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Acta Metall Sin  2025, Vol. 61 Issue (6): 809-825    DOI: 10.11900/0412.1961.2024.00264
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Research Progress on Zero Thermal Expansion Metallic Materials
SONG Yuzhu1(), ZHANG Jimin1, ZHOU Chang2, SHI Naike1, CHEN Jun1()
1 Department of Physical Chemistry, University of Science and Technology Beijing, Beijing 100083, China
2 State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China
Cite this article: 

SONG Yuzhu, ZHANG Jimin, ZHOU Chang, SHI Naike, CHEN Jun. Research Progress on Zero Thermal Expansion Metallic Materials. Acta Metall Sin, 2025, 61(6): 809-825.

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Abstract  

With the advancement of technology, the exploration of space, oceans, and underground resources continues to deepen. An ever-increasing demand for devices that operate under extreme conditions propels the need for the precise control of the thermal expansion properties of the materials used. Zero thermal expansion metals exhibit constant dimensions despite temperature variations, a unique feature that imparts these metals a significant application value in high-precision and high-stability devices. This article summarizes the research progress on zero thermal expansion metals since the discovery of Invar alloy over a century ago. It provides an overview of the definition, classification, and historical development of zero thermal expansion metals. Furthermore, this article introduces several main mechanisms inducing zero thermal expansion in metals and highlights several categories of metals with excellent zero thermal expansion properties and high application value. Moreover, it discusses the crystal structures, zero thermal expansion properties, and methods for controlling the thermal expansion properties of different types of metals. The coupling relationship between the magnetism, phase transitions, and thermal expansion properties is explored. Finally, the article provides a perspective on future trends in the development of zero thermal expansion metals.

Key words:  zero thermal expansion      low thermal expansion alloy      functional metallic material      thermal expansion control     
Received:  31 July 2024     
ZTFLH:  O482.2  
Fund: National Key Research and Development Program of China(2022YFE0109100);National Natural Science Foundation of China(22275014);National Natural Science Foundation of China(12104038);Beijing Outstanding Young Scientist Program(JWZQ20240101015)
Corresponding Authors:  SONG Yuzhu, associate professor, Tel: (010)62332265, E-mail: yuzhusong@ustb.edu.cn;
CHEN Jun, professor, Tel: (010)62332265, E-mail: junchen@ustb.edu.cn

URL: 

https://www.ams.org.cn/EN/10.11900/0412.1961.2024.00264     OR     https://www.ams.org.cn/EN/Y2025/V61/I6/809

Fig.1  Zero thermal expansion (ZTE) of metallic materials, originates from the mutual cancellation between the positive contribution to volume (ΔV2) from lattice vibrations and the negative contributions to volume (ΔV1) from magnetovolume efect, martensitic phase transitions, or valence state changes (TC—Curie temperature)
Fig.2  Volume (showed by numbers) decreases of the Invar alloy as the ferromagnetic ordered magnetic structure transitions to a disordered paramagnetic structure[9]
MaterialTypeαl / (10-6 K-1)Temp. range / KRef.
Fe0.65Ni0.35Invar1.5193-373[17]
Zr0.8Nb0.2Fe2AFe21.43-470[18]
(Zr0.65Nb0.35)0.95Fe0.05Fe20.474-425[19]
Zr0.8Ta0.2Fe1.7Co0.30.21100-360[20]
Zr0.7Ta0.3Fe20.910-430[21]
Sc0.55Ti0.45Fe20.41a10-250[22]
Sc0.725Nb0.275Fe20.69108-264[23]
HfFe2.50.42a433-583[24]
Hf0.8Nb0.2Fe2.50.06a250-380[25]
Hf0.6Ti0.4Fe2.50.53a100-450[26]
Hf0.85Ta0.15Fe2C0.010.8a85-245[27]
Tb(Co1.9Fe0.1)RCo20.48123-307[28]
Gd0.25Dy0.75Co1.93Fe0.070.1610-275[29]
Gd0.5(Ho0.5Dy0.5)0.5Co21.35-220[30]
LaFe11.0Si2.0 hydrideLa(Fe, M)130.520-275[31]
LaFe10.3Al2.70.364.2-250[32]
LaFe10.6Si2.4-0.815-150[33]
Ho2Fe16CoR2Fe170.07a3-461[34]
Ho2Fe16Cr0.43a13-330[35]
Er2(Fe0.95Co0.05)14BR2Fe14B0.5a120-475[36]
MnCoGe0.99In0.01MnCoGe0.68200-310[37]
ErFe10V1.4Mo0.6RFe121.6120-440[38]
MnFe4Si3Mn5Si30.45b10-310[39]
Ni49.4Ti50.6Ti-based0.53b123-353[40]
Ni50.8Ti49.22.3b77-300[41]
Ti22Nb0.2b273-573[42]
xLFCS/39.7%Cu (volume fraction)Duplex alloy-0.21200-320[43]
LaFe54Co3.5Si3.351.10260-310[14]
Ho0.04Fe0.960.19b100-335[15]
LaFe10.1Cu0.5Si2.40.28185-250[44]
Er2Fe19B1.350.28100-500[16]
Fe2.75Co0.25PtB0.250.95360-560[45]
Hf0.8Ta0.2Fe2.50.352265-350[46]
Table 1  Thermal expansion data of zero thermal expansion metallic materials[14-46]
Fig.3  Comparison of zero expansion temperature zone of different materials (Dashed line represents room temperature)
Fig.4  Calculated spin configurations at Fe (orange) and Ni (blue) atoms in fully ordered ferromagnetic states (0 K), ambient states, and paramagnetic states (The size of the arrow is proportional to the calculated magnetic moment)[48] (a), the relationship between the magnetization of Invar alloy and the pressure (P)[48] (b), comparison of linear expansion of Invar alloy, Fe, Cu and Al (Δl / l0—relative length variation) (c), change of phonon entropy and magnetic entropy of Invar alloy with pressure (Sph—phonon entropy; ΔSmag—magnetic entropy change)[48] (d), and change of the sum of phonon entropy and magnetic entropy (ΔSph—phonon entropy change)[48] (e)
Fig.5  Zero thermal expansion properties of AFe2 (A = Zr, Nb, Hf, Ta, Sc, and Ti) systems[18,19,21,22,24,26]
(a) comparison of macroscopic linear expansion of Zr0.8Nb0.2Fe2, Fe0.64Ni0.36, and Fe[18]
(b) temperature dependence of cell parameters for neutron diffraction and synchrotron radiation analysis of (Zr0.65Nb0.35)0.95Fe0.05Fe2 (ZNFF)[19] (SXRD—synchrotron X-ray diffraction, NPD—neutron powder diffraction, a—cell parameter, αa —thermal expansion coefficient of crystal in a-axis direction)
(c) variation of cell parameters of Zr0.7Ta0.3Fe2 with temperature (Δa—change of a,ZTE—zero thermal expansion, FM—ferromagnetic, AFM—antiferromagnetic)[21]
(d) relative cell volume of (Sc, Ti)Fe2 varies with temperature when x = 0 (PTE—positive thermal expansion), x = 0.45 (ZTE), and x = 0.6 (NTE—negative thermal expansion)[22]V / V—relative cell volume variation; CMVE—traditional magnetic volume effect; UMVE—unconventional magnetic volume effect)
(e) temperature dependence of unit cell volumes for HfFe2 + δ (δ = 0.3, 0.5, and 0.6)[24] (LTE—low thermal expansion)
(f) dilatometer thermal expansion of TiFe2 and Hf0.6Ti0.4Fe2 + x (x = 0, 0.5, and 1.3)[26]
Fig.6  Magnetic structure, crystal structure, and thermal expansion regulation of RCo2 (R = Tb, Gd, and Dy) systems[28,29]
(a) crystal and magnetic structures of Tb(Co1.9Fe0.1) intermetallic compound at 10 K[28]
(b) Tb(Co1 - x Fe x)2 macroscopic linear expansion curves[28]
(c) comparison of intrinsic volume expansion and macroscopic linear expansion[28]
(d) crystal structure of Gd0.25Dy0.75Co1.93Fe0.07 (GDCF)[29]
(e) linear thermal expansion of Gd x Dy1 - x Co2 and GDCF (Inset shows Δl / l0 of GdCo2 (x = 1) in the high temperature region)[29]
Fig.7  Thermal expansion properties and macroscopic magnetic properties of La(Fe, M)13 (M = Si, Al) type metal materials[31,32]
(a, b) thermal expansions of LaFe13 - x Si x (x = 1.5, 2.0, 2.4) (a) and LaFe13 - x Si x hydrides (x = 1.5, 2.0, 2.4) (b)[31]a / a300 K—rate of change of cell parameter relative to 300 K, ΔT—temperature difference)
(c, d) macroscopic magnetisms of LaFe13 - x Si x (c) and LaFe13 - x Si x hydrides (d)[31] (Inset in Fig.7d shows the TC curves for original and hydrogenated LaFe13 - x Si x sample)
(e) thermal expansion of LaFe13 - x Al x (x = 2.5, 2.7)[32] (SS304—304 stainless steel, ΔL / L(300 K)—linear thermal expansion reative to 300 K)
(f) macroscopic magnetism of LaFe13 - x Al x (x = 1.8, 1.9, 2.1, 2.3, 2.5, 2.7)[32] (PM—paramagnetic)
Fig.8  Thermal expansion properties of Ho2(Fe, Co)17 and its regulation mechanism[34]
(a) volumetric thermal expansion of Ho2(Fe, Co)17V—relative volume variation, SIVsuper Invar)
(b) stability of zero expansion of Ho2Fe16Co (ΔT1—100-208 K, ΔT2—208-377 K, ΔT3—377-416 K) (c, d) magnetic ordered densities of state (DOS) of Ho2Fe17 (c) and Ho2Fe15Co2 (d) (E—electronic energy level, FIM—ferrimagnetic, DLM—disordered local moment) (e) changes of Fe magnetic moment and cell volume (V) of Ho2Fe16Co at 6g (MFe/Co—magnetic moment of Fe/Co atoms, T—temperature, μB—Bohr magnetron) (f) contribution of the magnetic moment (MFe) and magnetic order of the Fe sublattice to the cell volume (VM) (VM(T)—contribution of magnetic ordering to the unit cell volume, |Σ MFe|—magnetic moment of Fe sublattice. Inset in Fig.8f shows the |Σ MFe| as a function of Co content)
Fig.9  Anisotropic thermal expansion and cyclic properties of titanium-based shape memory alloys[40-42]
(a) evolution of macroscopic strain with temperature of rolled 60% (thickness reduction rate) Ti50.6Ni49.4 alloy sheet along RD, 22.5°, 33.5°, 45°, 67.5°, and TD after annealing for 60 min at 523 K[40] (RD—rolling direction, TD—transverse direction)
(b) Ni50.8Ti49.2 alloy through three steps rolling (CroR-15%-10%-5%: the thickness of the first rolling direction is reduced by 15%-the thickness in the vertical direction from the first rolling direction is reduced by 10%-thickness is reduced by 5% along the first rolling direction) to a thickness of 30% of the total thickness after the internal macroscopic thermal expansion change[41] (CroR—cross rolling, TE—thermal expansion)
(c) Ti22Nb CR (cold-rolled) plate along the rolling direction in eight cycles (cycle 01 Tmax (maximum temperature) = 350 oC, thermomechanical analyzer measurements were performed in cycle 02-08 at Tmax = 300 oC)[42] (Inset shows the transmission Kikuchi diffraction (TKD) band contrast (BC) + inverse pole figure (IPF) map inside a primary martensite lath in the sample heating to 350 oC)
Fig.10  Multi-component reinforcement designs and thermal expansion performances of xLFCS/Cu metal matrix composites
(a, b) enhanced metal matrix composites (MMC) with a single NTE material (a) and a multi-component NTE material (b)
(c, d) linear thermal expansions of LaFe10.5Co1.0Si1.5 (c), and six compositions of LaFe11.5 - x Co x Si1.5 (dashed line) and xLFCS (solid line) (d)
(e, f) MMC reinforced with a single NTE material (e) and a multi-component NTE material (f)
Fig.11  Thermal expansion control of different biphase alloy systems[14-16,45,94]
(a) zero thermal expansion dual-phase alloy obtained by synergistic combination of negative thermal expansion L phase (La(Fe, Co, Si)13) and positive thermal expansion α phase (α-(Fe, Co, Si)) (αCalc.—calculated S-3 ZTE (empty circle point line) is derived from L-phase and α phase thermal expansions)[14]
(b) thermal expansion behavior of LaFe0.939x Co0.061x Si0.0583x (x = 37.5, 47.5, 57.5, and 67.5, designated as S-1, S-2, S-3, and S-4, respectively)[14]
(c) macroscopic linear expansion of samples labeled S-3 (x = 0.03) to S-9 (x = 0.09) in Ho x Fe1 - x with x = 0.03, 0.04, 0.05, 0.07, and 0.09[15]
(d) linear thermal expansion curves of samples in (LaFe10.8CoSi1.2)100 - y -Cu y alloys where y = 0, 15, 25, 35, and 45[94]
(e) thermal expansion of Er2Fe14 + x B1 + 0.07x alloy compared to pure iron[16]
(f) cyclic thermal expansion properties of Fe2.85Mn0.15PtB0.25[45]
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