Anomalous thermal expansion in the deep super-cooled liquid region of a ZrCuAlAg bulk metallic glass. Issue 2 (1st February 2018)

• Record Type: Journal Article
• Authors: Hu, Q.; Wang, J. M.; Yan, Y. H.; Luo, F. F.; Guo, S.; Liu, J.; Chen, S. S.; Huang, B.; Lu, D. P.; Zou, J. Z.; Zeng, X. R.
• Is Part Of: Materials research letters. Volume 6:Issue 2(2018)
• Page Start: 121
• Page End: 129
• Publication Date: 2018-02-01
• Subjects: Bulk metallic glasses -- super-cooled liquid -- viscous flow -- nano-crystals -- grain boundary; Materials science -- Research -- Periodicals; Biomedical materials -- Research -- Periodicals; Composite materials -- Research -- Periodicals; Biomedical materials -- Research; Composite materials -- Research; Materials science -- Research; Periodicals; 620.1105
• DOI: 10.1080/21663831.2017.1408713
• Languages: English
• ISSNs: 2166-3831

Abstract

ABSTRACT: Bulk metallic glasses (BMGs), like other glasses, soften in the super-cooled liquid region (SCLR). Here in this work, surprisingly, a large expansion is reported occurring in the deep SCLR of a Zr47 Cu37 Al8 Ag8 BMG. Nano-crystals (NCs) are found precipitated during the anomalous expansion of Zr47 Cu37 Al8 Ag8, but also in the SCLR of Zr43 Cu41 Al8 Ag8 that exhibits a conventional softening. It is found that there is a steep composition and density change at the NCs/amorphous matrix transition region in the former alloy, and this transition region exerts a thermal stress of about 0.15 MPa to the surrounding super-cooled liquid (SCL) and drives the soft SCL to expand severely. GRAPHICAL ABSTRACT: