Ordering-induced Elinvar effect over a wide temperature range in a spinodal decomposition titanium alloy
作者机构：Shi-changxu Innovation Center for Advanced MaterialsInstitute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and EngineeringUniversity of Science and Technology of ChinaShenyang 110016China School of Mechanical EngineeringDongguan University of TechnologyDongguan 523808China Shenyang National Laboratory for Materials ScienceInstitute of Metal ResearchChinese Academy of SciencesShenyang 110016China Analysis and Testing CenterInstitute of Metal ResearchChinese Academy of SciencesShenyang 110016China Beijing Advanced Innovation Center for Materials Genome EngineeringInstitute of Solid State ChemistryDepartment of Physical ChemistryUniversity of Science and Technology BeijingBeijing 100083China State Key Laboratory for Advanced Metals and MaterialsUniversity of Science and Technology BeijingBeijing 100083China
出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)
年 卷 期：2023年第150卷第19期
页 面：245-255页
核心收录：
学科分类：0806[工学-冶金工程] 08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学]
基 金：supported by the National Natural Science Foundation of China (Nos.51771209 and 51901042) the Foun-dation 91960202 and CAS (No.QYZDJ-SSW-JSC031)
主 题：Titanium alloy Spinodal decomposition Crystal ordering Elinvar effect Mechanical properties
摘 要：Temperature-independent elastic modulus is termed as Elinvar effect,which is available by tuning the continuous spin transition of ferromagnetic alloys via composition optimization and the first-order martensitic transformation of shape memory alloys via plastic ***,these reversible mechanisms are restricted generally in a narrow temperature range of less than 300 *** reports,by tuning a spinodal decomposition in a Ti-Nb-based titanium alloy via aging treatment,both the Elinvar effect in a wide temperature range of about 500 K and a high strength-to-modulus ratio of about 1.5%can be obtained by a continuous and reversible crystal ordering *** results demonstrate that the alloy aged at 723 K for 4 h has a nanoscale plate-like modulatedβ+αtwo-phase microstructure and its elastic modulus keeps almost constant from 100 to 600 *** and in-situ X-ray diffraction measurements reveal that the crystal ordering parameter of theαphase increases linearly with temper-ature from 0.88 at 133 K to 0.97 at 523 K but its volume fraction keeps a constant of about 33.8%.This suggests that the continuous ordering of theαphase toward the high modulusαphase induces a posi-tive modulus-temperature relation to balance the negative relation of the elastically stableβ*** aged alloy exhibits a high yield strength of 1200 MPa,good ductility of 16%and a high elastic admissible strain of 1.5%.Our results provide a novel strategy to extend the Elinvar temperature range and enhance the strength by tuning the crystal ordering of decomposition alloys.
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