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3D printed ultrastrong and ductile alloy developed by UMass Amherst and Georgia Tech

A team of researchers from UMass Amherst and Georgia Tech have 3D printed a dual-phase, nanostructured high-entropy alloy that they say exceeds the strength and ducility of other state-of-the-art additively manufactured materials. ....

United States , Owen Chen , Jie Ren , University Of Massachusetts , Manufacturing Laboratory , Georgia Tech , Assistant Professor , Industrial Engineering , Ting Zhu , Mechanical Engineering , Multiscale Materials , 3d Printing , 3d Printing News , Additive Manufacturing , Georgia Institute Of Technology , High Entropy Alloy , Oliver Johnson ,

"Temperature-dependent tensile properties of ultrafine-grained C-doped " by Yan Zhong Tian, Si Yuan Peng et al.

Metallic materials can be strengthened by various kinds of plastic deformation strategies. However, the deformed materials suffer poor ductility and thermal stability due to the high-density defects. In this work, we prepared fully recrystallized ultrafine-grained (UFG) 1%C-CoCrFeMnNi high-entropy alloy (C-HEA) through cold rolling and annealing process. Quasi-static tensile tests were performed at temperatures between 77 and 823 K. Deformation microstructures of the samples after tensile tests were characterized, and deformation mechanisms were discussed. There is a transition of deformation mechanisms from twinning and dislocation slip to dislocation slip and grain boundary sliding with temperature increasing. The UFG C-HEA exhibits balanced strength and ductility from the cryogenic temperature to high temperatures, indicating highly adaptive microstructure and mechanical properties. The strength and uniform elongation of the UFG C-HEA decrease monotonously with temperature increasin ....

High Entropy Alloy , Ltrafine Grain ,

"Nano-coupled heterostructure induced excellent mechanical and tribolog" by Yushan Geng, Hui Tan et al.

Abstract
High strength, ductile and wear-resistant alloys are required for engineering applications. This work reports a good combination of mechanical and tribological properties in (NiAl) (FeCr) Co high-entropy alloys (HEAs) via adjusting A2/B2 nano-coupled heterostructure. The A2/B2 heterostructure switches from weave to network structure by increasing x:y ratio from 1:1.3 to 1:1, and eventually forms an island structure when x:y ratio is 1.3:1. Concurrently, the grain boundary FCC phase transforms from continuous to discontinuous as its fraction decreases. The island-like A2/B2 heterostructure provides (NiAl) (FeCr)Co HEA a good compressive yield strength of 1.7 GPa and plasticity of 23.4%. Additionally, (NiAl) (FeCr)Co HEA has the promising wear-resistance from room temperature to 800 °C, ascribing to its excellent strength and the protective tribo-layer at high temperatures. x y (x+y)/2 1.3 1.15 1.3 1.15 ....

Nial Fecr Co , Heterogeneous Structure , High Entropy Alloy , Trength Plasticity Synergy , Tribological Behaviors ,