Tuning thermal expansion by a continuing atomic rearrangement mechanism in a multifunctional titanium alloy

doi:10.1016/j.jmst.2020.11.053

CORC > 金属研究所 > 中国科学院金属研究所

	Tuning thermal expansion by a continuing atomic rearrangement mechanism in a multifunctional titanium alloy
	Gong, D. L.2,3; Wang, H. L.1; Obbard, E. G.4; Li, S. J.2; Yang, R.2; Hao, Y. L.2
刊名	JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
	2021-07-30
卷号	80 页码:234-243
关键词	Coefficient of thermal expansion Multifunctional titanium alloys Spongy microstructure Atomic rearrangement Elastic anisotropy
ISSN号	1005-0302
DOI	10.1016/j.jmst.2020.11.053
通讯作者	Hao, Y. L.(ylhao@imr.ac.cn)
英文摘要	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.
资助项目	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研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
出版者	JOURNAL MATER SCI TECHNOL
WOS记录号	WOS:000656122300021
资助机构	NSF of China ; MOST of China ; CAS
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/160742]
专题	金属研究所_中国科学院金属研究所
通讯作者	Hao, Y. L.
作者单位	1.Dongguan Univ Technol, Sch Mech Engn, Dongguan 523808, Peoples R China 2.Chinese Acad Sci, Shi Changxu Innovat Ctr Adv Mat, Inst Met Res, Shenyang 110016, Peoples R China 3.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China 4.Univ New South Wales, Dept Elect Engn & Telecommun, Sydney, NSW 2052, Australia
推荐引用方式 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.