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Poster De Conférence Année : 2023

Effect of annealing treatment on mechanical properties of nanostructured metallic films deposited by pulsed laser deposition

Résumé

The design of metallic thin film with controlled composition and microstructure has become increasingly important for industry applications, involving strong mechanical solicitations. Specifically, metallic glasses (MGTFs) and high entropy alloys thin films (HEATFs) have shown a great potential due to their unique combination of large mechanical properties such as yield strength (3 GPa) and ductility (10%) [1,2]. However, the relationship microstructure-mechanical properties are not fully understood since the morphological control is often limited by the most employed sputtering deposition. In this field, Pulsed Laser Deposition (PLD) offers the possibility to widely control the morphology of the films by simply changing the process parameters, affecting the growth mechanisms from atom-by-atom to cluster-assembled growth regimes. Recently, PLD has shown a large potential for the deposition ZrCu MGTFs and CoCrCuFeNi HEATFs reporting large and tunable mechanical properties such as an elastic modulus and hardness of 175 and 11 GPa [2]. Here, we explore the possibility to further nanostructuring PLD deposited ZrCu compact and nanogranular MGTFs by performing annealing treatments from 300 up to 550°C, while investigating the devitrification process and the evolution of the mechanical properties. Structural characterization shows that compact films remain amorphous up to 420°C, while the crystallization process of nanogranular films is completed at 420°C due to the combination of high interface density, free volume and O content [3]. We show that the mechanical properties increase with the annealing temperature due to the progressive crystallization reaching a plateau upon complete crystallization with elastic modulus and hardness up to 180 and 14 GPa, respectively. Furthermore, we show that compact films have residual tensile stress from 169 to 691 MPa whose magnitude increase as a function of the temperature due to nanocrystalline phase nucleation followed by grain growth. On the other hand, nanogranular films show a maximum residual stress of 1.1 GPa at 420°C followed by a decrease at higher annealing temperatures, indicating a complete crystallization. Overall, we show that PLD in combination with post-thermal annealing can generate different families of metallic films with varying nanoscale morphologies, resulting in tunable mechanical properties and thermal stability with potential as structural coatings. References: 1. Y. Zou et al., Nat. Commun., 6, 7748, 2015. 2. M. Ghidelli et al., Acta Mater., 213, 116955, 2021. 3. F. Bignoli et al., Mater. Des., 221, 110972, 2022.
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Dates et versions

hal-04308528 , version 1 (27-11-2023)

Identifiants

  • HAL Id : hal-04308528 , version 1

Citer

Francesco Bignoli, Saqib Rashid, Edoardo Rossi, P. Djemia, Marco Sebastiani, et al.. Effect of annealing treatment on mechanical properties of nanostructured metallic films deposited by pulsed laser deposition. International Conference on Metallurgical Coatings and Thin Films, May 2023, San Diego (CA), United States. ⟨hal-04308528⟩
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