Tohoku University · Engineering
Professor Yunping Li's research lab specializes in the fundamental mechanics and microstructural evolution of metallic materials, with a focus on deformation behavior, slip systems, and friction dynamics in high-temperature forming processes. The lab develops advanced characterization techniques—such as modified lattice rotation analysis and Slip Trace–Modified Lattice Rotation Analysis (ST-MLRA)—to identify active slip systems and twin modes in polycrystalline alloys, particularly magnesium and steel alloys. Their work bridges experimental mechanics with computational modeling to understand texture evolution, workability, and formability under extreme conditions.
Figures are computed from collected data and may differ slightly.
This article provides a model that regards the evolution behavior of the friction coefficient in the cylindrical compression test as a function of true strain on the basis of experimental results, allowing the effect of friction on the deformation curve at extremely high strain level to be evaluated and corrected for the first time. The compressive tests were carried out at a stroke rate of 1.2 mm/s on IHS38MSV hypoeutectoid steel with various lubricants at temperatures ranging from 800 °C to 12
The inconsistencies regarding the fundamental correlation between Gd content and slip (twinning) activities of Mg alloys appeal further investigations. However, the traditional slip dislocations analysis by TEM is time-consuming, and that by SEM/EBSD cannot recognize the partial slip modes. These urge a more efficient and comprehensive approach to easily distinguish all potential slip modes occurred concurrently in alloy matrix. Here we report a modified lattice rotation analysis that can distin
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