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"Hihara, Lloyd H"
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Environmental degradation of advanced and traditional engineering materials
\"From metals and polymers to ceramics, natural materials, and composites, this book covers the environmental impacts on a broad range of materials used for the engineering of infrastructure, buildings, machines, and components all of which experience some form of degradation. The text discusses fundamental degradation processes and presents examples of degradation under various environmental conditions. It gives the fundamental principles for each class of material, followed by detailed characteristics of degradation for specific alloys of compositions, guidelines on how to protect against degradation, and a description of testing procedures\"-- Provided by publisher.
Book
Electrochemical and mechanical behaviors of dissimilar friction stir welding between 5086 and 6061 aluminum alloy
The electrochemical behavior and mechanical properties of friction stir welded AA5086 and AA6061 Al alloys were investigated. Micro-hardness measurements and tensile tests showed that the heat-affected zone (HAZ) in AA6061 had minimum hardness value (i.e., 88 HV) and served as failure site in the dissimilar weld. Corrosion testing revealed that the minimum value of Icorr appeared in the HAZ 5086 (0.54 uA/cm2) and HAZ 5086 was most resistant to corrosion. The AA 5086 side of the weld showed better corrosion resistance than the AA 6061 side.
Paper
Microstructure, mechanical properties and corrosion of friction stir welded 6061 Aluminum Alloy
The microstructure, mechanical properties, and corrosion behavior of friction stir welded (FSW) AA6061 aluminum alloys were investigated. Dynamic recrystallized structures were observed and grain sizes of nugget zone (NZ), thermomechanically-affected zone (TMAZ), heat-affected zone (HAZ), and base material (BM) were different. Hardness test indicated that the minimum and maximum hardness values wereobtained in the HAZ and BM, respectively. Tensile results showed that fracture occurred in the relatively weak regions in between TMAZ and HAZ. Polarization tests illustrated that the FSW process improved the corrosion resistance of AA6061-AA6061 and the HAZ had better corrosion resistance than other regions. Raman characterizations revealed that aluminum hydroxide was the main corrosion product formed on Al after immersion experiments. Intergranular attack was observed in the NZ and downside by scanning electron microscopy.
Paper
A study on the mechanical property and corrosion sensitivity of an AA5086 friction stir welded joint
The mechanical property and corrosion sensitivity of a friction stir welded (FSW) AA5086 joint have been investigated. Vickers microhardness and tensile tests showed that the TMAZ/HAZ zone had the lowest microhardness value and the tensile specimen (transverse to the weld) failed in this region. Polarization experiments conducted using samples cut from each zone indicated that the HAZ had the lowest corrosion rate in 3.15 wt.% NaCl. SEM observation of the samples, Raman spectroscopic and XRD characterization of the corrosion products, and weight loss analysis after immersion tests all showed that the corrosion severity of AA5086 decreased from 3.15% NaCl to ASTM seawater and finally to 0.5 M Na2SO4. In addition, less corrosion products were observed from HAZ as compared to the other three regions, which was in agreement with the Raman and XRD analyses.
Paper