Strain-hardening and suppression of shear-banding in rejuvenated bulk metallic glass

doi:10.1038/s41586-020-2016-3

IMR OpenIR

	Strain-hardening and suppression of shear-banding in rejuvenated bulk metallic glass
	Pan, J.1; Ivanov, Yu. P.2,3; Zhou, W. H.1,4; Li, Y.1; Greer, A. L.2
通讯作者	Li, Y.(liyi@imr.ac.cn) ; Greer, A. L.(alg13@cam.ac.uk)
	2020-02-01
发表期刊	NATURE
ISSN	0028-0836
卷号	578 期号:7796 页码:559-+
摘要	Strain-hardening (the increase of flow stress with plastic strain) is the most important phenomenon in the mechanical behaviour of engineering alloys because it ensures that flow is delocalized, enhances tensile ductility and inhibits catastrophic mechanical failure(1,2). Metallic glasses (MGs) lack the crystallinity of conventional engineering alloys, and some of their properties-such as higher yield stress and elastic strain limit(3)-are greatly improved relative to their crystalline counterparts. MGs can have high fracture toughness and have the highest known 'damage tolerance' (defined as the product of yield stress and fracture toughness)(4) among all structural materials. However, the use of MGs in structural applications is largely limited by the fact that they show strain-softening instead of strain-hardening; this leads to extreme localization of plastic flow in shear bands, and is associated with early catastrophic failure in tension. Although rejuvenation of an MG (raising its energy to values that are typical of glass formation at a higher cooling rate) lowers its yield stress, which might enable strain-hardening(5), it is unclear whether sufficient rejuvenation can be achieved in bulk samples while retaining their glassy structure. Here we show that plastic deformation under triaxial compression at room temperature can rejuvenate bulk MG samples sufficiently to enable strain-hardening through a mechanism that has not been previously observed in the metallic state. This transformed behaviour suppresses shear-banding in bulk samples in normal uniaxial (tensile or compressive) tests, prevents catastrophic failure and leads to higher ultimate flow stress. The rejuvenated MGs are stable at room temperature and show exceptionally efficient strain-hardening, greatly increasing their potential use in structural applications. Bulk metallic glasses can acquire the ability to strain-harden through a mechanical rejuvenation treatment at room temperature that retains their non-crystalline structure.
资助者	National Natural Science Foundation of China ; Shenyang National Laboratory for Materials Science ; European Research Council under the European Union
DOI	10.1038/s41586-020-2016-3
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[51871217] ; Shenyang National Laboratory for Materials Science ; European Research Council under the European Union[ERC-2015-AdG-695487]
WOS研究方向	Science & Technology - Other Topics
WOS类目	Multidisciplinary Sciences
WOS记录号	WOS:000516571100016
出版者	NATURE PUBLISHING GROUP
引用统计	被引频次：495[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/137424
专题	中国科学院金属研究所
通讯作者	Li, Y.; Greer, A. L.
作者单位	1.Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Shenyang, Peoples R China 2.Univ Cambridge, Dept Mat Sci & Met, Cambridge, England 3.Far Eastern Fed Univ, Sch Nat Sci, Vladivostok, Russia 4.Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei, Peoples R China
推荐引用方式 GB/T 7714	Pan, J.,Ivanov, Yu. P.,Zhou, W. H.,et al. Strain-hardening and suppression of shear-banding in rejuvenated bulk metallic glass[J]. NATURE,2020,578(7796):559-+.
APA	Pan, J.,Ivanov, Yu. P.,Zhou, W. H.,Li, Y.,&Greer, A. L..(2020).Strain-hardening and suppression of shear-banding in rejuvenated bulk metallic glass.NATURE,578(7796),559-+.
MLA	Pan, J.,et al."Strain-hardening and suppression of shear-banding in rejuvenated bulk metallic glass".NATURE 578.7796(2020):559-+.