A novel High-Entropy Alloy-based composite material

DOI: 10.1016/j.jallcom.2017.09.274

Authors: Sephira Riva (Swansea University) , Adam Tudball (Kennametal Manufacturing (UK) Ltd) , Shahin Mehraban (Swansea University) , Nicholas P. Lavery (Swansea University) , Stephen G. R. Brown (Swansea University) , Kirill V. Yusenko (Swansea University; Institute of Solid State Chemistry)
Co-authored by industrial partner: Yes

Type: Journal Paper
Journal: Journal Of Alloys And Compounds , VOL 730 , PAGES 544 - 551

State: Published (Approved)
Published: September 2017
Diamond Proposal Number(s): 13987

Abstract: This study reports the results of the addition of different reinforcing agents (i.e. nano-diamonds, SiC, Sc2O3, h-BN, c-BN and CN) on the sintering process of the B2-structured Al2CoCrFeNi High-Entropy Alloy. The best candidate for further thermal, electrical and mechanical characterization was chosen to be the alloy containing 2 wt% nano-diamonds. The composite was prepared using spark-plasma sintering of pre-alloyed powders and characterized with SEM-EDX, DSC, Laser Flash Analysis (LFA), electrical conductivity and Seebeck coefficient, dilatometry, Young's modulus, Vicker's hardness, 3-points flexural test. It shows unexpectedly low thermal expansion coefficient (from 3 × 10−6 to 17 × 10−6 K−1 between RT and 500 °C), high electrical resistivity and Seebeck coefficient and hardness comparable to the sintered blank Al2CoCrFeNi.

Journal Keywords: High-entropy alloys; Metal matrix composites; Spark plasma sintering; Nano-diamonds composite; Thermo-electric properties

Diamond Keywords: Alloys

Subject Areas: Materials


Instruments: I11-High Resolution Powder Diffraction

Other Facilities: ESRF

Added On: 23/11/2017 09:54

Discipline Tags:

Quantum Materials Materials Science Thermoelectrics Composite Materials Metallurgy

Technical Tags:

Diffraction X-ray Powder Diffraction