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Extreme rejuvenation and softening in a bulk metallic glass
Pan, J; Wang, YX; Guo, Q; Zhang, D; Greer, AL; Li, Y; Li, Y (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Liaoning, Peoples R China.; Greer, AL (reprint author), Univ Cambridge, Dept Mat Sci & Met, 27 Charles Babbage Rd, Cambridge CB3 0FS, England.
2018-02-08
发表期刊NATURE COMMUNICATIONS
ISSN2041-1723
卷号9页码:-
摘要Rejuvenation of metallic glasses, bringing them to higher-energy states, is of interest in improving their plasticity. The mechanisms of rejuvenation are poorly understood, and its limits remain unexplored. We use constrained loading in compression to impose substantial plastic flow on a zirconium-based bulk metallic glass. The maximum measured effects are that the hardness of the glass decreases by 36%, and its excess enthalpy (above the relaxed state) increases to 41% of the enthalpy of melting. Comparably high degrees of rejuvenation have been reported only on microscopic scales at the centre of shear bands confined to low volume fractions. This extreme rejuvenation of a bulk glass gives a state equivalent to that obtainable by quenching the liquid at similar to 10(10) K s(-1), many orders of magnitude faster than is possible for bulk specimens. The contrast with earlier results showing relaxation in similar tests under tension emphasizes the importance of hydrostatic stress.; Rejuvenation of metallic glasses, bringing them to higher-energy states, is of interest in improving their plasticity. The mechanisms of rejuvenation are poorly understood, and its limits remain unexplored. We use constrained loading in compression to impose substantial plastic flow on a zirconium-based bulk metallic glass. The maximum measured effects are that the hardness of the glass decreases by 36%, and its excess enthalpy (above the relaxed state) increases to 41% of the enthalpy of melting. Comparably high degrees of rejuvenation have been reported only on microscopic scales at the centre of shear bands confined to low volume fractions. This extreme rejuvenation of a bulk glass gives a state equivalent to that obtainable by quenching the liquid at similar to 10(10) K s(-1), many orders of magnitude faster than is possible for bulk specimens. The contrast with earlier results showing relaxation in similar tests under tension emphasizes the importance of hydrostatic stress.
部门归属[pan, j. ; wang, y. x. ; li, y.] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, liaoning, peoples r china ; [guo, q. ; zhang, d.] shanghai jiao tong univ, state key lab met matrix composites, 800 dongchuan rd, shanghai 200240, peoples r china ; [greer, a. l.] univ cambridge, dept mat sci & met, 27 charles babbage rd, cambridge cb3 0fs, england
关键词Structural Relaxation Plastic-deformation Amorphous-alloys Stored Energy Shear Bands Free-volume Hardness Diffusion Stress State
学科领域Multidisciplinary Sciences
资助者National Natural Science Foundation of China [51401220, 51471165]; European Research Council under the European Union's Horizon research and innovation programme [ERC-2015-AdG-695487: ExtendGlass]
收录类别SCI
语种英语
文献类型期刊论文
条目标识符http://ir.imr.ac.cn/handle/321006/79513
专题中国科学院金属研究所
通讯作者Li, Y (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Liaoning, Peoples R China.; Greer, AL (reprint author), Univ Cambridge, Dept Mat Sci & Met, 27 Charles Babbage Rd, Cambridge CB3 0FS, England.
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GB/T 7714
Pan, J,Wang, YX,Guo, Q,et al. Extreme rejuvenation and softening in a bulk metallic glass[J]. NATURE COMMUNICATIONS,2018,9:-.
APA Pan, J.,Wang, YX.,Guo, Q.,Zhang, D.,Greer, AL.,...&Greer, AL .(2018).Extreme rejuvenation and softening in a bulk metallic glass.NATURE COMMUNICATIONS,9,-.
MLA Pan, J,et al."Extreme rejuvenation and softening in a bulk metallic glass".NATURE COMMUNICATIONS 9(2018):-.
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