| Tuning thermal expansion by a continuing atomic rearrangement mechanism in a multifunctional titanium alloy | |
| Gong, D. L.1,2; Wang, H. L.3; Obbard, E. G.4; Li, S. J.1; Yang, R.1; Hao, Y. L.1 | |
| Corresponding Author | Hao, Y. L.(ylhao@imr.ac.cn) |
| 2021-07-30 | |
| Source Publication | JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
 |
| ISSN | 1005-0302 |
| Volume | 80Pages:234-243 |
| Abstract | As to multifunctional titanium alloys with high strength and low elastic modulus, thermal training is crucial to tune their thermal expansion from positive to negative, resulting in a novel linear expansion which is stable in a wide temperature range. Aided by the high-order Hooke's law of elastic solids, a reversible atomic rearrangement mechanism was proposed to explain the novel findings which are unexpected from typical shape memory alloys. To confirm this continuous mechanism, a Ti-Nb based alloy, which possesses a nanoscale spongy microstructure consisting of the interpenetrated Nb-rich and Nb-lean domains produced by spinodal decomposition, was used to trace the crystal structure change by in-situ high energy synchrotron X-ray diffraction analyses. By increasing exposure time, the overlapped diffraction peaks can be separated accurately. The calculated results demonstrate that, in the nanoscale Nb-lean domains, the crystal structure parameters vary linearly with changing temperature along the atomic pathway of the bcc-hcp transition. This linear relationship in a wide temperature range is unusual for first-order martensitic shape memory alloys but is common for Invar alloys with high-order spin transitions. Furthermore, the alloy exhibits smooth DSC curves free of transformation-induced heat peaks observed in shape memory alloys, which is consistent with the proposed mechanism that the reversible transition is of high-order. (C) 2021 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology. |
| Keyword | Coefficient of thermal expansion Multifunctional titanium alloys Spongy microstructure Atomic rearrangement Elastic anisotropy |
| Funding Organization | NSF of China ; MOST of China ; CAS |
| DOI | 10.1016/j.jmst.2020.11.053 |
| Indexed By | SCI |
| Language | 英语 |
| Funding Project | NSF of China[51771209] ; NSF of China[51631007] ; NSF of China[51571190] ; MOST of China[2016YFC1102600] ; MOST of China[2017YFC1104901] ; CAS[QYZDJ-SSW-JSC031] |
| WOS Research Area | Materials Science ; Metallurgy & Metallurgical Engineering |
| WOS Subject | Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering |
| WOS ID | WOS:000656122300021 |
| Publisher | JOURNAL MATER SCI TECHNOL |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/160743 |
| Collection | 中国科学院金属研究所 |
| Corresponding Author | Hao, Y. L. |
| Affiliation | 1.Chinese Acad Sci, Shi Changxu Innovat Ctr Adv Mat, Inst Met Res, Shenyang 110016, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China 3.Dongguan Univ Technol, Sch Mech Engn, Dongguan 523808, Peoples R China 4.Univ New South Wales, Dept Elect Engn & Telecommun, Sydney, NSW 2052, Australia |
| Recommended Citation GB/T 7714 | Gong, D. L.,Wang, H. L.,Obbard, E. G.,et al. Tuning thermal expansion by a continuing atomic rearrangement mechanism in a multifunctional titanium alloy[J]. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,2021,80:234-243. |
| APA | Gong, D. L.,Wang, H. L.,Obbard, E. G.,Li, S. J.,Yang, R.,&Hao, Y. L..(2021).Tuning thermal expansion by a continuing atomic rearrangement mechanism in a multifunctional titanium alloy.JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,80,234-243. |
| MLA | Gong, D. L.,et al."Tuning thermal expansion by a continuing atomic rearrangement mechanism in a multifunctional titanium alloy".JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 80(2021):234-243. |
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