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<p class="Body" align="center" style="text-align:center"><b><span style="font-size: 16pt; font-family: 'Times New Roman'; ">Ph.D. Defense</span></b><b><span style="font-size: 16pt; font-family: 'Times New Roman'; "><o:p></o:p></span></b></p>
<p class="Body" align="center" style="text-align:center"><b><span style="font-size: 12pt; font-family: 'Times New Roman'; "> </span></b></p>
<p class="Body" align="center" style="text-align:center"><span style="font-size: 12pt; font-family: 'Times New Roman'; ">Molecular Dynamics Study of Radiation
and Creep Response of Nanotwinned FCC Metals</span><span style="font-size: 12pt; font-family: 'Times New Roman'; "><o:p></o:p></span></p>
<p class="Body" align="center" style="text-align:center"><span style="font-size: 12pt; font-family: 'Times New Roman'; "> </span></p>
<p class="Body" align="center" style="text-align:center"><span style="font-size: 12pt; font-family: 'Times New Roman'; ">Shuyin Jiao</span><span style="font-size: 12pt; font-family: 'Times New Roman'; "><o:p></o:p></span></p>
<p class="Body" align="center" style="text-align:center"><span style="font-size: 12pt; font-family: 'Times New Roman'; ">Department</span><span lang="ZH-CN" style="font-size: 12pt; font-family: 'Times New Roman'; "> of Mechanical Engineering</span><span style="font-size: 12pt; font-family: 'Times New Roman'; "><o:p></o:p></span></p>
<p class="Body" align="center" style="text-align:center"><span style="font-size: 12pt; font-family: 'Times New Roman'; "> </span><span style="font-size: 12pt; font-family: 'Times New Roman'; "><o:p></o:p></span></p>
<p class="Body"><b><span style="font-size: 12pt; font-family: 'Times New Roman'; ">Date</span></b><span style="font-size: 12pt; font-family: 'Times New Roman'; ">: Wednesday, July
8, 2015, <b>Time</b>: 1:30</span><span style="font-size: 12pt; font-family: 'Times New Roman'; "><o:p></o:p></span></p>
<p class="Body"><b><span style="font-size: 12pt; font-family: 'Times New Roman'; ">Location</span></b><span style="font-size: 12pt; font-family: 'Times New Roman'; ">: ME Large
Conference Room</span><span style="font-size: 12pt; font-family: 'Times New Roman'; "><o:p></o:p></span></p>
<p class="Body"><b><span style="font-size: 12pt; font-family: 'Times New Roman'; ">Committee
members</span></b><span style="font-size: 12pt; font-family: 'Times New Roman'; ">:
Dr. Yashashree Kulkarni (Chair), Dr. Pradeep Sharma, Dr. Mo Li, Dr. Ken White,
Dr. Ashutosh Agrawal</span><span style="font-size: 12pt; font-family: 'Times New Roman'; "><o:p></o:p></span></p>
<p class="Body"><span style="font-size: 12pt; font-family: 'Times New Roman'; "> </span></p>
<p class="Body"><b><span lang="DE" style="font-size: 12pt; font-family: 'Times New Roman'; ">Abstract</span></b><b><span style="font-size: 12pt; font-family: 'Times New Roman'; "><o:p></o:p></span></b></p>
<p class="Body"><b><span style="font-size: 12pt; font-family: 'Times New Roman'; "> </span></b></p>
<p class="Body"><span style="font-size: 12pt; font-family: 'Times New Roman'; ">Research
over the past decade has provided compelling evidence that nanotwinned
structures</span><span style="font-size: 12pt; font-family: 'Times New Roman'; "> </span><span style="font-size: 12pt; font-family: 'Times New Roman'; ">may be optimal
motifs for the design of high-strength high-ductility materials. This
dissertation</span><span style="font-size: 12pt; font-family: 'Times New Roman'; "> </span><span style="font-size: 12pt; font-family: 'Times New Roman'; ">presents our
atomistic study of the deformation mechanisms governing the radiation
tolerance, high temperature creep, and fracture response of nanotwinned
face-centered cubic (fcc) metals.</span><span style="font-size: 12pt; font-family: 'Times New Roman'; "><o:p></o:p></span></p>
<p class="Body"><span style="font-size: 12pt; font-family: 'Times New Roman'; "> </span></p>
<p class="Body"><span style="font-size: 12pt; font-family: 'Times New Roman'; ">We
employ molecular dynamics (MD) to elucidate the synergistic role of grain
boundaries (GBs)</span><span style="font-size: 12pt; font-family: 'Times New Roman'; "> </span><span style="font-size: 12pt; font-family: 'Times New Roman'; ">and coherent twin
boundaries (CTBs) in the radiation tolerance of nanotwinned Cu. While GBs are
known to be excellent sinks for point defects, CTBs do not absorb point
defects. A beneficial corollary is that the structural integrity of CTBs
remains intact as radiation-induced defects pass</span><span style="font-size: 12pt; font-family: 'Times New Roman'; "> </span><span style="font-size: 12pt; font-family: 'Times New Roman'; ">through
them and get absorbed into GBs. Thus, our tension simulations reveal that
nanotwinned</span><span style="font-size: 12pt; font-family: 'Times New Roman'; "> </span><span style="font-size: 12pt; font-family: 'Times New Roman'; ">metals continue to
exhibit high strength even after being subjected to radiation damage.</span><span style="font-size: 12pt; font-family: 'Times New Roman'; "><o:p></o:p></span></p>
<p class="Body"><span style="font-size: 12pt; font-family: 'Times New Roman'; "> </span></p>
<p class="Body"><span style="font-size: 12pt; font-family: 'Times New Roman'; ">We
also perform atomistic simulations of cyclic nanoindentation to complement
experimental</span><span style="font-size: 12pt; font-family: 'Times New Roman'; "> </span><span style="font-size: 12pt; font-family: 'Times New Roman'; ">studies of cyclic
nano- and micro-indentation, along with indentation creep, on nanotwinned Cu</span><span style="font-size: 12pt; font-family: 'Times New Roman'; "> </span><span style="font-size: 12pt; font-family: 'Times New Roman'; ">and Ag. Taken together, the studies
provide evidence that nanotwinned fcc structures are more stable than their
nanocrystalline counterparts. Inspired by the excellent mechanical stability of</span><span style="font-size: 12pt; font-family: 'Times New Roman'; "> </span><span style="font-size: 12pt; font-family: 'Times New Roman'; ">nanotwinned metals during indentation
creep, we investigate high temperature creep in</span><span style="font-size: 12pt; font-family: 'Times New Roman'; "> </span><span style="font-size: 12pt; font-family: 'Times New Roman'; ">polycrystalline
nanotwinned Cu using MD. The simulations reveal that the nanotwinned metals
exhibit greater creep resistance with decreasing twin boundary (TB) spacing at
all applied</span><span style="font-size: 12pt; font-family: 'Times New Roman'; "> </span><span style="font-size: 12pt; font-family: 'Times New Roman'; ">stresses.
Nanotwinned metals with very high density of TBs exhibit a new creep
deformation mechanism at high stresses governed by TB migration. This is in
contrast to nanocrystalline and nanotwinned metals with larger twin spacing,
which exhibit a more conventional transition from GB diffusion and sliding to
dislocation nucleation. </span><span style="font-size: 12pt; font-family: 'Times New Roman'; "><o:p></o:p></span></p>
<p class="Body"><span style="font-size: 12pt; font-family: 'Times New Roman'; "> </span></p>
<p class="Body"><span style="font-size: 12pt; font-family: 'Times New Roman'; ">Finally,
our investigation of the crack propagation along CTBs in a range of fcc metals
with various crack and sample geometries indicates that the alternating
brittle-ductile behavior of CTBs observed perviously is sensitive to the
material, and crack length.</span><span style="font-size: 12pt; font-family: 'Times New Roman'; "><o:p></o:p></span></p>
<p class="Body"><span style="font-size: 12pt; font-family: 'Times New Roman'; "> </span></p>
<p class="Body"><span style="font-size: 12pt; font-family: 'Times New Roman'; ">In
summary, our results furnish insights into the role of TBs in governing the
remarkable mechanical stability, creep resistance and radiation tolerance of
nanotwinned metals, making them strong candidates for future structural
materials for extreme environments. </span><span style="font-size: 12pt; font-family: 'Times New Roman'; "><o:p></o:p></span></p>
<p class="Body"><o:p> </o:p></p>
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