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

The specific heat of a melt-textured-growth Y0.8Ca0.2Ba2Cu3Oy crystal has been measured from 100 to 70 K in an applied magnetic field up to 9 T and from 30 to 2 K in a magnetic field up to 4 T, respectively. The abnormal electronic specific heat near Tc can be simulated correctly by the London model, indicating that there is a coexistence of the quasiparticles and the Cooper pairs in the mixed state. The field-induced specific heat CDOS at low temperature (T<5 K) behaves as αT2 in zero field and AT(μ0H)1/2 in nonzero fields, which is well-known evidence for d-wave paring. The values of the Sommerfeld constant γn and the upper critical field μ0Hc2(0) deduced from the specific heat near Tc are consistent with that at low temperature (T<5 K).

Specific heat characteristics near Tc and low temperature in MTG Y0.8Ca0.2Ba2Cu3Oy crystals

For vegetation parameter inversion, the single baseline polarimetric SAR interferometry (POLinSAR) technique, such as the three-stage method and the ESPRIT algorithm, is limited by the observed data with the minimum ground to volume amplitude ration, which effects the estimation of the effective phase center for the vegetation canopy or the surface, and thus results in the underestimated vegetation height. In order to remove this effect of the single baseline inversion techniques in some extend, another baseline POLinSAR data is added on vegetation parameter estimation in this paper, and a dual baseline POLinSAR technique for the extraction of the vegetation parameter is investigated and improved to reduce the dynamic bias for the vegetation parameter estimation. Finally, the simulated data and real data are used to validate this dual baseline technique.

https://earth.esa.int/workshops/polinsar2009/participants/180/paper_180_p1_1zhan.pdf

Vegetation Parameter Extraction Using Dual Baseline Polarimetric SAR Interferometry Data

TiAlW alloy is investigated by transmission electron microscopy. There are beta precipitates at the lamellar interface after aging heat treatment. beta precipitate is a bcc structure. The orientation relationship between beta and gamma phase is (101)gamma//(111)beta, (11 1)gamma//(110)beta. When the incident electron beam is along [111]gamma, six different P phase variants are observed. The long axis directions of P precipitates are discussed according to reciprocal space 0 Lattice model. The predictions from the model are in good agreement with the experimental observations. (c) 2005 Elsevier B.V. All rights reserved.

Reciprocal space analysis of β phase precipitates in a TiAlW alloy

chinese acad sci, inst met res, state key lab rsa, shenyang 110015, peoples r china.;zhang, qs (reprint author), chinese acad sci, inst met res, state key lab rsa, shenyang 110015, peoples r china

Crystallization of mechanically alloyed amorphous Zr-Al-Ni-Cu-Ag alloy

In a previous paper, we reported an investigation of the microstructure ahead of the crack tip induced during indentation at room temperature of GaAs single crystal and found that the crack tip is not atomically sharp. Dislocations may be activated around the crack tip under stress and these lead to a transformation from a crystalline lattice to a disordered structure, forming an amorphous band between crack walls. It is proposed that the crack propagation is a result of decohesion by the amorphous band, rather than sequential rupture of cohesive bonds. Here we present an HREM investigation of the atomic structure at the crack tip, including fast Fourier transformations (FFTs) and inverse fast Fourier transformations (IFFTs) performed on selected areas near the crack tip. The observations and analysis further confirm that the crack tip is not atomically sharp, and that the deformation is anisotropic along different crystalline planes.

H.F. Zhang

Papers

Specific heat characteristics near Tc and low temperature in MTG Y0.8Ca0.2Ba2Cu3Oy crystals

Vegetation Parameter Extraction Using Dual Baseline Polarimetric SAR Interferometry Data

Reciprocal space analysis of β phase precipitates in a TiAlW alloy

Crystallization of mechanically alloyed amorphous Zr-Al-Ni-Cu-Ag alloy

Atomic structure and deformation behaviour around the crack tip induced during indentation of GaAs single crystal