Abstract In this study the effect of three different nickel concentration on microstructure, hardness and corrosion properties high entropy alloys (HEAs) from AlCrFeCoNi system as an alternative material for medical instruments fabrication was investigated. The analyzed HEAs were AlCrFeCoNix obtained by vacuum arc remelting purity raw materials having atomic ratio x = 1.0, 1.4 1.8. microscopy examination revealed dendritic morphology reference alloy (AlCrFeCoNi) that extent interdendritic...

There is an increased interest in high entropy alloys as a result of the special possibilities improving mechanical, physical or chemical characteristics resulting from metallic matrices made different elements added equimolar proportions. The next step developing new to determine cutting conditions optimize manufacturing prescriptions. This article presents series tests performed estimate machining behavior Al0.6CoCrFeNi alloy. effects temperature during machining, wear on tool, evolution...

Considering the future trends of biomaterials, current studies are focused on corrosion resistance and mechanical properties new materials that need to be considered in process strengthening alloys with additive non-toxic elements. Many kinds titanium different biocompatible elements (Mo, Si, Zr, etc.,) have been recently developed for their similar human bone. Four were obtained investigated regarding microstructure, mechanical, chemical, biological behavior (in vitro vivo evaluation), as...

Ti-based alloys are widely used in medical applications. When implant devices to reconstruct disordered bone, prevent bone resorption and enhance good remodeling, the Young's modulus of implants should be close that bone. To satisfy this requirement, many titanium with different biocompatible elements (Zr, Ta, Mo, Si etc.) interact well adjacent tissues, promoting an adequate osseointegration. Four new were obtained investigated regarding their microstructure, mechanical, chemical biological...

High-entropy alloys are novel metallic materials distinguished by very special mechanical and chemical properties that superior to classical alloys, attracting high global interest for the study development thereof different applications. This work presents creation characterisation of an FeMoTaTiZr high-entropy alloy composed constituents with relatively low biotoxicity human use, suitable medical tools such as surgical scissors, blades, or other cutting tools. The microstructure is...

The aim of the paper is to study Zr addition effect on mechanical properties and corrosion behavior a high-entropy alloy from CoCrFeMoNi system. This was designed be used for components in geothermal industry that are exposed high temperature corrosion. Two alloys, one Zr-free (named Sample 1) another doped with 0.71 wt.% 2), were obtained vacuum arc remelting equipment high-purity granular raw materials. Microstructural characterization quantitative analysis by SEM EDS performed. Young...

In this paper, a new TaMoNbTiZr multielement alloy has been designed, using chemical elements that exhibit extremely low bio-toxicity for the human body. The was obtained by melting in vacuum arc remelting (VAR) equipment MRF ABJ 900 from high-purity (99.5%) as mini-ingots having about 40 g weight each. biocompatible alloys underwent changes hardness after performing annealing at °C 2 h, followed cooling water. had an average cast state of 545 HV0.5, and heat treatment, it hardened to value...

Special materials are required in many applications to fulfill specific medical or industrial necessities. Biodegradable metallic present attractive properties, especially mechanical ones correlated with good biocompatibility vivant bodies. A biodegradable iron-based material was realized through electric arc-melting and induction furnace homogenization. The new chemical composition obtained presented a special property named SME (shape memory effect) based on the martensite transformation....

AlFeCrCoNi high entropy alloys (HEA) feature significant compressive strength characteristics, being usable for severe impact applications in the military domain. The research paper presents results obtained by testing resistance of four HEA samples different chemical compositions at perforation with 7.62 mm calibre incendiary armour-piercing bullets. dynamical behaviour was modelled numerical simulation based on dynamic tests conducted firing range, thus allowing development more efficient...

Lightweight complex concentrated alloys (LWCCA), composed of elements with low density, have become a great area interest due to the high demand in large number applications. Previous research on LWCCAs was focused entropy multicomponent alloy systems that provide density and capability solid solution formation. Present introduces two (Al-Cu-Si-Zn-Mg Al-Mn-Zn-Mg-Si) contain readily available inexpensive starting materials potential for formation structures. For selection appropriate...

Stainless steels, commercial as well with special properties, are the principal metallic materials used for medical devices manufacturing. steels should have superior mechanical as: hardness, wear resistance, tensile strength, elongation, fracture toughness, creep resistance etc. This paper aims to present experimental researches regarding obtaining in vacuum arc remelting device (VAR) of austenitic and martensitic stainless their characterization from microstructure microhardness point view.

The structure, composition and corrosion properties of thin films synthesized using the Pulsed Laser Deposition (PLD) technique starting from a three high entropy alloy (HEA) AlCoCrFeNix produced by vacuum arc remelting (VAR) method were investigated. depositions performed at room temperature on Si mirror-like polished Ti substrates either under residual (low 10-7 mbar, denoted HEA2, HEA6, HEA10, which grown targets with Ni concentration molar ratio, x, equal to 0.4, 1.2, 2.0, respectively)...

High entropy alloys (HEA) are metallic materials obtained from a mixture of at least five atomic-scale chemical elements. They characterized by high mechanical strength, good thermal stability and hardenability. AlCrFeCoNi have compression strength tensile values 2004 MPa, respectively 1250 MPa elongation about 32.7%. These can be used to create HEA-steel type composite structures which resist dynamic deformation during speed impacts. The paper presents four different made combination HEA...

The AlCrFeCoNi high entropy alloy exhibits unexpected properties that can be obtained after mixing five different elements, which could not from any one independent element. difference to conventional alloys is these may have, at the same time, both hardness and plasticity, used in severe impact applications. In order study influence of aluminum content on microhardness microstructure AlxCrFeCoNi (x: atomic ratio, x= 0.2 2.0) nine types samples were as mini-sized ingots (50x15x9.5 mm 40 g...

Brazing is a joining process used to obtain heterogeneous assemblies between different materials, such as steels, irons, non-ferrous metals, ceramics etc. Some application, like asphalt cutters, require quick solutions dissimilar joints at acceptable costs, given the very short period of operation these parts. This paper presents some results obtained during brazing steel and tungsten carbide by using types Ag-Cu system filler materials alloyed with P Sn. The techniques were oxygen-gas flame...

Many high entropy alloy systems have been exploited in the past decade and among them AlCrFeCoNi is widely studied. The structural mechanical properties of AlCr x FeCoNi was studied this paper for different content chromium (atomic ratio, x= 0.2 to 2.0 at. %). In study, ten samples having chemical composition were prepared from raw materials using RAV equipment, type MRF ABJ 900. microstructure features, crystallite sizes microhardness depends on alloy. values (x = 2 %) increases 389.6 562.6...

The β-Ti alloys have attracted the attention of researchers due to their excellent properties and remarkable biocompatibility. present study evaluated mechanical behavior analysis (hardness, compressive strength, modulus elasticity) Ti-15Mo-W system. For experimental research, we chose TiMo15 biocompatible alloy as a starting material. In order improve properties, added tungsten amounts 3.88 12.20 wt.% analyzed results obtained. successive melting samples was done using vacuum arc furnace in...

The paper presents the microstructure and corrosion behavior of an AlTiNiCuAgSn new equiatomic multicomponent alloy. alloy was obtained using vacuum arc remelting (VAR) technique in MRF-ABJ900 equipment. microstructural analysis performed by optical scanning electron microscopy (SEM microscope, SEM-EDS) phase transformations were highlighted dilatometric differential thermal (DTA). results show that as-cast is three-phase, with average microhardness 487 HV0.1/15. could be included group...

Magnesium alloys have applications in aerospace and medical as biodegradable orthopedic implants. Alloying with biocompatible elements, such calcium or zirconium contribute to refining the microstructure improves corrosion resistance formation of an eutectic compound - Mg2Ca at boundary alpha-Mg grains. The purpose this paper is present throw optical scanning electron methods phase constituents identification X-ray analysis. results showed presence grains a mechanical appearance alpha- Zr...