Microstructure and mechanical properties of bulk annealed AlCoCrFeNi2.1 eutectic high-entropy alloy Online publication date: Wed, 27-Oct-2021
by Wenna Jiao; Junyang He; Tianxin Li; Yiping Lu; Tingju Li
International Journal of Computational Materials Science and Surface Engineering (IJCMSSE), Vol. 10, No. 2, 2021
Abstract: Eutectic high-entropy alloys (EHEAs) with excellent casting and mechanical properties are promising candidates for the industrial application. In this paper, the phase and microstructure stability of bulk AlCoCrFeNi2.1 EHEA at 2.5 kg level in as-cast and 900°C, 1000°C and 1100°C annealed states were investigated. Uniform lamellar structure composed of face centred cubic (FCC) and B2 phase prevails in the as-cast alloy, and maintains stable up to 1100°C. Rod-like precipitates appear in FCC phase after the heat treatment of 900 °C, and the irregular lamellar structure seems coarser. Moreover, the hardness of the EHEA falls into a narrow range of 245 HV to 278 HV regardless of the change of the annealing temperature. The tensile test results further confirm that the AlCoCrFeNi2.1 EHEA maintains good mechanical properties.
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