Author
Halina Garbacz
Bio: Halina Garbacz is an academic researcher from Warsaw University of Technology. The author has contributed to research in topics: Microstructure & Titanium. The author has an hindex of 19, co-authored 87 publications receiving 1091 citations.
Papers published on a yearly basis
Papers
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TL;DR: In this article, a series of Ti+X alloys (X = Al, Sn, V, Zr and O) were selected to analyze the impact of solute valence structure and lattice site deformation on the mechanisms responsible for variation of mechanical properties.
111 citations
TL;DR: In this paper, the microstructure evolution of the nanostructured Cr/CrN multilayer coatings on titanium Ti6Al4V alloy during indentation was investigated.
Abstract: The aim of the present work was to investigate the microstructure evolution of the nanostructured Cr/CrN multilayer coatings on titanium Ti6Al4V alloy during indentation. Five types of multilayer (Cr/CrN) × 8 coatings were deposited on Ti6Al4V titanium alloy by the PVD vacuum arc method. The coatings had the same total thickness and number of constituent layers, but differed in the thickness ratio of the Cr and CrN constituent layers (QCr/CrN parameter). The indentation measurements were performed with a Berkovich indenter at loads of 100 mN, 500 mN, and 1 N. The SEM and STEM observations were focused on the cracking behaviour in the CrN layers as well as on the microstructure changes in the ductile Cr layers. The investigations demonstrate that the applied surface treatment significantly improves the hardness of the titanium alloy. The hardness of the coatings varied in the range 10 to 35 GPa, depending on the thickness ratio of the layers. Observations performed on cross-sections through the indentation zones revealed small radial cracks, which were observed only in the CrN layers. They initiated at the interface and propagated across a given layer, to be arrested at the next interface. The STEM observations also showed microstructure changes in the Cr layers due to the accommodation of plastic deformation. The two main mechanisms of permanent deformation were observed.
92 citations
TL;DR: In this paper, five different nanostructured, multilayer coatings (CrN/Cr)x8 with different thickness ratio of Cr and CrN layers were deposited by PAPVD (Plasma Assisted Physical Vapour Deposition) vacuum arc method on Ti6Al4V titanium alloy.
59 citations
TL;DR: In this paper, the authors investigated the erosion properties of the nanostructured Cr/CrN multilayer coatings on titanium Ti6Al4V alloy and found that the applied surface treatment significantly improves the erosion resistance of the titanium alloy.
57 citations
TL;DR: In this article, the authors reported the results of studies of wear resistance of nano-titanium Ti-Grade 2 obtained by hydrostatic extrusion and examined the tribological behavior with the pin-on-disc tribometer under various lubricant conditions: in dry sliding contact, in normal saline solution (0.9% NaCl), and in paraffin oil.
53 citations
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TL;DR: High pressure torsion (HPT) is a well-known technique for metal forming as discussed by the authors, where samples are subjected to a compressive force and concurrent torsional straining.
2,499 citations
TL;DR: The current review focuses on state-of-the-art biodegradable bioceramics, polymers, metal alloys and a few implants that employ bioresorbable/biodesgradable materials.
Abstract: Recent progress made in biomaterials and their clinical applications is well known. In the last five decades, great advances have been made in the field of biomaterials, including ceramics, glasses, polymers, composites, glass-ceramics and metal alloys. A variety of bioimplants are currently used in either one of the aforesaid forms. Some of these materials are designed to degrade or to be resorbed inside the body rather than removing the implant after its function is served. Many properties such as mechanical properties, non-toxicity, surface modification, degradation rate, biocompatibility, and corrosion rate and scaffold design are taken into consideration. The current review focuses on state-of-the-art biodegradable bioceramics, polymers, metal alloys and a few implants that employ bioresorbable/biodegradable materials. The essential functions, properties and their critical factors are discussed in detail, in addition to their challenges to be overcome.
273 citations
TL;DR: In this article, the influence of stacking-fault energy (SFE) on microstructural development when processing using high-pressure torsion (HPT) was evaluated using transmission electron microscopy, X-ray diffraction and hardness measurements.
249 citations
TL;DR: In this paper, the authors review the new and unexpected results obtained on dislocation cores from first principles, including the identification of unforeseen stable and metastable cores and the quantitative evaluation of both interaction energies and energy pathways, in pure metals and alloys of different crystallography (FCC, BCC, HCP) as well as semiconductors.
225 citations
TL;DR: In this paper, the authors proposed the strategy of tailoring strain delocalization to evade long-standing strength-ductility trade-off dilemma, where the achieving of strengthductility synergy depends on the delocalizing of localized strains.
197 citations