Strain Rate Dependency of Bronze Metal Matrix Composite Mechanical Properties as a Function of Casting Technique

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• 作者：Lloyd Brown (1) LBrown@usna.edu
  Peter Joyce (1)
  Joshua Radice (1)
  Dro Gregorian (1)
  Michael Gobble (23)
• 关键词：casting – ; metal matrix composites – ; mechanical testing – ; non ferrous metals
• 刊名：Journal of Materials Engineering and Performance
• 出版年：2012
• 出版时间：July 2012
• 年：2012
• 卷：21
• 期：7
• 页码：1462-1467
• 全文大小：558.6 KB
• 参考文献：1. M. Antler, Electrical Contacts: Principles and Applications, P.G. Slade, Ed., CRC Press, Boca Raton, 1999, p 423–425
  2. M. Braunovic, Electrical Contacts: Principles and Applications, P.G. Slade, Ed., CRC Press, Boca Raton, 1999, p 164–165
  3. P. Joyce, L. Brown, and A. Lazzaro, Mechanical and Material Properties of Metal Matrix Composite Conducting Alloys, Proceedings of the 25th ICE and 56th IEEE Holm Conference, 4-7 October, 2010, in press
  4. MATWEB: Material Property Data, http://matweb.com, 2010
  5. P. Joyce, L. Brown, and A. Lazzaro, Physical and Mechanical Characterization of a Metal Matrix Composite Conductor, Proceedings of the SAMPE Fall Technical Conference, 11-14 October, 2010, in press
  6. G. Gray, Classic Split-Hopkinson Pressure Bar Testing, ASM Handbook, Vol 8, H. Kuhn and D. Medlin, Ed., ASM International, Materials Park, OH, 2000, p 462–476
  7. D. Frew, M. Forrestal, and W. Chen, Pulse Shaping Techniques for Testing Brittle Materials with a Split Hopkinson Pressure Bar, Exp. Mech., 2002, 42, p 93–106
  8. P. Joyce, L. Brown, D. Landen, and S. Satapathy, Measurement of High-Strain-Rate Strength of a Metal-Matrix Composite Conductor, Proceedings of the SEM Annual Conference, Indianapolis, IN, June 7-10, 2010
• 作者单位：1. Mechanical Engineering Department, US Naval Academy, 590 Holloway Road, Annapolis, MD 21402, USA2. United States Marine Corps, Quantico, VA, USA3. MCB, Quantico, 3250 Catlin Avenue, Quantico, VA 22134-5000, USA
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Characterization and Evaluation Materials
  Materials Science
  Tribology, Corrosion and Coatings
  Quality Control, Reliability, Safety and Risk
  Engineering Design
  
• 出版者：Springer US
• ISSN：1544-1024

文摘

Strain rate dependency of mechanical properties of tungsten carbide (WC)-filled bronze castings fabricated by centrifugal and sedimentation-casting techniques are examined, in this study. Both casting techniques are an attempt to produce a functionally graded material with high wear resistance at a chosen surface. Potential applications of such materials include shaft bushings, electrical contact surfaces, and brake rotors. Knowledge of strain rate-dependent mechanical properties is recommended for predicting component response due to dynamic loading or impact events. A brief overview of the casting techniques for the materials considered in this study is followed by an explanation of the test matrix and testing techniques. Hardness testing, density measurement, and determination of the volume fraction of WC particles are performed throughout the castings using both image analysis and optical microscopy. The effects of particle filling on mechanical properties are first evaluated through a microhardness survey of the castings. The volume fraction of WC particles is validated using a thorough density survey and a rule-of-mixtures model. Split Hopkinson Pressure Bar (SHPB) testing of various volume fraction specimens is conducted to determine strain dependence of mechanical properties and to compare the process-property relationships between the two casting techniques. The baseline performances of C95400 bronze are provided for comparison. The results show that the addition of WC particles improves microhardness significantly for the centrifugally cast specimens, and, to a lesser extent, in the sedimentation-cast specimens, largely because the WC particles are more concentrated as a result of the centrifugal-casting process. Both metal matrix composites (MMCs) demonstrate strain rate dependency, with sedimentation casting having a greater, but variable, effects on material response. This difference is attributed to legacy effects from the casting process, namely, porosity and localized WC particle grouping.