Kumar Misra Dinesh, Woo Sohn Sung, Tae Kim Won, Hyang Kim Do
Centre for Non-crystalline Materials, Department of Metallurgical Engineering, Yonsei University, 134 Schinchon-dong, Seodaemun-ku, Seoul 120-749, South Korea.
Department of Physics, Cheongju University, Cheongju 360-764, South Korea.
Sci Technol Adv Mater. 2008 Nov 24;9(4):045004. doi: 10.1088/1468-6996/9/4/045004. eCollection 2008 Dec.
The plastic deformation of TiZrBeCuNi bulk metallic glass has been investigated by nanoindentation performed with loads ranging from 10 to 200 mN in a wide range of loading rates. The plastic flow in the alloy exhibited conspicuous serrations at low loading rates. The serrations, however, became less prominent as the rate of indentation increased. Atomic force microscopy showed a significant pile-up of materials around the indents, indicating that a highly localized plastic deformation occurred under nanoindentation. The possible mechanism governing the plastic deformation in bulk metallic glass specimens is tentatively discussed in terms of strain-induced free volume.
通过在广泛的加载速率下，对载荷范围从10到200毫牛的块状金属玻璃TiZrBeCuNi进行纳米压痕试验，研究了其塑性变形。在低加载速率下，该合金中的塑性流动呈现出明显的锯齿状。然而，随着压痕速率的增加，锯齿状变得不那么明显。原子力显微镜显示，压痕周围有大量材料堆积，表明在纳米压痕下发生了高度局部化的塑性变形。本文根据应变诱导自由体积，初步讨论了块状金属玻璃试样塑性变形的可能机制。
