期刊
ENTROPY
卷 18, 期 3, 页码 -出版社
MDPI
DOI: 10.3390/e18030102
关键词
refractory high entropy alloy; superalloy; microstructure and phase analysis; mechanical properties
资金
- ONS through the Air Force on-site contract [FA8650-15-D-5230]
- NSF-MRI [DMR-0420532]
- ONR-DURIP [N00014-0400798, N00014-0610539, N00014-0910781]
- MRSEC program through Northwestern's Materials Research Center [NSF DMR-1121262]
- International Institute for Nanotechnology (IIN)
- State of Illinois, through the IIN
Microstructure, phase composition and mechanical properties of a refractory high entropy superalloy, AlMo0.5NbTa0.5TiZr, are reported in this work. The alloy consists of a nano-scale mixture of two phases produced by the decomposition from a high temperature body-centered cubic (BCC) phase. The first phase is present in the form of cuboidal-shaped nano-precipitates aligned in rows along <100>-type directions, has a disordered BCC crystal structure with the lattice parameter a(1) = 326.9 +/- 0.5 pm and is rich in Mo, Nb and Ta. The second phase is present in the form of channels between the cuboidal nano-precipitates, has an ordered B2 crystal structure with the lattice parameter a(2) = 330.4 +/- 0.5 pm and is rich in Al, Ti and Zr. Both phases are coherent and have the same crystallographic orientation within the former grains. The formation of this modulated nano-phase structure is discussed in the framework of nucleation-and-growth and spinodal decomposition mechanisms. The yield strength of this refractory high entropy superalloy is superior to the yield strength of Ni-based superalloys in the temperature range of 20 degrees C to 1200 degrees C.
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