The Gain of Low Thermal Expansivity via Phase Transition in Electroformed Invar

Park, Yong Bum; Kim, In Gyeong

doi:10.3390/coatings8050169

Cited by 9 publications

(3 citation statements)

References 14 publications

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“…10,23,29 In addition, the homogeneous bbc to fcc phase transition in nanostructured Fe-Ni alloy films may lead to their low thermal expansivity. 34 The successive thermal expansion curves (0 °C-150 °C) of the electrodeposited Invar alloy films before and after heat treatment are demonstrated in Fig. 14c.…”

Section: Resultsmentioning

confidence: 99%

Fabrication of Large-Sized Invar Alloy Film with Low Thermal Expansion by Pulse Reverse Electrodeposition

Yu,

Zhong,

et al. 2023

J. Electrochem. Soc.

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Invar alloy film with low thermal expansion is a key substrate for high-resolution organic light-emitting diodes (OLEDs). The preparation of Invar alloy film by electrodeposition has attracted increasing attention due to its low cost and simple process. In this work, a large-sized (8×10 cm) uniform Fe-Ni alloy film was fabricated by pulse reverse electrodeposition. The effects of the electrodeposition parameters on the chemical composition and microstructure of Fe-Ni alloy films were investigated. Results showed that greater Ni2+/Fe2+ in the electrolyte, lower pulse frequency (f), smaller reverse pulse coefficient (x), and lower electrodeposition temperature (T) favored the iron content. The Invar alloy film (64 wt.% Fe) was electrodeposited at T = 50°C, x = 0.2, f = 10 Hz, and Ni2+/Fe2+ = 1.9 when the average pulse current density was 30 mA/cm2. The structure of the film was composed of a mixture of fcc and bcc phases, where (110) and (111) preferential orientations were predominant. After heat treatment in H2 at 800°C for 120 min, the bcc phase transformed into the fcc phase, and the grain size increased (>2 μm). As a result, the coefficient of thermal expansion of the film decreased from 11×10-6 to 1.5×10-6/°C, which is close to the standard for commercial application

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Section: Resultsmentioning

confidence: 99%

Fabrication of Large-Sized Invar Alloy Film with Low Thermal Expansion by Pulse Reverse Electrodeposition

Yu,

Zhong,

et al. 2023

J. Electrochem. Soc.

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“…Because FMMs are typically a few tens of microns thick, Invar alloys for FMMs also need to be very thin. The target thickness of the alloys is typically produced by either cold rolling or electroplating [7,8]. Electroplating is advantageous in the production of thin-film Invar alloys [8,9].…”

Section: Introductionmentioning

confidence: 99%

“…The target thickness of the alloys is typically produced by either cold rolling or electroplating [7,8]. Electroplating is advantageous in the production of thin-film Invar alloys [8,9]. However, cold rolling is still widely used because it is suitable for the mass production of metal sheets with high strength and homogeneous chemical composition.…”

Section: Introductionmentioning

confidence: 99%

Evolution of Microstructure, Mechanical Properties and Residual Stress of a Cold Rolled Invar Sheet Due to Heat Treatment

Park

Kim

et al. 2022

Metals

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Invar alloy possesses a uniquely low coefficient of thermal expansion, making it an ideal material for fine metal masks. To manufacture fine metal masks, Invar alloys are often cold-rolled, during which residual stress develops. Heat treatment is an effective means to control residual stress that develops within Invar sheets after cold rolling, but the treatment should be carried out with care. In this article, a comprehensive study on the effect of heat treatment on the residual stress, microstructure, and mechanical properties of a cold-rolled Invar sheet is reported. We show that while both recovery and recrystallization are effective means of reducing residual stress, substantial microstructural changes and, therefore, notable changes in mechanical properties and residual stress, occur after recrystallization. Moreover, residual stress release due to recrystallization can be affected by microstructure and texture prior to heat treatment as these factors play a significant role in recrystallization.

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Enhancement in Physical Properties of Silver-Doped Fe–Ni Invar Nano-alloy Using Chemical Reduction Method

Hassan

Munir

Ahmad

et al. 2021

J Supercond Nov Magn

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The Gain of Low Thermal Expansivity via Phase Transition in Electroformed Invar

Cited by 9 publications

References 14 publications

Fabrication of Large-Sized Invar Alloy Film with Low Thermal Expansion by Pulse Reverse Electrodeposition

Fabrication of Large-Sized Invar Alloy Film with Low Thermal Expansion by Pulse Reverse Electrodeposition

Evolution of Microstructure, Mechanical Properties and Residual Stress of a Cold Rolled Invar Sheet Due to Heat Treatment

Enhancement in Physical Properties of Silver-Doped Fe–Ni Invar Nano-alloy Using Chemical Reduction Method

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