Ni- and Cu-free Zr-Al-Co-Ag bulk metallic glasses with superior glass-forming ability

作者：Hua Nengbin; Pang Shujie; Li Yan; Wang Jianfeng; Li Ran; Georgarakis Konstantinos; Yavari Alain Reza; Vaughan Gavin; Zhang Tao^*

来源：Journal of Materials Research, 2011, 26(4): 539-546.

DOI：10.1557/jmr.2010.65

Ni- and Cu-free Zr-Al-Co-Ag bulk metallic glasses (BMGs) with diameters up to 20 mm were synthesized by copper mold casting. The effects of Ag alloying on the superior glass-forming ability (GFA) of Zr-Al-Co-Ag alloys were studied based on the localized atomic structure and crystallization behavior. High-energy synchrotron radiation x-ray diffraction result reveals that Ag addition in Zr-Al-Co system results in a more homogeneous local atomic structure, which could be an origin for the improved GFA of the Zr-Al-Co-Ag alloy. Crystallization products of the Zr-Al-Co-Ag glassy alloy are more complex than those of the Zr-Al-Co glassy alloy. The Zr-Al-Co-Ag BMGs free from highly toxic elements Ni and Cu exhibited a combination of superior GFA, high compressive fracture strength over 2000 MPa, low Young';s modulus of 93 to 94 GPa, and good corrosion resistance in phosphate-buffered solution (PBS), inspiring their potential biomedical applications.

• 出版日期2011-2
• 单位北京航空航天大学