WPI Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan.
Nanotechnology. 2013 Feb 1;24(4):045610. doi: 10.1088/0957-4484/24/4/045610. Epub 2013 Jan 8.
A new class of materials: Au-based nanograined metallic glasses (NGMGs) were synthesized using magnetron sputtering with powder targets. A detailed study by x-ray diffraction and high-resolution transmission electron microscopy (TEM) documents the unique nanoscale granular structure of the Au-based NGMG. This material inherited the good mechanical properties of metallic glasses, showing a high hardness of ∼5.3 GPa and a low elastic modulus of ∼79 GPa. In addition, in contrast to most MGs the nanoglassy particles can deform along the loading direction, exhibiting unique tensile elongation up to 100%. During thermal crystallization of NGMG material, even smaller sized Au solid solution nanocrystals are formed within the glassy nanograins, offering a new way for production of the nanocomposites with tailored structural length scales.
采用磁控溅射粉末靶的方法合成了基于金的纳米晶非晶态合金（NGMGs）。X 射线衍射和高分辨率透射电子显微镜（TEM）的详细研究记录了基于金的 NGMG 的独特纳米级颗粒结构。这种材料继承了非晶态合金的良好力学性能，表现出约 5.3GPa 的高硬度和约 79GPa 的低弹性模量。此外，与大多数非晶态合金不同的是，纳米玻璃状颗粒可以沿加载方向变形，表现出独特的拉伸伸长率高达 100%。在 NGMG 材料的热结晶过程中，即使在玻璃纳米颗粒内也形成了更小尺寸的 Au 固溶纳米晶体，为生产具有定制结构长度尺度的纳米复合材料提供了一种新方法。
