Energetically favorable dislocation/nanobubble bypass mechanism in irradiation conditions
نویسندگان
چکیده
With exposure to high-energy particle irradiation, structural metals develop a number of nanoscale defects, one which is the nano-sized He bubble. Formed throughout material, these bubbles can directly impair movement dislocations and dramatically alter mechanical performance. Propagating edge in face-centered cubic metals, driven under sufficient forces, are expected cut through bubbles, due higher energetic expense. Here, using atomistic simulations for model Cu we find that when He-vacancy ratio bubble diameter become sufficiently large spacing reduced below threshold, an extended dislocation engages multi-step-bypass (MSB) maneuver change its glide plane overcome at room temperature. This unanticipated MSB mechanism provides more energetically favorable pathway compared conventional bypass mechanisms severe conditions.
منابع مشابه
High Concentrations of H2O2 Make Aerobic Glycolysis Energetically More Favorable for Cellular Respiration
Since the original observation of the Warburg Effect in cancer cells, over 8 decades ago, the major question of why aerobic glycolysis is favored over oxidative phosphorylation has remained unresolved. An understanding of this phenomenon may well be the key to the development of more effective cancer therapies. In this paper, we use a semi-empirical method to throw light on this puzzle. We show...
متن کاملFavorable Plug Shape of an Aerospike Nozzle in Design, Over and Under Expansion Conditions
The influence of the plug shape on the performance of an aerospike nozzle thrust force is studied in different back pressure conditions. To generate smooth plug contours, Cubic B-Spline technique is employed. In the current research, basis functions are obtained using Deboor’s relation. The flow field around the aerospike nozzle is investigated implementing various shapes and the best of the ge...
متن کاملVoluntary dehydration in runners despite favorable conditions for fluid intake.
This study investigated the relationship between runners' perceptions of fluid needs and drinking behavior under conditions of compensable heat stress (ambient temperature = 20.5 +/- 0.7 degrees C, 68.9 degrees F; relative humidity = 76.6%). Eighteen experienced runners (15 men, 40.5 +/- 2.5 y, and 3 women, 42 +/- 2.3 y) were given ad libitum access to a sports drink (6% carbohydrate-electrolyt...
متن کاملEnergetically Autonomous Robots
EcoBot I is a robot developed in the IAS Lab that uses Microbial Fuel Cells (MFC) as the ‘live engine’ and glucose as the fuel. This prototype robot employs no other form of conventional power supply and it proves the concept of autonomy whilst at the same time performing photo-taxis. Recent experiments conducted in our lab, employing two different techniques, have suggested that the power outp...
متن کاملEnergetically Optimal Action Potentials
Most action potentials in the nervous system take on the form of strong, rapid, and brief voltage deflections known as spikes, in stark contrast to other action potentials, such as in the heart, that are characterized by broad voltage plateaus. We derive the shape of the neuronal action potential from first principles, by postulating that action potential generation is strongly constrained by t...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Acta Materialia
سال: 2022
ISSN: ['1873-2453', '1359-6454']
DOI: https://doi.org/10.1016/j.actamat.2022.117849