Severe distortion is one of the four core effects in single phase high entropy alloys (HEAs) and contributes significantly to the yield strength. However, the connection between the atomic scale lattice distortion and macro scale
The serrated flow, which is characterized by fluctuations in the stress strain curve, is associated with plastic deformation that can degrade material properties. This presentation will give an overview of past and current theoretical modeling
Dr. Liaw graduated from the Chiayi High School, obtained his B.S. in Physics from the National Tsing Hua University, Taiwan, and his Ph.D. in Materials Science and Engineering from Northwestern University, USA, in 1980.
Glasses are complex, metastable materials which exist in a variety of thermodynamic states. Electron nanodiffraction probes these materials at the length scales that control their properties and processes. Temporal variations in nanodiffraction
Structural defects in crystalline materials have been well acknowledged as the major parameters to optimize materials’ properties. Controlling and tuning these imperfections can lead to marked improvements in their functional properties. The atomic-scale
The microstructural design of materials is an important criterion to tailor the properties of materials. The hierarchical design of microstructures and control over the local chemical composition of materials give rise to far superior mechanical, physical
High entropy alloys (HEAs) are a class of metallic materials that have revolutionized alloy design. They are known for their high compressive strengths, often greater than 1 GPa; however, the tensile strengths of most reported HEAs are limited. We report
High temperature degradation of metallic materials may occur by different mechanisms, e.g., oxidation in air, accelerated corrosion under fused salt films (“hot corrosion”), etc. Two broad approaches are available to combat these problems:
The relative abundance and high specific strength of aluminum has contributed to its prominence as a structural material for use in the aerospace and automotive industries. However, usages of aluminum as an engineering material has been limited
In this presentation, I will first review briefly the history of the development of high entropy alloys. I will, then, discuss questions associated with each of the “four core effects” – high entropy, sluggish diffusion,lattice distortion, and cocktail
