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Since all of these factors are relevant to rail

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Unformatted text preview: ties, refine the microstructures of wrought aluminum alloys, and improve weldability by reducing hot cracking in the weld region. Since all of these factors are relevant to rail applications of aluminum, a study was conducted to establish whether scandium-containing 5xxx, 6xxx, and 7xxx alloys could be used in conjunction with advanced welding technology such as friction stir welding, to improve the performance of aluminum alloys for rail applications.14 While previous studies showed that scandium additions improved weldability of 6061 alloy, this study demonstrated that scandium additions reduced the strength of 6061 and did not refine the grain size. In the case of the 5456 alloy, the addition of scandium did refine the grain structure and improve mechanical properties; however, the intergranular corrosion performance was adversely impacted. In the case of the 7xxx alloy, however, scandium additions did significantly improve mechanical properties, weldability, and corrosion resistance. Because of higher LIGHT METAL AGE, OCTOBER 2007 mec...
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