2026-09-19T19:06:28Zhttps://dspace.mit.edu/server/oai/requestoai:dspace.mit.edu:1721.1/404242022-01-13T07:54:36Zcom_1721.1_7582com_1721.1_7581col_1721.1_131024
Sidney Yip.
Gandy, David R
Massachusetts Institute of Technology. Dept. of Mechanical Engineering.
Massachusetts Institute of Technology. Department of Mechanical Engineering
2008-02-27T22:23:59Z
2008-02-27T22:23:59Z
2007
2007
http://hdl.handle.net/1721.1/40424
191699745
Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2007.
Includes bibliographical references (p. 24).
In the well-known Hall-Petch behavior, yield and flow stresses in polycrystalline metals increase with a decrease in grain size. As grain size continues to decrease, mechanical strength peaks. As grain size further decreases, mechanical strength begins to decrease. As grain size approaches zero, the total structure is composed of an increasingly high percentage of grain boundaries, which exhibit the properties of an amorphous structure. Molecular dynamics simulations, with the goal of exploring this behavior, were performed on nanocrystalline and amorphous microstructures using the embedded atom potential developed by Mishin et al. A 0.2 shear strain was applied to each of the nanocrystalline and amorphous samples. From these simulations, we have observed the inverse Hall-Petch behavior of nanocrystalline structures. We have also shown that the amorphous structure as zero grain size is reasonable as the limiting case for the inverse Hall-Petch trends in nanocrystalline structures.
by David R. Gandy.
S.B.
24 p.
eng
Massachusetts Institute of Technology
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http://dspace.mit.edu/handle/1721.1/7582
Mechanical Engineering.
Shear deformation of amorphous and nanocrystalline copper microstructures via atomistic simulation
Thesis
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