Anita Heczel

University of Alabama | UA · Department of Metallurgical and Materials Engineering

This article studies the evolution of microstructure and the wear resistance in tantalum processed by a newly developed Severe Plastic Deformation (SPD) technique called Indirect Extrusion Angular Pressing (IEAP). The microstructure and tribological behavior of nanostructured tantalum processed by IEAP were analyzed in this work. The samples were e...

This research, for the first time, conducted a comprehensive study into the effect of a modern Severe Plastic Deformation technique, “Indirect Extrusion Angular Pressing (IEAP)”, on the microstructural refinement of niobium and the subsequent impact on the tribological properties. The samples were processed for 4, 9, and 12 passes of IEAP and then...

This paper investigates the effects of laser heated cold spray on the microstructure and mechanical properties of cold sprayed 304L stainless steel (SS304L). In this study, three samples were made by depositing SS304L powder onto SS304L substrates using cold spray (CS) with a nitrogen carrier gas. A laser was used to heat the surface of two of the...

A Cu-1.1%Cr-0.04%Zr (wt.%) alloy was processed by severe plastic deformation (SPD) using the equal channel angular pressing (ECAP) technique at room temperature (RT). It was found that when the number of passes increased from one to four, the dislocation density significantly increased by 35% while the crystallite size decreased by 32%. Subsequent...

This study investigates the correlation between the microstructure and the mechanical strength of AM60 magnesium alloy processed by equal channel angular pressing (ECAP) and multi-directional forging (MDF) at a constant temperature of 220 °C. The maximum number of passes was six for both severe plastic deformation (SPD) techniques. The minimum achi...

This research paper presents an analysis of the corrosion properties of steel-reinforced concrete samples during immersion in 3.5 wt. % NaCl aqueous solution by measuring their response both cathodic and anodic polarization in order to determine the corrosion rates in the function of their calcium nitrate inhibitor content. This cheap inorganic inh...

The recrystallization behavior of a well-known non-equiatomic high entropy alloy by the nominal chemical composition of Fe–27Mn–10Cr–10Co, at.% was investigated. The compression tests were performed in the temperature range of 400–1000 °C by the interval of 200 °C under the strain rate of 0.001 s⁻¹. Initial microstructure consist of face centred cu...

An investigation was conducted on aluminum samples (AA1050) to study the microstructure and hardness evolution during processing by High Pressure Torsion Extrusion (HPTE). The equivalent strain accumulated in the samples after one pass of HPTE varied in a wide range between 0.9 and 65.5, depending on the processing parameters. HPTE led to the forma...

A four-component equimolar high-entropy alloy (HEA) with the composition of HfNbTiZr and body-centered cubic (bcc) structure was processed by HPT at RT. The evolution of the dislocation density, the grain size and the hardness was monitored along the HPT-processed disk radius for different numbers of turns between ¼ and 20. It was found that most o...

The present study focuses on the corrosion behavior of a single-phase FCC high entropy alloy (VCrNiCoFeCu) casted by two different methods: induction melting and spark plasma sintering. The corrosion resistance has been evaluated using immersion tests in 3.5% NaCl solution, the potentiodynamic polarization measurements and the results are compared...

This article was originally published Online First without open access. After publication in volume 69, issue 11, page 2107–2112 the author decided to opt for Open Choice and to make the article an open access publication.

(Link to the paper: https://authors.elsevier.com/c/1WmGx_Ky~FZhOY) The effect of the chemical inhomogeneities on the local mechanical behavior was studied in a CoCrFeMnNi high-entropy alloy. Micropillar compression revealed that, despite the difference in the chemical composition, the stress-strain behaviors in the two regions were almost identic...

The effects of V, Cr, and Mn on the magnetic, elastic, and thermal properties of FeCoNiCu high-entropy alloy are studied by using the exact muffin-tin orbitals method in combination with the coherent potential approximation. The calculated lattice parameters and Curie temperatures in the face-centered-cubic structure are in line with the available...

An equiatomic CoCrFeMnNi High-Entropy Alloy (HEA) produced by arc melting was processed by High-Pressure Torsion (HPT). The evolution of the microstructure during HPT was investigated after ¼, ½, 1 and 2 turns using electron backscatter diffraction and transmission electron microscopy. The spatial distribution of constituents was studied by energy-...

The lattice defect structure developed during plastic deformation in a High-Entropy Alloy (HEA) with the composition of Ti35Zr27.5Hf27.5Nb5Ta5 was investigated. The crystallite size as well as the density of dislocations in a disk processed by High-Pressure Torsion (HPT) were determined by X-ray line profile analysis (XLPA). Additional transmission...

The correlation between the strength, ductility and phase structures of two new NiFeCrMoW type alloys is investigated. The ductile or brittle behavior is strongly influenced by the volume fraction of FCC and BCC phases. The results may allow for a concept to optimize the combination of strength and ductility by varying the alloy composition.

High-Pressure Torsion (HPT) is one of the most effective severe plastic deformation techniques in grain refinement. The goal of this study was to investigate the influence of HPT on the microstructure and hardness of a Ti-rich High-Entropy Alloy (HEA). The evolution of the grain size due to 1 turn of HPT was studied by transmission electron microsc...

The microstructure and the mechanical behavior of equimolar Ti20Hf20Zr20Ta20Nb20 high-entropy alloy in a wide range of initial strain rates between ∼ 10- 3 s- 1 and ~ 3.4 × 103 s- 1 were studied. A significant increment in the yield strength with increasing strain rate was observed. The yield strength at ~ 3.4 × 103 s- 1 was about 40% higher than t...