时间：10月23日（周四）15：00

地点：师昌绪楼403室

Title: When Metals Face Extremes: High Strain Rate Deformation and Shock Response

Bio:

Dr. Ali Arab is an Associate Professor at Shenyang University of Technology, specializing in the behavior of metals and advanced materials under extreme conditions, including high strain-rate deformation, impact, and blast loading. He earned his Ph.D. in Mechanical Engineering from Universiti Sains Malaysia and previously worked at Beijing Institute of Technology. His research covers titanium and high-entropy alloys, explosion-welded materials, and advanced fabrication techniques such as shock consolidation, SHS, cold spray, and additive manufacturing. Dr. Arab has authored over 40 papers (H-index 20, >840 citations) and serves as an Editor of the Journal of Polytechnic.

Abstract:

The response of materials under extreme loading conditions—such as high strain rates, impact, and shock—is fundamental to the design of safer and more reliable structures in aerospace, defense, and energy systems. These environments involve complex deformation mechanisms, including strain-rate sensitivity, thermal softening, phase transformation, and adiabatic shear band formation. This presentation highlights recent advances in understanding how these mechanisms govern the dynamic deformation and failure behavior of titanium alloys and high-entropy alloys (HEAs).

Titanium alloys, known for their high strength-to-weight ratio and corrosion resistance, display pronounced microstructural evolution under dynamic loading, including dislocation accumulation, phase transformation, and localized shear banding. Meanwhile, HEAs—composed of multiple principal elements—offer exceptional mechanical strength, thermal stability, and damage tolerance. By employing modern processing methods such as additive manufacturing, shock consolidation, and self-propagating high-temperature synthesis (SHS), their microstructure and performance can be precisely engineered. Together, these insights enable the design of next-generation materials capable of maintaining integrity and performance under the most extreme environments.