Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/120413
Title: EFFECT OF INTERPHASE, THERMAL INDUCED DISLOCATIONS AND PRESENCE OF VOIDS ON THE FLOW STRESS OF METAL MATRIX NANOCOMPOSITES
Authors: LIN KUNPENG
Keywords: Metal matrix nanocomposites, interphase regions, thermal induced dislocations, voids, discrete dislocation simulation, flow stress
Issue Date: 30-Sep-2014
Citation: LIN KUNPENG (2014-09-30). EFFECT OF INTERPHASE, THERMAL INDUCED DISLOCATIONS AND PRESENCE OF VOIDS ON THE FLOW STRESS OF METAL MATRIX NANOCOMPOSITES. ScholarBank@NUS Repository.
Abstract: Interphase, thermal induced dislocations and presence of voids alter the mechanical properties of metal matrix composites (MMCs) but the extent of their effects in MMNCs are not well understood and are investigated using two-dimensional discrete dislocation simulations. While load-bearing effect account for the strengthening in MMCs, it underestimates the strengthening in MMNCs due to a significant missing contribution from impediment of dislocation motion by the nanoparticles. The presence of the interphase can increase the flow stresses by about 50% due to the resistance to dislocation motion in the interphase. The newly generated dislocations are also hindered by thermal induced dislocations and form pile-ups. This further accounts for up to 45% increase in flow stress and degree of hardening. The simulations can account for the effect of the voids observed in the experiments and showed that their distributions can lead to 40% differences in flow stress under 2% tensile strain.
URI: http://scholarbank.nus.edu.sg/handle/10635/120413
Appears in Collections:Ph.D Theses (Open)

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