On the superposition of strengthening mechanisms in dispersion strengthened alloys and metal-matrix nanocomposites: Considerations of stress and energy

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• 作者：J. B. Ferguson (1)
  Benjamin F. Schultz (1)
  Dev Venugopalan (1)
  Hugo F. Lopez (1)
  Pradeep K. Rohatgi (1)
  Kyu Cho (2)
  Chang-Soo Kim (1)
  
• 关键词：nanostructured materials ; composites ; strength ; mechanical properties ; yield phenomena
• 刊名：Metals and Materials International
• 出版年：2014
• 出版时间：March 2014
• 年：2014
• 卷：20
• 期：2
• 页码：375-388
• 全文大小：708 KB
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• 作者单位：J. B. Ferguson (1)
  Benjamin F. Schultz (1)
  Dev Venugopalan (1)
  Hugo F. Lopez (1)
  Pradeep K. Rohatgi (1)
  Kyu Cho (2)
  Chang-Soo Kim (1)
  
  1. Materials Science and Engineering Department, University of Wisconsin-Milwaukee, Milwaukee, WI, 53211, USA
  2. Weapons and Materials Research Directorate, Aberdeen Proving, U.S. Army Research Laboratory, Ground, MD, 21005, USA
  
• ISSN：2005-4149

文摘

Yield strength improvement in dispersion strengthened alloys and nano particle-reinforced composites by well-known strengthening mechanisms such as solid solution, grain refinement, coherent and incoherent dispersed particles, and increased dislocation density resulting from work-hardening can all be described individually. However, there is no agreed upon description of how these mechanisms combine to determine the yield strength. In this work, we propose an analytical yield strength prediction model combining arithmetic and quadratic addition approaches based on the consideration of two types of yielding mechanisms; stress-activated and energy-activated. Using data available in the literature for materials of differing grain sizes, we consider the cases of solid solutions and coherent precipitates to show that they follow stress-activated behavior. Then, we applied our model with some empirical parameters to precipitationhardenable materials of various grain sizes in both coherent and incoherent precipitate conditions, which demonstrated that grain boundary and Orowan-strengthening can be treated as energy-activated mechanisms.