Topic
Alloy
About: Alloy is a research topic. Over the lifetime, 171884 publications have been published within this topic receiving 1719420 citations. The topic is also known as: alloys.
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TL;DR: The phase composition of micro-arc oxidized coatings has been examined using X-ray diffraction, scanning electron microscopy, and Xray photoelectron spectroscopy as discussed by the authors.
Abstract: The coating deposition mechanism of aluminum alloys by means of micro-arc oxidation has been investigated, which may be adapted to the further application of wear resistant protection of Al alloys. The phase composition of the micro-arc oxidized coatings has been examined using X-ray diffraction, scanning electron microscopy and X-ray photoelectron spectroscopy. The antiwear behavior of the coatings was evaluated with a scratch tester, reciprocating tester and Timken tester. The results show that the micro-arc oxidized coatings on Al alloys show two distinct regions, i.e. a porous overlayer region consisting predominantly of γ-Al2O3 which was produced at the higher cooling rate, and a dense internal region consisting predominantly of α-Al2O3 which was generated at the lower cooling rate. They are well bonded on the Al substrate in 40–110 μm coatings. The polished coating mainly composed of α-Al2O3 registers a lower wear of 3.00–5.00×10−6 mm3/N m in reciprocating sliding against ceramic counterpart at a speed of 0.33 m/s and a contact pressure of 2 MPa. The antiwear life of the polished coating reached 2500 m at a speed of 1.25 m/s and load of 300 N and the friction coefficient was more than 0.45 against the steel ring in a Timken tester. Thus, the micro-arc oxidation coating mainly composed of α-Al2O3 could be a promising candidate as a protective coating of Al alloy-based components in terms of wear-resistance, and further improved lubrication effects as a self-lubrication coating or using oil, grease and solid lubrication films.
170 citations
TL;DR: In this article, the effect of solute content on the pitting potential of Al-Cu alloys in 1M NaCl solutions was studied, and it was found that the maximum pitting value was limited by the solubility of Cu in the Al.
170 citations
11 Nov 2015-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this paper, a set of novel non-equiatomic multi-component CoCrFeMnNi alloys produced by metallurgical rapid alloy prototyping is presented, which exhibits a strong resemblance to the well-studied equiatomic single phase HEA.
Abstract: The high entropy alloy (HEA) concept has triggered a renewed interest in alloy design, even though some aspects of the underlying thermodynamic concepts are still under debate This study addresses the short-comings of this alloy design strategy with the aim to open up new directions of HEA research targeting specifically non-equiatomic yet massively alloyed compositions We propose that a wide range of massive single phase solid solutions could be designed by including non-equiatomic variants It is demonstrated by introducing a set of novel non-equiatomic multi-component CoCrFeMnNi alloys produced by metallurgical rapid alloy prototyping Despite the reduced configurational entropy, detailed characterization of these materials reveals a strong resemblance to the well-studied equiatomic single phase HEA: The microstructure of these novel alloys exhibits a random distribution of alloying elements (confirmed by Energy-Dispersive Spectroscopy and Atom Probe Tomography) in a single face-centered-cubic phase (confirmed by X-ray Diffraction and Electron Backscatter Diffraction), which deforms through planar slip (confirmed by Electron-Channeling Contrast Imaging) and leads to excellent ductility (confirmed by uniaxial tensile tests) This approach widens the field of HEAs to non-equiatomic multi-component alloys since the concept enables to tailor the stacking fault energy and associated transformation phenomena which act as main mechanisms to design useful strain hardening behavior
170 citations
TL;DR: Producing near net shape components with graded compositions using LENS could potentially be a viable route for manufacturing unitized structures for metal-on-metal prosthetic devices to minimize the wear-induced osteolysis and aseptic loosening that are significant problems in current implant design.
170 citations
TL;DR: Amorphous and nanocrystalline Mg-based alloys were produced by rapid quenching (melt-spinning) and their hydrogenation properties were studied as discussed by the authors.
170 citations