The feasibility of achieving improved combinations of strength and toughness in aluminum alloy 2524 through solute enhanced strain hardening SESH) has been explored in this study and shown to be viable. The effectiveness of SESH is directly dependent on the strain hardening rate SHR) of the material being processed. Aluminum alloy 2524 naturally ages to …

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The present dissertation is aimed at investigating the effects of additives on the mechanical properties and machinability of the 220 alloy which is a new Al-2%Cu-1.3% Si-0.4%Mg casting alloy intended for automotive applications. The research involved here was accomplished through two types of study: i) study of mechanical properties； ii) and study of machinability. The …

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Steel media wear has been well studied and quantified； one method of quantification is the Comminution Dynamics Lab’s Total Media Wear model. It combines simulations, abrasion and corrosion experimental trials to determine wear for the components of milling and grinding ores and minerals for the mining industry. Breakage is an important measure of process efficiency, …

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The purpose of this study was to determine the feasibility of electrolytically hydrogenating sodium metaborate (NaBO2) to sodium borohydride (NaBH4). The NaH-NaBO2-NaBH 4 system was investigated by employing the analytical techniques pressure differential thermal analysis, powdered x-radiation diffraction, and gas evolution analysis. Sodium hydride (NaH) and sodium borohydride are miscible with a eutectic temperature of …

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Two of the most widely used aluminum alloys in the aerospace and automotive industries are the 396 and 319 alloys； this may be attributed to ease of casting and their satisfactory ability to meet the requirements imposed by mechanical properties given the fact that the raw material for processing comes mostly from recycled material. These …

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Welding is a multi-faceted procedure of manufacturing and can occur at any point during the creation of a product. Quality issues in welding can have disastrous, or even deadly, consequences. The issue of weld preparation angle is one of several different elements that have a direct correlation on the quality of a welded joint. The …

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Friction Stir Welding is a solid-state joining technology increasingly being applied to aluminum and other alloys in the automotive and aerospace industry due to its advantages in microstructure and mechanical properties over conventional welding techniques. To further enhance the mechanical properties of the weld, post-weld solution heat treatment (PWSHT) is one option. Previous research has …

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The brittle fracture behaviour for a range of microstructures in a low-carbon, microalloyed pipeline steel is investigated. Each microstructure consists of conventional bainite and features a different prior austenite grain structure PAGS) and Charpy impact toughness. The microstructures were characterized using conventional optical and scanning electron microscopy. Quantitative data, including the PAGS and bainitic packet …

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Aluminum alloys, such as Al 6061-T6 and Al 7075-T6, are widely used in industry due to their high strength to weight ratio and good mechanical properties. The corrosion of these alloys, however, is an expensive and critical problem since the alloys are susceptible to pitting and crevice corrosion in marine environments. The most significant environmental …

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The rates of liquid copper oxidation and reduction plays an important role in the separation of impurities from copper during fire refining. However, the importance of the different factors affecting the rate of oxygen uptake by liquid copper and the rate of reduction with combustion gases is not clear. In this investigation, both oxidation and …

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