Extreme rejuvenation and softening in a bulk metallic glass

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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.
刊名	NATURE COMMUNICATIONS
	2018-02-08
卷号	9 页码:-
关键词	Structural Relaxation Plastic-deformation Amorphous-alloys Stored Energy Shear Bands Free-volume Hardness Diffusion Stress State
ISSN号	2041-1723
英文摘要	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.
学科主题	Multidisciplinary Sciences
语种	英语
资助机构	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]
公开日期	2018-06-05
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/79513]
专题	金属研究所_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.
推荐引用方式 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):-.