Effect of sintering temperature on microstructure, phase evolution, thermo-mechanical properties of spark plasma sintering of NiTi alloy

IF 5.3 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology Pub Date : 2025-04-14 DOI:10.1016/j.surfcoat.2025.132152

Sneha Samal , Mohit Chandra , Wei Li , Stanislav Habr , Jaromír Kopeček , Ivo Stachiv , Petr Šittner

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Abstract

This study examines the significant effects of sintering temperatures on the microstructure and the thermal, mechanical, and dynamic mechanical properties of NiTi alloys. The compaction of polycrystalline Ni50Ti50 (at.%) powders via spark plasma sintering (SPS) at various temperatures. The starting powder, with a particle size of 20 to 63 μm, was compacted at a fixed pressure of 50 MPa. Our findings indicate that the consolidated alloy exhibits stable phases of NiTi, such as austenite and martensite, at different sintering temperatures. Notably, both compactness and hardness improve as the sintering temperature increases. Higher temperatures lead to decreased porosity, resulting in a denser structure with a chemical composition of Ni_47.1Ti_52.9 (at.%). The grain size distribution also narrows with increased temperatures, highlighting microstructural evolution. Moreover, the samples displayed remarkable shape memory behavior and exceptional thermo-mechanical properties, achieving a maximum compactness of 99.8 % at 1150 °C. This research thoroughly investigates the influence of sintering temperature on microstructural characteristics, phase transformations, and shape memory behavior, underscoring the potential of NiTi alloys for various applications.

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来源期刊

Surface & Coatings Technology 工程技术-材料科学：膜

CiteScore

10.00

自引率

11.10%

发文量

921

审稿时长

19 days

期刊介绍： Surface and Coatings Technology is an international archival journal publishing scientific papers on significant developments in surface and interface engineering to modify and improve the surface properties of materials for protection in demanding contact conditions or aggressive environments, or for enhanced functional performance. Contributions range from original scientific articles concerned with fundamental and applied aspects of research or direct applications of metallic, inorganic, organic and composite coatings, to invited reviews of current technology in specific areas. Papers submitted to this journal are expected to be in line with the following aspects in processes, and properties/performance: A. Processes: Physical and chemical vapour deposition techniques, thermal and plasma spraying, surface modification by directed energy techniques such as ion, electron and laser beams, thermo-chemical treatment, wet chemical and electrochemical processes such as plating, sol-gel coating, anodization, plasma electrolytic oxidation, etc., but excluding painting. B. Properties/performance: friction performance, wear resistance (e.g., abrasion, erosion, fretting, etc), corrosion and oxidation resistance, thermal protection, diffusion resistance, hydrophilicity/hydrophobicity, and properties relevant to smart materials behaviour and enhanced multifunctional performance for environmental, energy and medical applications, but excluding device aspects.