrkeområden

Energi

Materialvetenskap

DOI

10.1063/1.4966659