Elastically confined martensitic transformation at the nano-scale in a multifunctional titanium alloy
文献类型：期刊论文
| 作者 | Wang, H. L.; Hao, Y. L.; He, S. Y.; Li, T.; Cairney, J. M.; Wang, Y. D.; Wang, Y.; Obbard, E. G.; Prima, F.; Du, K. |
| 刊名 | PERGAMON-ELSEVIER SCIENCE LTD
 |
| 出版日期 | 2017-08-15 |
| 卷号 | 135页码:330-339 |
| ISSN号 | 1359-6454 |
| 关键词 | Titanium Alloy Martensitic Transformation Phase Separation Superelasticity Temperature Dependence |
| 英文摘要 | A martensitic transformation (MT) is a typical first-order diffusionless crystal structural change with strong autocatalysis like avalanche at a speed of sound propagation. This unique characteristic, however, is undetectable in some multifunctional titanium alloys. Recently, a nanoscale elastically confined MT mechanism was proposed because a nanoscale Nb modulation in a Ti-Nb based alloy was observed. Here we analyze the elastic confinement in details and its induced novel properties in a wide temperature range. The statistical analyses of atom probe tomography (APT) data confirm the existence of the nano scale Nb concentration modulation. The synchrotron X-ray diffraction (SXRD) profiles demonstrate that the nanoscale Nb modulation causes weak diffuse scattering, as evidenced by the extreme broad diffraction bands. The tensile tests find a critical temperature of similar to 150 K, where the critical stress to induce the MT and Young's modulus reach the minimum and the superelastic strain reaches the maximum (similar to 4.5%) and keeps constant as the temperature decreases further to <4.2 K. To reveal these abnormal behaviors of the MT, the Born criterion governing the elastic stability of cubic crystal is modified by introducing an elastic confinement term and a new Clausius-Clapeyron relationship is established to evaluate the elastically confined MT. The results are consistent with the experimental findings, including the solely stress-induced (no thermally induced) reversibility. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.; A martensitic transformation (MT) is a typical first-order diffusionless crystal structural change with strong autocatalysis like avalanche at a speed of sound propagation. This unique characteristic, however, is undetectable in some multifunctional titanium alloys. Recently, a nanoscale elastically confined MT mechanism was proposed because a nanoscale Nb modulation in a Ti-Nb based alloy was observed. Here we analyze the elastic confinement in details and its induced novel properties in a wide temperature range. The statistical analyses of atom probe tomography (APT) data confirm the existence of the nano scale Nb concentration modulation. The synchrotron X-ray diffraction (SXRD) profiles demonstrate that the nanoscale Nb modulation causes weak diffuse scattering, as evidenced by the extreme broad diffraction bands. The tensile tests find a critical temperature of similar to 150 K, where the critical stress to induce the MT and Young's modulus reach the minimum and the superelastic strain reaches the maximum (similar to 4.5%) and keeps constant as the temperature decreases further to <4.2 K. To reveal these abnormal behaviors of the MT, the Born criterion governing the elastic stability of cubic crystal is modified by introducing an elastic confinement term and a new Clausius-Clapeyron relationship is established to evaluate the elastically confined MT. The results are consistent with the experimental findings, including the solely stress-induced (no thermally induced) reversibility. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved. |
| 学科主题 | Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering |
| 语种 | 英语 |
| 资助机构 | MOST of China [2015AA033702, 2016YFC1102600]; NSF of China [51591190, 51271180, 51631007, 51527801]; NSF of US [DMR-1410322]; U.S. Department of Energy [DE-AC02-06CH11357] |
| 公开日期 | 2018-01-10 |
| 源URL | [http://ir.imr.ac.cn/handle/321006/79145]  |
| 专题 | 金属研究所_中国科学院金属研究所 |
| 通讯作者 | Hao, YL (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, 72 Wenhua Rd, Shenyang 110016, Liaoning, Peoples R China. |
| 推荐引用方式 GB/T 7714 | Wang, H. L.,Hao, Y. L.,He, S. Y.,et al. Elastically confined martensitic transformation at the nano-scale in a multifunctional titanium alloy[J]. PERGAMON-ELSEVIER SCIENCE LTD,2017,135:330-339. |
| APA | Wang, H. L..,Hao, Y. L..,He, S. Y..,Li, T..,Cairney, J. M..,...&Hao, YL .(2017).Elastically confined martensitic transformation at the nano-scale in a multifunctional titanium alloy.PERGAMON-ELSEVIER SCIENCE LTD,135,330-339. |
| MLA | Wang, H. L.,et al."Elastically confined martensitic transformation at the nano-scale in a multifunctional titanium alloy".PERGAMON-ELSEVIER SCIENCE LTD 135(2017):330-339. |
入库方式： OAI收割
来源：金属研究所
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