Gunti Abhilash, Jana Parijat Pallab, Lee Min-Ha, Das Jayanta
Department of Metallurgical and Materials Engineering, Indian Institute of Technology Kharagpur, West Bengal 721302, India.
KITECH North America, Korea Institute of Industrial Technology, San Jose, CA 95134, USA.
Nanomaterials (Basel). 2021 Jun 25;11(7):1670. doi: 10.3390/nano11071670.
The effect of cold rolling on the evolution of hardness () and Young's modulus () on the rolling-width (RW), normal-rolling (NR), and normal-width (NW) planes in ZrTiCuNiBe (Vitreloy 1) bulk metallic glass (BMG) was investigated systematically using nanoindentation at peak loads in the range of 50 mN-500 mN. The hardness at specimen surface varied with cold rolling percentage (%) and the variation is similar on RW and NR planes at all the different peak loads, whereas the same is insignificant for the core region of the specimen on the NW plane. Three-dimensional (3D) optical surface profilometry studies on the NR plane suggest that the shear band spacing decreases and shear band offset height increases with the increase of cold rolling extent. Meanwhile, the number of the pop-in events during loading for all the planes reduces with the increase of cold rolling extent pointing to more homogeneous deformation upon rolling. Calorimetric studies were performed to correlate the net free volume content and hardness in the differently cold rolled specimens.
利用纳米压痕技术，在50 mN - 500 mN的峰值载荷范围内，系统研究了冷轧对ZrTiCuNiBe（Vitreloy 1）块体金属玻璃（BMG）轧制宽度（RW）、常规轧制（NR）和常规宽度（NW）平面上硬度（）和杨氏模量（）演变的影响。试样表面硬度随冷轧百分比（%）而变化，在所有不同峰值载荷下，RW和NR平面上的变化相似，而对于NW平面上试样的核心区域，这种变化不显著。对NR平面进行的三维（3D）光学表面轮廓测量研究表明，随着冷轧程度的增加，剪切带间距减小，剪切带偏移高度增加。同时，所有平面在加载过程中的弹出事件数量随着冷轧程度的增加而减少，这表明轧制时变形更加均匀。进行了量热研究，以关联不同冷轧试样中的净自由体积含量和硬度。
