https://dc.engconfintl.org/cgi/viewcontent.cgi?article=1032&context=superalloys_ii

A critical review of high entropy alloys and related concepts

Microstructures and properties of high-entropy alloys

Amorphous alloys were first developed over 40 years ago and found applications as magnetic core or reinforcement added to other materials. The scope of applications is limited due to the small thickness in the region of only tens of microns. The research effort in the past two decades, mainly pioneered by a Japanese- and a US-group of scientists, has substantially relaxed this size constrain. Some bulk metallic glasses can have tensile strength up to 3000 MPa with good corrosion resistance, reasonable toughness, low internal friction and good processability. Bulk metallic glasses are now being used in consumer electronic industries, sporting goods industries, etc. In this paper, the authors reviewed the recent development of new alloy systems of bulk metallic glasses. The properties and processing technologies relevant to the industrial applications of these alloys are also discussed here. The behaviors of bulk metallic glasses under extreme conditions such as high pressure and low temperature are especially addressed in this review. In order that the scope of applications can be broadened, the understanding of the glass-forming criteria is important for the design of new alloy systems and also the processing techniques.

https://www.tcd.ie/Physics/people/Graham.Cross/SF%20Poster%202011/Shek-MaterSciEng04-Bulk%20Metallic%20Glasses.pdf

Bulk metallic glasses

https://www.tcd.ie/Physics/people/Graham.Cross/SF%20Poster%202011/Schuh-ActaMater07-Mechanical%20behaviour%20of%20amorphous%20alloys.pdf

Mechanical behavior of amorphous alloys

https://zenodo.org/record/1258680/files/article.pdf

The influences of temperature and microstructure on the tensile properties of a CoCrFeMnNi high-entropy alloy

http://m03.iphy.ac.cn/Paper/2012/SSC152(2012)1127-M03.pdf

Giant magnetic refrigerant capacity in Ho3Al2 compound

Bulk metallic glasses (BMGs), especially ZrCuAlNi alloys, are important materials due to their very attractive physical and mechanical properties. However, their applications are restricted due to processing limitations and cost effectiveness. Materials scientists are trying to design and synthesize economical BMGs using inexpensive materials with improved properties. In the present study, six alloys having compositions (Zr0.65Cu0.18Ni0.09Al0.08)(100-x)M-x (where M = Y, Ti, Nb, Er and W and x = 0 and 2 at.%) were synthesized by Cu mould casting using 2-3N pure elements. The base alloy Zr65CU18Ni9Al8 was designed following the Inoue's rules and also adopting the criterion of average valance electrons/atom (e/a ratio = 1.3950) and average atomic size R. = 0.1498 nm. Characterization of alloys was done by XRD, differential scanning calorimetry (DSC) and SEWEDS. Maximum AT, was found to be 129 K for the base alloy. Mechanical properties like Vicker's microhardness, nanohardness, elastic modulus, density, fracture strength and shear angles were measured. Enhancement in ductility was achieved by adding Ti and Nb. Microstructure of as-cast and heat-treated compression tested samples was evaluated. (c) 2006 Elsevier B.V. All rights reserved.

Effect of additional elements on mechanical properties of a specially constituted Zr-based alloy

Synthesis and mechanical properties of an amorphous Zr–Ni–Al–Cu alloy

The high quality Er-doping Y0.8Er0.2Ba2Cu3O7−δ (YErBCO) crystal is grown by the melted-textured-growth (MTG) method. The microstructure photograph shows that the MTG-YErBCO crystal has an obvious layered structure. Its magnetization loops show that the irreversibility field is decreased by Er-doping for H//c and that there is an anomalous behaviour, a second peak, in the magnetization curve for H//ab. The critical current density along the ab-plane (Jcab(77 K, 0 T) = 4.75 × 104 A cm−2) is higher than that along the c-axis (Jcc(77 K, 0 T) = 470 A cm−2). The field dependence of the irreversibility temperature Tirr follows a power law, H = H0(1 − Tirr(H)/Tirr(0))1.3, with H0 = 550 T for H//ab and 51 T for H//c, respectively. The field dependence of the activation energy Ue shows a different behaviour for H//ab and for H//c, namely a linear relation, U = 49131–3006H, for H//ab and a power law, U ∝ H−0.68, for H//c, respectively. The anisotropy factor γ = 15 was obtained from the angular dependences of the activation energy and the irreversibility temperature. A possible reason for the effect of Er addition on the flux-pinning behaviour has been discussed.

http://iopscience.iop.org/article/10.1088/0953-2048/15/2/301/pdf

The effect of Er-substitution on the superconducting properties of MTG-YBaCuO crystals

The effects of casting temperature on microstructure and mechanical properties of as-cast 3 mm-diameter Zr(64.9)Al(7.9) Ni(10.7)Cu(16.5) and Zr(47)Cu(37.5)Ag(7.5)Al(8) alloys were investigated. It was found that crystalline phases were precipitated in amorphous matrix as casting temperature increased. The compressive strength and Hv of as-cast Zr(64.9)Al(7.9)Ni(10.7)Cu(16.5) and Zr(47)Cu(37.5)Ag(7.5)AL(8) alloys increased slightly when casting temperature increased. However, ultrahigh casting temperature resulted in formation of hard crystalline phase in metallic glass matrix, which caused increase of hardness and density, but decrease of compressive strength. (c) 2009 Elsevier B.V. All rights reserved.

H.F. Zhang

Papers

Giant magnetic refrigerant capacity in Ho3Al2 compound

Effect of additional elements on mechanical properties of a specially constituted Zr-based alloy

Synthesis and mechanical properties of an amorphous Zr–Ni–Al–Cu alloy

The effect of Er-substitution on the superconducting properties of MTG-YBaCuO crystals

Effects of casting temperature on mechanical properties of Zr-based metallic glasses