Appendix 2

This appendix gives an idea of the intermetallic compounds/intermediate phases and metallic glasses obtained in various equiatomic and nonequiatomic HEAs. The HEAs have been grouped according the nature of the major intermetallic/intermediate phase observed in them.

Table A2.1

B2 Phase in HEAs

CompositionProcessing RouteMajor PhaseMinor PhaseReference
AlCrFeNiIMBCCB2Singh and Subramaniam (2014)
AlCoCrCuNi AM B2 FCC Hsu et al. (2007)
AlCoCrCuNi AM BCC B2 Munitz et al. (2013)
AlCoCrFeNi AM BCC B2 Hsu et al. (2013a)
AlCoCrFeNi AM B2 – Wang et al. (2008)
AlCoCrFeNi IM B2 σ Manzoni et al. (2013b)
AlCoCrFeNi SC B2 – Qiao et al. (2011)
AlCoCrFeNi BS B2 – Zhang et al. (2012b)
AlCoCrFeNi Electro-spark deposition B2 – Li et al. (2013c)
AlCoCuFeNi IM FCC1 FCC2+B2 Singh and Subramaniam (2014)
AlCoCrNiW GTAW cladding B2 W Lin and Cho (2008)
AlCoCrCuFeNi AM B2 FCC Hsu et al. (2007) and Zhang et al. (2010b)
AlCoCrCuFeNi IM B2+BCC+FCC Cu Shaysultanov et al. (2013)
AlCoCrCuFeNi LENS B2 BCC Welk et al. (2013)
AlCoCrFeNiTi AM B2 BCC+FCC Zhang et al. (2009a)
AlCoCrFeNiTi MA B2 FCC Zhang et al. (2010c)
Al0.3CoCrFeNi AM FCC B2 Shun and Du (2009)
AlxCoCrFeNi (x=1–3) AM B2 – Li et al. (2010a)
AlxCoCrFeNi AM x=0.5–0.7: FCC B2 Wang et al. (2014b)
x=0.9–1.8: B2 –
AlxCoCrFeNi AM x=0.875–1.25: FCC B2 Kao et al. (2009)
x=1.5–2: FCC B2
AlxCoCrFeNi (x=1.5–3) AM B2 – Li et al. (2009)
Al2CoCrFeNi AM B2 – Lucas et al. (2011) and Chen and Kao (2012)
Al3CoCrFeNi Laser cladding B2 FCC Zhang et al. (2010a)
Al2CrCuFeNi2 AM and SC BCC B2 Ma et al. (2013b)
AlxCrCuFeNi2 (x=0.2–2.5) IC x≥0.8: BCC+B2 FCC Guo et al. (2013b)
AlCrFeMoxNi AM x=0–0.5: BCC B2 Dong et al. (2013a)
x=0.8–1.0: B2+FCC σ
Al0.3CrFe1.5MnNi0.5 TIG overlay BCC B2 Hsieh et al. (2009)
AlxCoCrCuFeNi AM x>1: B2 BCC+FCC Tong et al. (2005b)
AlxCoCrCuFeNi Sputtering x=0.5–2.5: B2 FCC+BCC Yeh et al. (2004a)
x>2.8: B2 BCC
Alx(CoCrFeMnNi)100−x AM x>16: B2 – He et al. (2014)
AlxCoCrCuFeNi MA x=2.5,5: B2 FCC Sriharitha et al. (2013)
Al2CoCrCuFeNi AM B2 – Wu et al. (2006)
Al2CoCrFeNiSi Laser RSP B2 BCC Zhang et al. (2011a)
AlCoCrFeNiTi0.5 IM B2 BCC Yu et al. (2013)
Al0.5CoCrCuFeNiTix AM x=0–0.6: FCC+B2 BCC Chen et al. (2006b)
AlCrFeMo0.5NiSiTi AM B2 FCC1+FCC2 Huang et al. (2004)
AlCoCrFeMo0.5NiSiTi AM B2+FCC1 FCC2 Huang et al. (2004)

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Table A2.2

L12 Phase in HEAs

CompositionProcessing RouteMajor PhaseMinor PhaseReference
AlCoCrFeNiAMB2L12Li et al. (2008b)
Al0.5CoCrCuFeNi AM FCC L12 Hemphill et al. (2012)
Al0.5CoCrCu0.5FeNi2 IM FCC L12 Manzoni et al. (2013a)

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Table A2.3

Sigma (σ) Phase in HEAs

CompositionProcessing RouteMajor PhaseMinor PhaseReference
CrFe1.5MnNi0.5AMFCCσLee et al. (2008a) and Tsai et al. (2013c)
AlCoCrFeNi IM B2 σ Manzoni et al. (2013b)
Al0.5CoCrNiTi0.5 AM BCC+B2+FCC σ Lee and Shun (2013)
AlCrFeMoxNi AM x=0.8–1.0: B2+FCC σ Dong et al. (2013a)
Al0.3CrFe1.5MnNi0.5 AM BCC+FCC σ Tsai et al. (2013c,d)
AlxCrFe1.5MnNi0.5 AM x=0.3: FCC+BCC σ Tsai et al. (2013c)
x=0.5: BCC σ
CoCrCuFeMn IC FCC1+FCC2 σ Otto et al. (2013b)
CrFeMnNiTi IC FCC σ, Laves Otto et al. (2013b)
CoFeMnNiV IC FCC σ Otto et al. (2013b)
CrFeMoTiW Laser cladding BCC σ Zheng et al. (2013)
CoCrFeNiMox AM x=0.5: FCC σ Shun et al. (2012a)
x=0.85: FCC σ
CoCrFeMo0.85Ni AM FCC σ Shun et al. (2013)
AlxCoCrFeMo0.5Ni AM x=0–0.5: FCC σ Hsu et al. (2013a,b)
x=1–1.5: BCC σ
AlCoxCrFeMo0.5Ni AM x=0.5–1.5: BCC σ Hsu et al. (2010b)
x=2: BCC+FCC σ
AlCoxCrFeMo0.5Ni AM x=0–1.5: BCC+B2 σ Hsu et al. (2013a)
x=2: BCC+B2+FCC σ
AlCoCrxFeMo0.5Ni AM x=0–2: BCC+B2 σ Hsu et al. (2011, 2013a)
AlCoCrFexMo0.5Ni AM x=0.6–2: BCC+B2 σ Hsu et al. (2010a, 2013a)
AlCoCrFeMo0.5Nix AM x=0, 0.5, 1: B2 σ Juan et al. (2013)
AlCoCrFeMoxNi AM x=0.5–0.9: BCC+B2 σ Hsu et al. (2013a)
AlCoCrFeMoNix AM x=0–1: BCC+B2 σ Hsu et al. (2013a)
x=1.5–2: BCC+B2+FCC σ
Al0.5CoCrCuFeNiVx (x=0.6–1) AM FCC+BCC σ Chen et al. (2006a)
Co1.5CrFeNi1.5Ti0.5Mox AM FCC x>0.1: σ Chou et al. (2010b)
CoCrCuFeMnNiTiV AM BCC+FCC σ Zhang et al. (2008a)

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Table A2.4

Laves Phase in HEAs

CompositionProcessing RouteMajor PhaseMinor PhaseReference
CoCrFeNiTixAMx=0.5: FCCLaves+σShun et al. (2012b)
CoCuyFeNiTix AM FCC1 (Cu rich)+FCC2 (Co rich)+BCC (β-Ti rich) x>3/5: Laves Mishra et al. (2012)
CoCuyFeNiTix SC FCC1+FCC2 x/y=1: Laves Samal et al. (2014)
CrFeMnNiTi IC FCC σ, Laves Otto et al. (2013b)
AlCoCrFeNiTix AM BCC1+BCC2 x=3: Laves Zhang et al. (2008a)
AlxCoCrFeNiTi AM x=0.5: B2+BCC+FCC Laves Zhang et al. (2009a)
AlCoCrFeNbxNi (x=0.25–0.75) AM BCC Laves Zhang et al. (2012c)
AlCoCrFeNbxNi (x=0.25–0.75) SC BCC Laves Ma and Zhang (2012)
AlCoCrFeNiTi0.5 SC BCC Laves Qiao et al. (2011)
AlxCoCrFeNiTi0.5 AM x=0.5–0.8: FCC+BCC Laves Dong et al. (2013b)
AlCrCuFeNiTi AM BCC1+BCC2 Laves Pi et al. (2011)
CoFeMnTixVyZrz (x=0.5–2.5, y=0.4–3, z=0.4–3) AM C14 Laves – Kao et al. (2010)
CrFeNiTiVZr LENS C14 Laves α-Ti Kunce et al. (2013)
CrMo0.5NbTa0.5TiZr AM BCC1+BCC2 Laves Senkov et al. (2012b, 2013c)
CrMo0.5NbTa0.5TiZr AM BCC1+BCC2+FCC Laves Senkov and Woodward (2011)

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Table A2.5

Other Intermetallic Compounds in HEAs

CompositionProcessing RouteMajor PhaseMinor PhaseReference
CoFeNiTiAMFCCOrdered HCPTsau et al. (2009)
AlCrSiTiVLaser claddingBCC(Ti,V)5Si3, Al8(V,Cr)5Huang et al. (2011)
AlxCo1.5CrFeNiTiy AM x=0, y=0.5: FCC (Ni,Co)3Ti Chuang et al. (2011)
x=0, y=1: FCC (Ni,Co)3Ti
x=0.2, y=1: FCC (Ni,Co)3Ti
AlCoCuFeNiZr SC BCC+FCC ZrFe3Al Zhuang et al. (2013)
AlCuMgMnZn IM HCP Quasicrystal Li et al. (2011)
(AlCuMnZn)100−xMgx AM x=20: HCP Al–Mn quasicrystal Li et al. (2010b)
x≠20, HCP Al–Mn quasicrystal, Mg, Mg7Zn3

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Table A2.6

Typical Strong HE Nitride and HE Carbide Films

HE Nitrides and CarbidesHardness (GPa)Young’s Modulus (GPa)Reference
(AlCrTaTiZr)N36360Lai et al. (2006a)
(AlCrMoSiTi)N 35 325 Chang et al. (2008)
(AlCrSiTiV)N 31 300 Lin et al. (2007)
(AlBCrSiTi)N 25 260 Tsai et al. (2012)
(AlCrNbSiTiV)N 42 350 Huang and Yeh (2009)
(AlMoNbSiTaTiVZr)N 37 350 Tsai et al. (2008a)
(AlCrTaTiZr)C 40 303 Yeh et al. (2012)
(CrNbSiTiZr)C 33 360 Yeh et al. (2012)

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Table A2.7

HEA Metallic Glasses

CompositionProcessing RouteReference
Equiatomic Substitution Alloys
(TiZrHf)60(NiCu)40ICMa et al. (2002)
(TiZrHf)50(NiCu)40Al10 MA Zhang et al. (2003)
(TiZrHf)65(NiCu)27.5Al7.5 MeS Kim et al. (2006c, 2007)
(TiZrHf)x(NiCu)90−xAl10 MeS Cantor et al. (2002), Zhang et al. (2003), and Kim et al. (2003b,c, 2007)
(TiZrNb)x(CuNi)90−xAl10 MA Zhang et al. (2007)
(TiZrHf)100−x−y(NiCu)xAly MeS Kim et al. (2003a, 2004)
(TiZrHf)x(NiCuAg)90−xAl10 MeS Cantor et al. (2002), Kim et al. (2003b), and Kim (2005)
(TiZrHfNb)90−x(NiCu)xAl10 MeS Kim et al. (2003b, 2006a,b)
(TiZrHfNb)90−x(NiCuAg)xAl10 MeS Kim et al. (2003b)
(CuNiPdPt)80P20 Flux water quenching Takeuchi et al. (2011)
(CuNiPd)60(TiZr)40 MeS Takeuchi et al. (2013b)
(TiZr)40(CuNi)40Be20 AM Ding and Yao (2013)
Equiatomic Alloys
HfNbZr Co sputtering Nagase et al. (2012)
BeCoMgTi MA Chen et al. (2010b)
AlBFeNiSi MA Wang et al. (2014a)
AlCrNiSiTi MaS Chen et al. (2005a)
AlCrTaTiZr MaS Chang et al. (2011) and Hsueh et al. (2012)
AlDyErNiTb IM Gao et al. (2011)
BeCoMgTiZn MA Chen et al. (2010b)
BiCoFeMnNi Electro deposition Yao et al. (2008)
CaMgSrYbZn IM Gao et al. (2011) and Li et al. (2013b)
NbSiTaTiZr MaS Yang et al. (2009) and Tsai et al. (2011)
AlBFeNbNiSi MA Wang et al. (2014a)
AlCrTaTiZrRu MaS Chang et al. (2011)
AlMoNbSiTaTiVZr MaS Tsai et al. (2008b)
Nonequiatomic Alloys
AlCoCu0.5Ni MA Chen et al. (2009d,e)
AlCoCrCu0.5Ni MA
AlCoCrCu0.5FeNi MA
CaCu0.5MgSrYbZn0.5 IM Gao et al. (2011)
CaSrYb(Li0.55Mg0.45)Zn IM
AlCoCrCu0.5FeNiSi SC Chen et al. (2005d)
AlCoCrCu0.5FeNiSi AM Chen et al. (2005b)
AlCoCrCu0.5FeNiTi MA Chen et al. (2009d,e)
AlCoCrFeCu0.5MoNiTi MA

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AM, arc melting; IM, induction melting; IC, injection casting; SC, suction casting; BS, Bridgman solidification; MeS, melt spinning; LENS, laser engineered net shaping; MA, mechanical alloying; MaS, magnetron sputtering.

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