A5043991695- Metal and Thin Film Mechanics
- Semiconductor materials and devices
- Diamond and Carbon-based Materials Research
- Advanced ceramic materials synthesis
- Advanced materials and composites
- GaN-based semiconductor devices and materials
- Advanced Surface Polishing Techniques
- Advanced machining processes and optimization
- Metal Alloys Wear and Properties
- Microstructure and Mechanical Properties of Steels
- Intermetallics and Advanced Alloy Properties
- MXene and MAX Phase Materials
- Copper Interconnects and Reliability
- High Entropy Alloys Studies
- Boron and Carbon Nanomaterials Research
- Zeolite Catalysis and Synthesis
- High-Temperature Coating Behaviors
- Metallurgical and Alloy Processes
- Mathematical and Theoretical Epidemiology and Ecology Models
- Evolution and Genetic Dynamics
- Electronic and Structural Properties of Oxides
- Integrated Circuits and Semiconductor Failure Analysis
- Thermal properties of materials
- Ferroelectric and Piezoelectric Materials
- Semiconductor materials and interfaces
Linköping University
2003-2021
Uppsala University
2011
Finding a wear resistant coating for cemented carbide cutting tools in the machining of difficult to cut Ti alloys is challenge due their high strength and chemical reactivity. Tool manufacturers recommend physical vapor deposited (PVD) TixAl1-xN (x = 0.4–0.7), an extra NbN overlayer has shown promising potential. This study explores mechanisms PVD Ti0.45Al0.55N with without its WC-Co substrate alloys. To achieve accurate understanding tool-chip-workpiece interaction related mechanisms,...
The wear behavior of TiAlN coatings during turning stainless steel 316L at low cutting speeds (60–120 m/min) was investigated using scanning electron microscopy. In this speed range, the fail by fracture due to an adhesive mechanism. coating is described in detail, including strong influence Al-content and on rate wear. Low (x ≤ 0.23) showed worse resistance than high ≥ 0.53) samples. Less substrate exposed when increased, because reduced TiN Ti0.77Al0.23N are severely worn for all while...
Radio frequency sputtering has been used to deposit α-alumina (α-Al2O3) thin films at substrate temperatures of 280–560 °C. The are shown be single phased and hard. Nanoindentation gives values 306±31 27±3 GPa for elastic modulus hardness, respectively, a temperature 280 Growth the α phase was achieved by in situ predeposition chromia template layer. Chromia crystallizes same hexagonal structure as α-alumina, with lattice mismatch 4.1% a- 4.6% c-parameter, is nucleate readily on amorphous...
Reciprocating sliding wear tests were performed on TiAlN coating against 316L stainless steel and carbide-free bainitic at temperatures of 40, 400 800 °C. The results indicate that material transfer is more pronounced for the softer lower but °C, bainite exhibits relatively transfer. Friction coefficient increases when temperature increases. However, bainite, there a reduction in friction elevated temperatures. This can be attributed to formation an easily sheared iron oxide layer In case...
The influence of the aluminium content (x) on crater wear mechanisms Ti1-xAlxN coated WC-Co inserts in high-speed turning 316L stainless steel was investigated. Electron microscopy and energy dispersive X-ray spectroscopy were used to characterize behaviour. coatings with x ≤ 0.53 showed, after 1/3 tool life, a thick adhered layer composed oxides metallic species from steel, no diffusion workpiece material into coating. These presented best resistance least abrasive wear. high Ti0·38Al0·62N...
The ion flux obtained during reactive magnetron sputtering of an Al target in Ar∕O2 gas mixtures was studied by energy-resolved mass spectrometry, as a function the total and O2 partial pressures. positive ions film-forming species exhibited bimodal energy distributions, both for direct current radio frequency discharges, with higher most likely originating from sputtered neutrals. For negative oxygen high-energy peak observed, corresponding to formed at surface accelerated towards substrate...
The interactions of Al, O, and ${\mathrm{O}}_{2}$ with different $\ensuremath{\alpha}\text{\ensuremath{-}}{\mathrm{Al}}_{2}{\mathrm{O}}_{3}\phantom{\rule{0.3em}{0ex}}(0001)$ surfaces have been studied using ab initio density functional theory methods. All three surface terminations obtainable by cleaving the bulk structure [single Al-layer $(\mathrm{AlO})$, double $(\mathrm{AlAl})$, O terminations] considered, as well a completely hydrogenated O-terminated surface. Adsorbed Al shows strong...
This study investigates the wear of W- and Mo-alloyed Ti1-x-yAlxMeyN coatings (Me = W, Mo) with x ≈ 0.55 y 0.10 during high-speed turning stainless steel 316L. A difference in crater rate was observed between TiAlN coatings. The behavior sliding area is characterized detail for two different regions by scanning transmission electron microscopy energy dispersive X-ray spectroscopy. thin adhered layer constituted elements from workpiece material on top all coatings, followed diffusion species...
Non-metallic inclusions offer one of the most effective routes for improving machinability steels. However, wear-reducing mechanisms activated by such are not fully understood. The interactions notoriously difficult to predict due wide variety steel grades, cutting conditions, and tool materials employed in industry. interaction between PVD (Ti,Al)N coated cemented carbide tools, non-metallic inclusions, atmospheric oxygen, stainless 316L a turning operation is therefore investigated here as...
It is of high fundamental and practical importance to be able control the formation stability different crystalline phases alumina (Al2O3). In this study, we have used density functional theory methods investigate changes induced in thermodynamically stable α phase metastable θ as one eighth Al atoms are substituted for additives (Sc, W, Mo, Cr, Cu, Si, B). The calculations predict that strongly affect relative between two phases. Most tested shown shift towards, some cases completely...