Journal
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
Volume 25, Issue 9, Pages 2958-2964Publisher
ELSEVIER
DOI: 10.1016/S1003-6326(15)63922-X
Keywords
high entropy alloy; B element; microstructure; compressive properties; hardness; magnetic properties
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Funding
- National Natural Science Foundation of China [51134013, 51104029, 51471044]
- Fundamental Research Funds for the Central Universities, China
- Key Laboratory of Basic Research Projects of Liaoning Province Department of Education, China [LZ2014007]
- Natural Science Foundation of Liaoning Province, China [2014028013]
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The influences of slight amount of B element on the microstructure and properties of AlCoCrFeNiBx high entropy alloys (x = 0, 0.01,..., 0.09 and 0.1, mole fraction) were investigated. The AlCoCrFeNi high entropy alloy exhibits equiaxed grain structures with obvious composition segregation. However, with the addition of B element, the alloys exhibit dendrite structures. Inside the dendrites, spinodal decomposition structure can be clearly observed. With the addition of B element, the crystal structures change from (B2 + BCC) to (B2 + BCC + FCC) structures, and the hardness firstly increases from HV 486.7 to HV 502.4, then declines to HV 460.7 (x >= 0.02). The compressive fracture strength firstly shows a trend of increasing, and then declining (x >= 0.08). The coercive forces and the specific saturation magnetizations of the alloys decrease as B addition contents increase, the decreasing coercive forces show a better soft magnetic behavior.
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