東北大学 · 工学
Yunping Li教授の研究室では、金属材料の加工挙動と微視的変形メカニズムの解明を柱として、特に希土類元素添加Mg合金や高張力鋼における塑性加工挙動と摩擦挙動の高精度な評価に注力しています。特に、表面から容易に滑り系を同定できる新規分析手法（ST-MLRA）の開発や、非定常摩擦係数の時間的変化を実験的に定式化する取り組みが顕著です。これにより、大延性を示すMg-Gd合金の非原子面滑りの寄与や、熱間鍛造プロセスにおける摩擦補正が可能となり、材料成形の精度と効率化が図られています。
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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