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

Composition	Processing Route	Major Phase	Minor Phase	Reference
AlCrFeNi	IM	BCC	B2	Singh 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)

Table A2.2

L1₂ Phase in HEAs

Composition	Processing Route	Major Phase	Minor Phase	Reference
AlCoCrFeNi	AM	B2	L12	Li et al. (2008b)
Al0.5CoCrCuFeNi	AM	FCC	L12	Hemphill et al. (2012)
Al0.5CoCrCu0.5FeNi2	IM	FCC	L12	Manzoni et al. (2013a)

Table A2.3

Sigma (σ) Phase in HEAs

Composition	Processing Route	Major Phase	Minor Phase	Reference
CrFe1.5MnNi0.5	AM	FCC	σ	Lee 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)

Table A2.4

Laves Phase in HEAs

Composition	Processing Route	Major Phase	Minor Phase	Reference
CoCrFeNiTix	AM	x=0.5: FCC	Laves+σ	Shun 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)

Table A2.5

Other Intermetallic Compounds in HEAs

Composition	Processing Route	Major Phase	Minor Phase	Reference
CoFeNiTi	AM	FCC	Ordered HCP	Tsau et al. (2009)
AlCrSiTiV	Laser cladding	BCC	(Ti,V)5Si3, Al8(V,Cr)5	Huang 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

Table A2.6

Typical Strong HE Nitride and HE Carbide Films

HE Nitrides and Carbides	Hardness (GPa)	Young’s Modulus (GPa)	Reference
(AlCrTaTiZr)N	36	360	Lai 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)

Table A2.7

HEA Metallic Glasses

Composition	Processing Route	Reference
Equiatomic Substitution Alloys
(TiZrHf)60(NiCu)40	IC	Ma 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

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.