Suppression of crystallization in a Ca-based bulk metallic glass by compression

JOURNAL OF ALLOYS AND COMPOUNDS

卷:765

Article

Naeem, M.¹  Lan, S.^1,2  Wang, B.¹  Wei, X. Y.¹  Zhou, J.³  Ren, Y.⁴  Lu, Z. P.³  Ma, D.⁵  Stoica, A. D.⁵  Wang, X-L^1,6 

[1] City Univ Hong Kong, Dept Phys, 83 Tat Chee Ave, Kowloon, Hong Kong, Peoples R China

[2] Nanjing Univ Sci & Technol, Herbert Gleiter Inst Nanosci, Nanjing 210094, Jiangsu, Peoples R China

[3] Univ Sci & Technol Beijing, State Key Lab Adv Met & Mat, Beijing 100083, Peoples R China

[4] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA

[5] Oak Ridge Natl Lab, Neutron Scattering Div, Spallat Neutron Source, POB 2009, Oak Ridge, TN 37831 USA

[6] City Univ Hong Kong, Ctr Neutron Scattering, Shenzhen Res Inst, Shenzhen Hitech Ind Pk, Shenzhen 518057, Peoples R China

关键词: Bulk metallic glass;    Crystallization;    Annealing;    Compression test;    In-situ x-ray diffraction;   

DOI  :  10.1016/j.jallcom.2018.06.200

来源: Elsevier

【 摘 要 】

We have studied the crystallization kinetics of Ca40Mg25Cu35 bulk metallic glass under isothermal annealing in the supercooled liquid region, with and without applied stress, by in situ high-energy synchrotron x-ray diffraction. We observed that without stress, crystallization started from the very beginning of isothermal annealing. However, when a uniaxial compressive stress was applied during isothermal annealing, no change in atomic order was observed at the beginning. Thereafter, the glassy structure relaxed, but still without noticeable evidence of crystallization. It is suggested that the applied compressive stress restricted the atomic mobility, which suppressed crystallization. (C) 2018 Elsevier B.V. All rights reserved.

【 授权许可】

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