Synthesis, Characterization and Cold Workability of Cast Copper-Magnesium-Tin Alloys

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• 作者：Agustín Eduardo Bravo Bénard (1)
  David Martínez Hernández (1)
  José Gonzalo González Reyes (2)
  Armando Ortiz Prado (1)
  Rafael Schouwenaars Franssens (1)
  
• 刊名：Metallurgical and Materials Transactions A
• 出版年：2014
• 出版时间：February 2014
• 年：2014
• 卷：45
• 期：2
• 页码：555-562
• 全文大小：1,062 KB
• 作者单位：Agustín Eduardo Bravo Bénard (1)
  David Martínez Hernández (1)
  José Gonzalo González Reyes (2)
  Armando Ortiz Prado (1)
  Rafael Schouwenaars Franssens (1)
  
  1. Departamento de Materiales y Manufactura, Facultad de Ingeniería, Edificio O, Universidad Nacional Autónoma de México, Avenida Universidad 3000, 04510, Mexico, DF, Mexico
  2. Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Circuito Exterior, Ciudad Universitaria, Coyoacán, 04510, Mexico, DF, Mexico
  
• ISSN：1543-1940

文摘

The use of Mg as an alloying element in copper alloys has largely been overlooked in scientific literature and technological applications. Its supposed tribological compatibility with iron makes it an interesting option to replace Pb in tribological alloys. This work describes the casting process of high-quality thin slabs of Cu-Mg-Sn alloys with different compositions by means of conventional methods. The resulting phases were analyzed using X-ray diffraction, scanning electron microscopy, optical microscopy, and energy dispersive X-ray spectroscopy techniques. Typical dendritic α-Cu, eutectic Cu2Mg(Sn) and eutectoid non-equilibrium microstructures were found. Tensile tests and Vickers microhardness show the excellent hardening capability of Mg as compared to other copper alloys in the as-cast condition. For some of the slabs and compositions, cold rolling reductions of over 95 pct have been easily achieved. Other compositions and slabs have failed during the deformation process. Failure analysis after cold rolling reveals that one cause for brittleness is the presence of casting defects such as microshrinkage and inclusions, which can be eliminated. However, for high Mg contents, a high volume fraction of the intermetallic phase provides a contiguous path for crack propagation through the connected interdendritic regions.