The atomic-scale mechanism for the enhanced glass-forming-ability of a Cu-Zr based bulk metallic glass with minor element additions

Q Wang; C T Liu; Y Yang; J B Liu; Y D Dong; J Lu

doi:10.1038/srep04648

The atomic-scale mechanism for the enhanced glass-forming-ability of a Cu-Zr based bulk metallic glass with minor element additions

Sci Rep. 2014 Apr 11:4:4648. doi: 10.1038/srep04648.

Authors

Q Wang¹, C T Liu², Y Yang², J B Liu², Y D Dong³, J Lu⁴

Affiliations

¹ 1] Key laboratory for structures, Institute of materials science, Shanghai University, Shanghai, China [2] Department of Mechanical and Biomedical Engineering, City University of Hong Kong, Kowloon, Hong Kong, China.
² Department of Mechanical and Biomedical Engineering, City University of Hong Kong, Kowloon, Hong Kong, China.
³ Key laboratory for structures, Institute of materials science, Shanghai University, Shanghai, China.
⁴ 1] Department of Mechanical and Biomedical Engineering, City University of Hong Kong, Kowloon, Hong Kong, China [2] Centre for Advanced Structural Materials, Shenzhen Research Institute, City University of Hong Kong, 8 Yuexing 1st Road, Shenzhen Hi-Tech Industrial Park, Nanshan District, Shenzhen, China.

Abstract

It is known that the glass forming-ability (GFA) of bulk metallic glasses (BMGs) can be greatly enhanced via minor element additions. However, direct evidence has been lacking to reveal its structural origin despite different theories hitherto proposed. Through the high-resolution transmission-electron-microscopy (HRTEM) analysis, here we show that the content of local crystal-like orders increases significantly in a Cu-Zr-Al BMG after a 2-at% Y addition. Contrasting the previous studies, our current results indicate that the formation of crystal-like order at the atomic scale plays an important role in enhancing the GFA of the Cu-Zr-Al base BMG.

Publication types

Research Support, Non-U.S. Gov't