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Microstructures and Mechanical Properties of AlCrFeNiMo0.5Tix High Entropy Alloys

Funds: Supported by the National Natural Science Foundation of China under Grant No 51571127.
  • Received Date: October 23, 2017
  • Published Date: February 28, 2018
  • Effects of Ti addition on the microstructures and mechanical properties of AlCrFeNiMo0.5Tix (x=0, 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 x 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 x above 0.5. Meanwhile, the compressive ductility of the alloy system decreases with Ti addition. The AlCrFeNiMo0.5Ti0.6 and AlCrFeNiMo0.5Ti0.75 HEAs become brittle and fracture with very limited plasticity. In the AlCrFeNiMo0.5Tix HEAs, the AlCrFeNiMo0.5 HEA possesses the highest compressive fracture strength of 4027 MPa and the largest compressive plastic strain of 27.9%, while the AlCrFeNiMo0.5Ti0.5 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 AlCrFeNiMo0.5Tix (x=0, 0.25, 0.4, 0.5) HEAs demonstrates that this alloy system is very promising for engineering applications.
  • Article Text

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