Microstructure and properties of AlCr_xFeNi_1.2Cu_0.8 high-entropy alloys at high temperature

Abstract

With the development of space technology, high-temperature resistant materials have become one of the hot spots in space research. The research of new high-temperature materials has become the key to breakthrough in aviation field. Research on microstructure and properties of AlCr_xFeNi_1.2Cu_0.8 high-entropy alloys at high temperature (900, 1000 and 1100°C) were studied in this paper. After high-temperature annealing, the structural stability of alloys is maintained and the microstructure of alloys is dendrite. The grains are refined with the increase of Cr content. The alloy exhibits excellent comprehensive mechanical properties after heat treatment. The compressive strength of the alloy is above 1000 MPa and the plasticity of the alloy is above 10%. The alloy changes from brittle to tough with the increase in temperature. The hardness of Cr1.25 specimen is doubled after annealing, and the corrosion resistance of Cr 0.5 specimen is the best.

KEYWORDS:

• High-entropy alloys
• High temperature
• Microstructure
• Mechanical properties
• Corrosion resistance

Disclosure statement

No potential conflict of interest was reported by the author(s).

Data availability statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

Additional information

Funding

This work was supported by the National Natural Science Foundation of China (grant number 51861021, No.51661016, No.51971103), Science and Technology Plan of Gansu Province (grant number 21YF5GA074), Public Welfare Project of Zhejiang Natural Science Foundation (grant number LGG22E010008), and Key Research Program of Education Department of Gansu Province (grant number GSSYLXM-03).