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Citation: CHEN Jialin, LI Shutao, CHEN Yeqing. A study on dynamic mechanical properties of Al0.3CoCrFeNi high-entropy alloy considering crystal orientation[J]. Explosion And Shock Waves, 2024, 44(3): 031401. doi: 10.11883/bzycj-2023-0324

A study on dynamic mechanical properties of Al0.3CoCrFeNi high-entropy alloy considering crystal orientation

doi: 10.11883/bzycj-2023-0324
  • Received Date: 2023-09-07
  • Rev Recd Date: 2023-11-23
  • Available Online: 2023-11-24
  • Publish Date: 2024-03-14
  • High-entropy alloy (HEA) materials exhibit different failure modes and mechanical properties under high strain rate dynamic response. Because its potential mechanism cannot be fully explained from a macro perspective, it is necessary to study the atomic structure change, dislocation distribution change, evolution mechanism and deformation mechanism in the dynamic response process from a microscopic perspective. This study provides a reference for optimizing the processing technology and preparation method of HEA protective materials. The molecular dynamics simulation is adopted to design the compression, tensile at different strain rates and impact tests of [110], [111] and [100] three oriented Al0.3CoCrFeNi HEA. The atomic structure changes, dislocation distribution change, evolution mechanism and deformation mechanism in the dynamic response process are then analyzed. In the compression test: the yield strength of Al0.3CoCrFeNi high-entropy alloy with [110] orientation structure is the highest, followed by [111] and [100]. The main deformation mechanism of the [100] orientation structure is twin deformation, [110] orientation structure is slip deformation, and [111] orientation structure is dislocation deformation. In the tensile test: the yield strength of Al0.3CoCrFeNi high-entropy alloy with [111] orientation structure is the highest, followed by [100] and [110]. [100] orientation structure presents more twin structure during the tensile process; [110] exhibits more regular hexagonal close-packed structure slip surface; while [111] does not produce any slip surface. With the increase of strain rate, the compressive and tensile yield strength increased greatly, and the corresponding elongation increased, too. The plastic deformation mechanism at low strain rate (1×109 s−1) is mainly slip deformation, but the number of slip systems is small. The plastic deformation mechanism at medium strain rate (1×1010 s−1) is mainly slip deformation mechanism, but many slip systems appear. The plastic deformation mechanism at high strain rate (1×1011 s−1) is induced by amorphous atoms with disordered atomic arrangement. The Al0.3CoCrFeNi high-entropy alloy with [110] orientation structure has the best impact resistance, which is attributed to its highest yield strength and the highest stress at the end of the yield stage.
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