Unusually thick shear-softening surface of micrometer-size metallic glasses
文献类型：期刊论文
| 作者 | BSRF用户 |
| 刊名 | Innovation (New York, NY)
 |
| 出版日期 | 2021 |
| 卷号 | 2期号:2页码:100106 |
| ISSN号 | 2666-6758 |
| DOI | 10.1016/j.xinn.2021.100106 |
| 文献子类 | Article |
| 英文摘要 | The surface of glass is crucial for understanding many fundamental processes in glassy solids. A common notion is that a glass surface is a thin layer with liquid-like atomic dynamics and a thickness of a few tens of nanometers. Here, we measured the shear modulus at the surface of both millimeter-size and micrometer-size metallic glasses (MGs) through high-sensitivity torsion techniques. We found a pronounced shear-modulus softening at the surface of MGs. Compared with the bulk, the maximum decrease in the surface shear modulus (G) for the micro-scale MGs reaches 27%, which is close to the decrease in the G upon glass transition, yet it still behaves solid-like. Strikingly, the surface thickness estimated from the shear-modulus softening is at least 400 nm, which is approximately one order of magnitude larger than that revealed from the glass dynamics. The unusually thick surface is also confirmed by measurements using X-ray nano-computed tomography, and this may account for the brittle-to-ductile transition of the MGs with size reductions. The unique and unusual properties at the surface of the micrometer-size MGs are physically related to the negative pressure effect during the thermoplastic formation process, which can dramatically reduce the density of the proximate surface region in the supercooled liquid state. [Display omitted] •The shear modulus and thickness of metallic glass (MG) surface is determined through torsion testing on micrometer-size wires•The surface region of MG wires has a significant shear-modulus softening close to the supercooled liquid, yet still behaves solid-like•The thickness of the soft surface of MG wires is at least 400 nm, which is about one order of magnitude larger than those revealed from surface dynamics•The unusually thick surface accounts for the brittle-to-ductile transition of the MGs with size reduction |
| 源URL | [http://ir.ihep.ac.cn/handle/311005/292832]  |
| 专题 | 北京同步辐射装置 |
| 推荐引用方式 GB/T 7714 | BSRF用户. Unusually thick shear-softening surface of micrometer-size metallic glasses[J]. Innovation (New York, NY),2021,2(2):100106. |
| APA | BSRF用户.(2021).Unusually thick shear-softening surface of micrometer-size metallic glasses.Innovation (New York, NY),2(2),100106. |
| MLA | BSRF用户."Unusually thick shear-softening surface of micrometer-size metallic glasses".Innovation (New York, NY) 2.2(2021):100106. |
入库方式： OAI收割
来源：高能物理研究所
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