WPI Advanced Institute for Materials Research, Tohoku University, Japan 2-1-1, Katahira, Aoba-ku, Sendai, Miyagi, 980-8577, Japan.
Sci Rep. 2013 Oct 8;3:2798. doi: 10.1038/srep02798.
Metallic glasses due to their unique combination of physical and chemical properties have a great potential in various applications: materials for construction, medical, MEMs devices and so on. The deformation mechanism in metallic glasses is very much different from that in conventional crystalline materials and not yet fully understood. Here we are trying to find out what drives shear deformation in metallic glasses. The compression experiments of the bulk metallic glassy (BMG) samples coated with tin, Rose metal and indium were performed. There were no melting sites of the coating observed near individual shear bands. Melting occurred only near fracture surface, near microcracks and in the places of shear band concentrations. The results indicate that shear banding is rather a stress driven process while the temperature rise that was observed takes place due to friction forces in the viscous supercooled liquid thin layer in the shear bands.
金属玻璃由于其独特的物理和化学性质组合，在各种应用中具有巨大的潜力：建筑材料、医疗、MEMs 器件等。金属玻璃的变形机制与传统的结晶材料有很大的不同，目前还不完全清楚。在这里，我们试图找出是什么驱动了金属玻璃的剪切变形。对涂有锡、玫瑰金和铟的块状金属玻璃（BMG）样品进行了压缩实验。在个别剪切带附近没有观察到涂层的熔化点。只有在靠近断裂面、微裂纹和剪切带集中处才发生熔化。结果表明，剪切带形成是一个受应力驱动的过程，而观察到的温度升高是由于剪切带中粘性过冷液体薄层中的摩擦力引起的。
