Microstructures and Mechanical Properties of AlCrFeNiMoTi High Entropy Alloys
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Abstract
Effects of Ti addition on the microstructures and mechanical properties of AlCrFeNiMoTi (, 0.25, 0.4, 0.5, 0.6, 0.75) high entropy alloys (HEAs) are investigated. All these HEAs of various Ti contents possess dual BCC structures, indicating that Ti addition does not induce the formation of any new phase in these alloys. As Ti addition varies from 0 to 0.75, the Vickers hardness (HV) of the alloy system increases from 623.7 HV to 766.2 HV, whereas the compressive yield stress firstly increases and then decreases with increasing above 0.5. Meanwhile, the compressive ductility of the alloy system decreases with Ti addition. The AlCrFeNiMoTi and AlCrFeNiMoTi HEAs become brittle and fracture with very limited plasticity. In the AlCrFeNiMoTi HEAs, the AlCrFeNiMo HEA possesses the highest compressive fracture strength of 4027 MPa and the largest compressive plastic strain of 27.9%, while the AlCrFeNiMoTi HEA has the highest compressive yield strength of 2229 MPa and a compressive plastic strain of 10.1%. The combination of high strength and large plasticity of the AlCrFeNiMoTi (, 0.25, 0.4, 0.5) HEAs demonstrates that this alloy system is very promising for engineering applications. -
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References
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