Concepts on Low Temperature Mechanical Grain Growth

Technical Report · Fri Nov 01 04:00:00 EDT 2013

DOI:https://doi.org/10.2172/1325912· OSTI ID:1325912

Sharon, John Anthony ^[1]; Boyce, Brad Lee ^[1]

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1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States). Metallurgy and Materials Joining Dept.

In metals, as grain size is reduced below 100nm, conventional dislocation plasticity is suppressed resulting in improvements in strength, hardness, and wears resistance. Existing and emerging components use fine grained metals for these beneficial attributes. However, these benefits can be lost in service if the grains undergo growth during the component’s lifespan. While grain growth is traditionally viewed as a purely thermal process that requires elevated temperature exposure, recent evidence shows that some metals, especially those with nanocrystalline grain structure, can undergo grain growth even at room temperature or below due to mechanical loading. This report has been assembled to survey the key concepts regarding how mechanical loads can drive grain coarsening at room temperature and below. Topics outlined include the atomic level mechanisms that facilitate grain growth, grain boundary mobility, and the impact of boundary structure, loading scheme, and temperature.

• Research Organization: Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
• DOE Contract Number: AC04-94AL85000
• OSTI ID: 1325912
• Report Number(s): SAND2013--8121; 587660
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE