Preternatural Hexagonal High-Entropy Alloys: A Review

Rui-Xuan Li, Jun-Wei Qiao, Peter K. Liaw, Yong Zhang

Table 4 Currently developed single-phase HCP alloys and alloys with HCP structure as the main phase

Published year	Composition	Structure	c/a	References
2013	Co₂₅Os₂₅Re₂₅Ru₂₅	HCP (predicted)	None	[16]
2014	Y₂₀Gd₂₀Tb₂₀Dy₂₀Lu₂₀	HCP + OMP	1.574	[17]
2014	Gd₂₀Tb₂₀Dy₂₀Tm₂₀Lu₂₀	HCP + OMP	1.574	[17]
2014	Ho₂₀Dy₂₀Y₂₀Gd₂₀Tb₂₀	HCP	1.579	[18, 30]
2014	Al₂₀Li₂₀Mg₂₀Sc₂₀Ti₂₀	HCP (annealing)	1.588	[37]
2015	Co₂₅Fe₂₅Re₂₅Ru₂₅	HCP	1.581	[29]
2015	Co₂₅Re₂₅Ru₂₅V₂₅	HCP + OMP	1.606	[29]
2016	Sc_16.67Y_16.67La_16.67Ti_16.67Zr_16.67Hf_16.67	Dual HCP	1.583/1.575	[33]
2016	Gd₂₀Ho₂₀La₂₀Tb₂₀Y₂₀	HCP	1.589	[31]
2017	Al₁₅Hf₂₅Sc₁₀Ti₂₅Zr₂₅	HCP + OMP	1.585	[67]
2017	Ir₁₉Os₂₂Re₂₁Rh₂₀Ru₁₉	HCP	1.590	[32]
2017	Gd₂₀Dy₂₀Er₂₀Ho₂₀Tb₂₀	HCP	1.578	[49]
2017	Co₂₀Cr₂₀Fe₂₀Mn₂₀Ni₂₀	HCP (high pressure)	1.620	[34, 35]
2017	Co₂₀Cr₂₆Fe₂₀Mn₂₀Ni₁₄	HCP (high pressure torsion)	1.620	[36]
2017	Fe₅₀Mn₃₀Co₁₀Cr₁₀	HCP + FCC	1.616	[38]
2018	Ce₂₀Gd₂₀Tb₂₀Dy₂₀Ho₂₀	HCP + OMP	1.588	[68]
2018	Er_16.67Gd_16.67Ho_16.67La_16.67Tb_16.67Y_16.67	HCP	1.578	[43]
2019	Ir₂₆Mo₂₀Rh_22.5Ru₂₀W_11.5	HCP	1.601	[56]
2019	Ir_25.5Mo₂₀Rh₂₀Ru₂₅W_9.5	HCP	1.598	[56]