Showing papers by "Andrej Atrens published in 2010"
TL;DR: In this article, the authors examined the recent literature to further examine the electrochemical measurement hypothesis for Mg and found that the corrosion of Mg alloys can be adequately estimated using Tafel extrapolation of the polarisation curve.
752 citations
TL;DR: Corrosion of Mg-Y alloys using electrochemical evaluations, immersion tests and direct observations was studied in this paper, which revealed that a predominant feature was hydrogen evolution from particular parts of the alloy surface.
280 citations
TL;DR: In this paper, a corrosion mechanism for Al3Mg2 was proposed based on electrochemical tests, XPS, and depth profiling using XPS and ToF-SIMS.
76 citations
TL;DR: Linearly increasing stress tests conducted in 30°C aerated distilled water using as-quenched 4340 and 3.5NiCrMoV turbine rotor steels indicated that stress corrosion cracking occurred at all applied stress rates for 4340 steel, whilst only at applied stress rate less than or equal to 0.002 MPa−s−1 for the turbine rotor steel as discussed by the authors.
50 citations
15 Jul 2010-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this article, the microstructures were documented using light microscopy and scanning electron microscopy (SEM) and the mechanical properties were measured with a tensile-testing machine.
Abstract: This paper studied Ag micro-alloying in the deformation-processed Cu-14Fe in situ composite, by a comparison of Cu-14Fe and Cu-14Fe-0.06Ag. Each alloy was prepared by casting and processed into an in situ composite by hot and cold working. The microstructures were documented using light microscopy and scanning electron microscopy (SEM). The mechanical properties were measured with a tensile-testing machine. The electrical conductivity was measured with a micro-ohmmeter. For both alloys, the as-cast microstructure consisted of a Cu matrix and Fe dendrites; after hot and cold working the microstructure consisted of a Cu matrix containing Fe fibres elongated in the working direction. The as-cast Ag-containing alloy contained finer Fe dendrites. The Ag-containing in situ composite had thinner Fe fibres, higher tensile strength, higher ductility, and higher conductivity. The cold worked Cu-14Fe-0.06Ag in situ composite with cumulative cold deformation strain eta = 7.8 (where eta = In(A(0)/A) and A(0) and A are the original and final cross-section areas, respectively), achieved a tensile strength of 930 MPa and a conductivity of 56%IACS (International Annealed Copper Standard; 17.241 n Omega m is defined as 100%IACS). The Ag micro-alloyed in situ composite had a combination of properties comparable to that of a much more expensive alloy containing much more Ag. After 1 h heat treatment at 300 degrees C, the tensile strength was increased to 950 MPa and the conductivity was increased to 56.4%IACS.
36 citations
TL;DR: In this article, the influence of Ag micro-alloying on the deformation-processed Cu-7Cr in situ composite, by a comparison of Cu and 0.07Ag, was studied.
22 citations
15 Nov 2010-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this paper, the influence of partially replacing Cu by Si in the bulk amorphous alloy Mg30Cu30Y10 was studied using X-ray diffraction and a differential scanning calorimeter.
Abstract: We studied the influence of partially replacing Cu by Si in the bulk amorphous alloy Mg30Cu30Y10. Glass forming ability (GFA), examined using X-ray diffraction and a differential scanning calorimeter, was increased at 1% Si, but decreased for larger Si concentrations. Nano-indentation measured nano-hardness, elastic modulus and load-displacement curves. The elastic modulus and nano-hardness increased with increasing Si content to a maximum at 2.5%. The load-displacement curves during nano-indentation revealed displacement serrations. These increased with decreasing loading rates, decreased with increasing Si content. The load-displacement curves also indicated that these bulk amorphous alloys exhibited primary creep at room temperature just like other high strength alloys. The creep displacement decreased with increasing Si content. (C) 2010 Elsevier B.V. All rights reserved.
3 citations
01 Dec 2010
TL;DR: Corrosion of Mg-Y alloys using electrochemical evaluations, immersion tests and direct observations was studied in this article, where corrosion rate increased with increasing Y content due to increasing amounts of the Y-containing intermetallic.
Abstract: Corrosion of Mg-Y alloys was studied using electrochemical evaluations, immersion tests and direct observations. There were two important effects. In 0.1 M NaCl, the corrosion rate increased with increasing Y content due to increasing amounts of the Y-containing intermetallic. In 0.1 M Na SO , the corrosion rate decreased with increasing Y content above 3%, attributed to a more protective surface film, despite the intermetallic. The corrosion rate evaluated by electrochemical impedance spectroscopy was somewhat smaller than that evaluated from H evolution as expected from the Mg corrosion mechanism.
1 citations