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Pentagon Reveals 2023 Lab-University Initiative Fellows

Pentagon Reveals 2023 Lab-University Initiative Fellows
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United States , James Delehanty , Jon Simon , Nick Kotov , Caroline Ajo Franklin , William Kennedy , Mitra Taheri , Spencer Olson , Owen Vail , Manoj Kolel Veetil , Patrick Callahan , Ibrahim Boulares , Corey Trahan , Blair Connelly , Mulugeta Haile , Mercedeh Khajavikhan , Bindu Nair , Mark Loveland , Keith Knipling , Dass Chandriker , Meshless Multiphysics , Ahmad Khalil , Steven Rodriguez , Philip Kim , Tanya Tschirhart , Monika Schleier Smith ,

"Yield strength anomaly evaluation of W-free Co-Ni-Al-based superalloys" by Hang Shang, Qingshuang Ma et al.

High temperature tensile behaviors of two W-free Co-Ni-Al-based γ'-strengthened superalloys at 773 K ~ 1073 K were investigated. The tensile strength and elongation of two superalloys decrease with increasing temperature. The fracture mechanism changes from dimple fracture to brittle fracture. A detailed observation of the fracture shows that the intermediate temperature embrittlement caused by decohesion of slip plane plays a significant role in reducing high temperature performance. Both superalloys reach to peak yield strength at 923 K. Occurance of yield strength anomaly (YSA) is derived from the synergistic effects of dislocation locking strengthening and dynamic strain aging strengthening. Dislocation cross-slipping hinders the dislocation migration. Dislocations' unpinning to the moving solutes increases the yield strength at 723 K ~ 973 K. A rapid weakening of grain boundaries strength decreases the yield strength at 1073 K. ....

W Free Co Ni Al Based , Co Ni Al Based Superalloy , Deformation Behavior , Tensile Properties , Ield Strength Anomaly ,

"Size Effect on Deformation Behavior and Fracture in a Pure Copper Micr" by H. M. Zhang, R. Chen et al.

Pure copper specimens 0.1, 0.2, and 0.3 mm thick were annealed at different temperatures. The influence of the size effect on the mechanical properties and fracture behavior of annealed pure copper was investigated in a uniaxial tensile test. The elongation and tensile strength decreased with the grain size at a constant specimen thickness. If the grain size remains constant and its thickness varies, the tensile strength and elongation increase with the specimen thickness. The specimen grain size and thickness can significantly affect the fracture behavior of pure copper. If the grain size is increased and the specimen thickness is reduced, the fracture behavior tends to change from a mixed fracture mode to a slip fracture one. ....

Deformation Behavior , Racture Mechanism , Icrotensile Test , Pure Copper , Size Effect ,