| DOI | 10.1038/s41586-020-2016-3
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| Strain-hardening and suppression of shear-banding in rejuvenated bulk metallic glass |
| Papai, Gabor1,2,3,4; Frechard, Alexandre1,2,3,4; Kolesnikova, Olga1,2,3,4; Crucifix, Corinne1,2,3,4; Schultz, Patrick1,2,3,4; Ben-Shem, Adam1,2,3,4
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| 2020-01-22
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| 发表期刊 | NATURE
 |
| ISSN | 0028-0836
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| EISSN | 1476-4687
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| 出版年 | 2020
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| 卷号 | 578期号:7796页码:559-+ |
| 文章类型 | Article
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| 语种 | 英语
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| 国家 | Peoples R China; England; Russia |
| 英文关键词 | 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.
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| 领域 | 地球科学
; 气候变化
; 资源环境
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| 收录类别 | SCI-E
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| WOS记录号 | WOS:000516571100016
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| WOS关键词 | TENSILE DUCTILITY
; FRACTURE
; MECHANISMS
; TRANSITION
; NECKING
; STATE
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| WOS类目 | Multidisciplinary Sciences
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| WOS研究方向 | Science & Technology - Other Topics
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| 引用统计 |
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| 文献类型 | 期刊论文
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| 条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/281500
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| 专题 | 地球科学
资源环境科学
气候变化
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| 作者单位 | 1.Inst Genet & Biol Mol & Cellulaire, Integrated Struct Biol Dept, Equipe Labellisee Ligue Canc, Illkirch Graffenstaden, France;
2.CNRS, UMR7104, Illkirch Graffenstaden, France;
3.INSERM, U1258, Illkirch Graffenstaden, France;
4.Univ Strasbourg, Illkirch Graffenstaden, France
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推荐引用方式
GB/T 7714 |
Papai, Gabor,Frechard, Alexandre,Kolesnikova, Olga,et al. Strain-hardening and suppression of shear-banding in rejuvenated bulk metallic glass[J].
NATURE,2020,578(7796):559-+.
|
| APA |
Papai, Gabor,Frechard, Alexandre,Kolesnikova, Olga,Crucifix, Corinne,Schultz, Patrick,&Ben-Shem, Adam.(2020).Strain-hardening and suppression of shear-banding in rejuvenated bulk metallic glass.NATURE,578(7796),559-+.
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| MLA |
Papai, Gabor,et al."Strain-hardening and suppression of shear-banding in rejuvenated bulk metallic glass".NATURE 578.7796(2020):559-+.
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