宣講人：國際處 張老師 研究生院 姜老師、楊老師
何洋 北京科技大學特聘教授 原位透射電子顯微技術在材料科學基礎問題中的應用
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 mechanical properties thro ugh experimental verifications has yet to be fully achieved, owing to two critical challenges: (1) the difficulty in the development of homogeneous single phase solid solution HEAs and (2) the ambiguity in describing the lattice distortion and related meas urements and calculations. We have developed the single
Recently, exceptional properties that are continuously found in an intriguing new class of metallic structural materials, high entropy alloy s (HEAs), demonstrate their great potential for engineering applications particularly in extreme environments where conventional alloys reach their limits. The concept of HEAs has revolutionized traditional alloy design in particular i n terms of their endl ess composition space, which meanwhile brings a new challenge of how to effectively design HEAs with targeted properties. Here we focus on the design of advanced precipitate
The serrated flow, which is characterized by fluctuations in the stress strain curve, is associated with plastic deformation that can degrad e material properties. This presentation will give an overview of past and current theoretical modeling and analysis techniques used to study the serrated flow phenomenon in different alloy systems, including high entropy alloys (HEAs).
In this presentation, I will briefly highlight the research activities on bulk metallic glasses (BMG), high entropy alloys (HEAs), and other structural materials by our group members and collaborators. I am most grateful that many wonderful students and friends have greatly and graciously help and formulate our research activities. It is truly a great pleasure for me to learn from and interact with our students and friends on research, papers and proposal writings.