Comparative studies of constitutive properties of nanocrystalline and bulk iron during compressive deformation
文献类型：期刊论文
| 作者 | Yu, XH ; Zhang, JZ ; Wang, LP ; Ding, ZJ ; Jin, CQ ; Zhao, YS |
| 刊名 | ACTA MATERIALIA
 |
| 出版日期 | 2011 |
| 卷号 | 59期号:9页码:3384 |
| 关键词 | PLASTIC-DEFORMATION SEMICONDUCTOR NANOCRYSTALS DISLOCATION NUCLEATION MAXIMUM STRENGTH GRAIN-SIZE COPPER DIFFRACTION DISSIPATION ENERGY NICKEL |
| ISSN号 | 1359-6454 |
| 通讯作者 | Yu, XH: Los Alamos Natl Lab, LANSCE Div, POB 1663, Los Alamos, NM 87545 USA. |
| 中文摘要 | We present a comparative study of the mechanical properties of body-centered cubic nanocrystalline iron (nano-Fe) and microcrystalline iron (micro-Fe) by in situ high-pressure synchrotron X-ray diffraction under triaxial compression. For nano-Fe with a starting high dislocation density of 10(16) m(-2), the peak broadening is almost reversible upon unloading from 8.6 GPa to atmospheric pressure, indicating that no additional dislocations are built up during compressive deformation inside grains, at grain boundaries or twin boundaries. Furthermore, an orientation-dependent surface strain is found to be stored in the surface layer of the bcc nano-Fe, which is in agreement with the core-shell model of the nanocrystals. For micro-Fe, a significant and continuous peak sharpening and the associated work softening were observed after the sample is yielded at pressures above 2.0 GPa, which can be presumably attributed to a pressure-induced dislocation annihilation. This finding/interpretation supports the hypothesis that the annihilation of dislocations is one of the dominant mechanisms underlying the plastic energy dissipation. The determined yield strength of 2.0 GPa for nano-Fe is more than 15 times higher than that for micro-Fe (0.13 GPa), indicating that the nanoscale grain-size reduction is a substantially more effective strengthening mechanism than conventional carbon infusion in iron. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved. |
| 收录类别 | SCI |
| 资助信息 | Los Alamos National Laboratory; DOE [DE-AC52-06NA25396]; NSF [EAR 01-35554] |
| 语种 | 英语 |
| 公开日期 | 2013-09-17 |
| 源URL | [http://ir.iphy.ac.cn/handle/311004/34938]  |
| 专题 | 物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文 |
| 推荐引用方式 GB/T 7714 | Yu, XH,Zhang, JZ,Wang, LP,et al. Comparative studies of constitutive properties of nanocrystalline and bulk iron during compressive deformation[J]. ACTA MATERIALIA,2011,59(9):3384. |
| APA | Yu, XH,Zhang, JZ,Wang, LP,Ding, ZJ,Jin, CQ,&Zhao, YS.(2011).Comparative studies of constitutive properties of nanocrystalline and bulk iron during compressive deformation.ACTA MATERIALIA,59(9),3384. |
| MLA | Yu, XH,et al."Comparative studies of constitutive properties of nanocrystalline and bulk iron during compressive deformation".ACTA MATERIALIA 59.9(2011):3384. |
入库方式： OAI收割
来源：物理研究所
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