A new method of preparing high-performance high-entropy alloys through high-gravity combustion synthesis

A new method of high-gravity combustion synthesis (HGCS) followed by post-treatment (PT) is reported for preparing high-performance high-entropy alloys (HEAs), Cr 0.9 FeNi 2.5 V 0.2 Al 0.5 alloy, whereby cheap thermite powder is used as the raw material. In this process, the HEA melt and the ceramic...

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Bibliographic Details
Published in:International journal of minerals, metallurgy and materials metallurgy and materials, 2020-10, Vol.27 (10), p.1347-1352
Main Authors: Zheng, Fu-kai, Zhang, Guan-nan, Chen, Xiu-juan, Yang, Xiao, Yang, Zeng-chao, Li, Yong, Li, Jiang-tao
Format: Article
Language:English
Subjects:
Alloys
Ceramics
Characterization and Evaluation of Materials
Chemistry and Materials Science
Cold rolling
Cold treatment
Combustion
Combustion synthesis
Composites
Corrosion and Coatings
Electric arc melting
Elongation
Exothermic reactions
Glass
Gravitational fields
High entropy alloys
High temperature
Master alloys
Materials Science
Metallic Materials
Natural Materials
Phase separation
Raw materials
Surfaces and Interfaces
Tensile strength
Thin Films
Tribology
Vacuum arc melting
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Summary:A new method of high-gravity combustion synthesis (HGCS) followed by post-treatment (PT) is reported for preparing high-performance high-entropy alloys (HEAs), Cr 0.9 FeNi 2.5 V 0.2 Al 0.5 alloy, whereby cheap thermite powder is used as the raw material. In this process, the HEA melt and the ceramic melt are rapidly formed by a strong exothermic combustion synthesis reaction and completely separated under a high-gravity field. Then, the master alloy is obtained after cooling. Subsequently, the master alloy is sequentially subjected to conventional vacuum arc melting (VAM), homogenization treatment, cold rolling, and annealing treatment to realize a tensile strength, yield strength, and elongation of 1250 MPa, 1075 MPa, and 2.9%, respectively. The present method is increasingly attractive due to its low cost of raw materials and the intermediate product obtained without high-temperature heating. Based on the calculation of phase separation kinetics in the high-temperature melt, it is expected that the final alloys with high performance can be prepared directly across master alloys with higher high-gravity coefficients.
ISSN:1674-4799
1869-103X
DOI:10.1007/s12613-020-2028-x