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<div style="font-family:'Segoe UI',Helvetica,Arial,sans-serif"><span id="docs-internal-guid-86d1851e-9600-8d8e-733d-c5fa57d08efb"><span id="docs-internal-guid-9e838874-b9fd-c26f-7292-368ffed344e3">
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<span style="font-size: 28pt; font-family: 'Times New Roman'; color: rgb(192, 0, 0); font-weight: 700; vertical-align: baseline; white-space: pre-wrap;">Fall 2017 Colloquium</span></p>
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<span style="font-size: 16pt; font-family: 'Times New Roman'; font-weight: 700; vertical-align: baseline; white-space: pre-wrap;">Department of Physics & Astronomy</span></p>
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<span style="font-size: 16pt; font-family: 'Times New Roman'; color: rgb(192, 0, 0); font-weight: 700; vertical-align: baseline; white-space: pre-wrap;">9/28, Thursday, 4-5 PM in Science Building 127</span></p>
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<span style="font-size: 14pt; font-family: 'Times New Roman'; vertical-align: baseline; white-space: pre-wrap;">(coffee and cookies will be served at 3:50 PM)</span></p>
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<span style="font-size: 14pt; font-family: 'Times New Roman'; color: rgb(0, 176, 80); font-weight: 700; vertical-align: baseline; white-space: pre-wrap;">Nuclear Engineering / Nuclear Physics</span></p>
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<span style="font-size: 16pt; font-family: 'Times New Roman'; color: rgb(0, 0, 255); font-weight: 700; vertical-align: baseline; white-space: pre-wrap;">Applications of Ion Accelerators in Nuclear Materials Science</span><span style="font-size: 18pt; font-family: 'Times New Roman'; color: rgb(0, 0, 255); font-weight: 700; vertical-align: baseline; white-space: pre-wrap;"><br class="kix-line-break">
</span><span style="font-size: 14pt; font-family: 'Times New Roman'; font-weight: 700; vertical-align: baseline; white-space: pre-wrap;">Dr. Lin Shao</span></p>
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<span style="font-size: 12pt; font-family: 'Times New Roman'; font-weight: 700; vertical-align: baseline; white-space: pre-wrap;">Department of Nuclear Engineering - Texas A&M University - College Station
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<div style="text-align: center;"><img src="https://lh5.googleusercontent.com/vyCKlbjz3NXPRil0-kxeR3DHV70QJ1dcymZEFv-u5idqjztf5L3ej8HOF70QWfTexlA0m1goDEIxj9l0GTguNC1Cuj1JrN_pztiGbU_a_EL5asO5glB_jBoaunbLyqH3uyCu7EXW" width="147" height="183" style="border: none; transform: rotate(0rad); -webkit-transform: rotate(0rad);"></div>
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<span style="font-size: 11pt; font-family: 'Times New Roman'; vertical-align: baseline; white-space: pre-wrap; background-color: rgb(255, 255, 255);">Dr. Lin Shao earned BS (1997) in Nuclear Physics at Peking University (China), and a Ph.D degree (2001) in
Physics at the University of Houston. His Ph.D research topic was defect engineering in silicon. He worked as Director Postdoctoral Fellow at Los Alamos National Laboratory for studying hydrogen induced cracking in solids. In 2004, Dr. Shao joined Texas A&M
University as Assistant Professor. He is now Professor and Director of Ion Beam Laboratory. Dr. Shao’s primary research interests are radiation materials science and the development of damage resistant materials. He has published over 200 journal papers, and
holds 6 U.S. patents. More information about his research can be found at </span><a href="https://urldefense.proofpoint.com/v2/url?u=http-3A__engineering.tamu.edu_nuclear_people_shao-2Dlin&d=DwMF-g&c=oqyuZuih6ykib6aKiBq22_bich4AVfYGoLertJN0bEc&r=hjwEO_XYlnwAQWUGeaCrW47w4mK-Al28-BKyRvaivBs&m=tYAEptbJBKAquH0vOXoBa6FobDviDntE3A9xup9D79E&s=g1i_GvnWaQQeHaX-jpgom4n-erBNlCZwJjVsWu1rR0A&e=" style="text-decoration:none;"><span style="font-size: 11pt; font-family: 'Times New Roman'; color: rgb(17, 85, 204); text-decoration: underline; vertical-align: baseline; white-space: pre-wrap; background-color: rgb(255, 255, 255);">http://engineering.tamu.edu/nuclear/people/shao-lin</span></a></p>
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<span style="font-size: 12pt; font-family: 'Times New Roman'; font-weight: 700; vertical-align: baseline; white-space: pre-wrap;">Abstract</span></p>
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<span style="font-size: 11pt; font-family: 'Times New Roman'; vertical-align: baseline; white-space: pre-wrap; background-color: rgb(255, 255, 255);">Neutron damage causes severe materials degradation, which limits safety and lifetimes of reactor components.
Testing of various alloys in reactor environments, however, is unable to satisfy the needs from materials screening and materials developments. It is well known that currently fast reactors cannot accumulate more than 20 dpa (displacements per atom) per year
in iron-base structural alloys. Currently available mixed-spectrum reactors (HFIR, ATR) in the USA cannot accumulate more than 10 dpa per year and usually less. On the other hand, next generation reactors require materials to survive at >400 dpa. The international
radiation materials community has turned its attention to charged particle simulation techniques at vastly accelerated dpa rates as surrogates for evaluation of new alloy concepts and candidates, especially with respect to void swelling and irradiation creep.
The various neutron-atypical artifacts preclude, however, an exact one-to-one ion-neutron comparison for confident near-exact prediction of swelling in a neutron environment. Claims were frequently made that predictive capability was possible, but such claims
were never validated and should be taken with a grain of salt. In this talk, the most important "reactor-atypical" characteristics or "artifacts" of charged particle irradiation will be discussed. Such major artifacts include defect imbalance, flux effect
and temperature shifting. After that, we will report our recent finding on nano-grained alloys, as examples of many on-going projects at Texas A&M University.
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