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Meeting Materials Science & Technology 2020
Symposium Microstructure and Physical Property Optimization in High Entropy Alloys
Presentation Title 3D Twinning in High Entropy Alloys
Author(s) Scott X. Mao, Zhengwu Fang
On-Site Speaker (Planned) Zhengwu Fang
Abstract Scope The combination of high strength and high ductility is hard to attain in metallic materials. However, materials that show twinning-induced plasticity are exceptional. To understand the intrinsic mechanisms by which the usual strength-ductility trade-off can be defeated, we apply quantitative in situ transmission electron microscopy (TEM) to examine deformation twinning in CrMnFeCrNi and CrCoNi that exhibits one of the highest combinations of strength, ductility and toughness on record. A three-dimensional (3D) hierarchical twin network is formed when the alloy is deformed that serves a dual function: conventional twin boundary (TB) strengthening involving blockage of dislocations impinging on the TB, coupled with the high-density network of twins which offers additional pathways for dislocation motion by gliding along the TB-matrix interfaces.


3D Twinning in High Entropy Alloys
Hierarchical Eutectoid Nano-lamellar Decomposition in an Al0.3CoFeNi Complex Concentrated Alloy
On the Low Cycle Fatigue Response of CoCrNiFeMn High Entropy Alloy with Ultra-fine Grain Structure
Short-range Atomic Order Drives Exceptional Mechanical Properties of Multi-principal Element Alloys

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