Effects of Al2O3 Nanopowders on the Wear Behavior of NiTi Shape Memory Alloys

Şahin, Yusuf; Öksüz, Keri̇m Emre

doi:10.1007/s11837-013-0823-9

Cited by 11 publications

(10 citation statements)

References 17 publications

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“…To determine the relative density (%) of sintered compacts, the Archimedes' principle specified in the European Standard EN 99 (ISO 10545-3, 1991) [10] was employed and to assess the Rockwell B hardness of the Cu composite samples, a load of 60 kg-f was applied for a duration of 15 seconds. Hardness and density measurements were taken for each sample at least six times.…”

Section: Experimental Studymentioning

confidence: 99%

Al2O3 PARTICLE SIZE EFFECT ON REINFORCED CU COMPOSITES PRODUCED BY HIGH ENERGY MILLING

ÖKSÜZ

2023

Adıyaman Üniversitesi Mühendislik Bilimleri Dergisi

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Production of copper (Cu) composites with a reinforced Cu matrix using mechanical alloying with Aluminum oxide (Al2O3) particles of different sizes was achieved using high-energy ball milling procedure. The initial materials consisted of inert gas-atomized spherical electrolytic Cu powders containing 0.5 wt. % commercial Al2O3 powders, with particle sizes ranging from 10 µm to 1 µm. Cu powders with different particle sizes of Al2O3 were high-energy ball milled at 500 rpm for 3 hours to attain a consistent distribution of Al2O3 throughout in the Cu matrix. The powders that were high-energy ball milled were then subjected to cold-pressing at 500 MPa and isothermally sintered for 1.5 hours at 880°C in an Ar atmosphere. The fabricated copper composite materials were characterized using X-ray diffraction analysis (XRD), field emission scanning electron microscopy (FE-SEM), energy-dispersive X-ray spectroscopy (EDXS), density and macrohardness tests. The wear properties and mechanism were investigated through tribological pin-on-disc experiments, which revealed that the reinforcing effect was more significant when finely dispersed Al2O3 particles were combined into the Cu matrix compared to coarse Al2O3 particles.

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Section: Experimental Studymentioning

confidence: 99%

Al2O3 PARTICLE SIZE EFFECT ON REINFORCED CU COMPOSITES PRODUCED BY HIGH ENERGY MILLING

ÖKSÜZ

2023

Adıyaman Üniversitesi Mühendislik Bilimleri Dergisi

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“…The Vickers hardness value (VHN) was measured at a load of 1.96 N for the SiC/NiTi composites. The hardness values tend to increase due to the increasing amount of SiC in NiTi matrix to form more ceramic phases around grain boundaries [10].…”

Section: Microhardness and Wear Performance Of Sic/niti Compositesmentioning

confidence: 99%

“…Significant increase in wear rate of the composite was observed. One reason is that ultra-fine sized SiC particles prevent the movement of dislocations in the NiTi matrix through a dispersion-strengthening mechanism [10]. Also, 5 wt.% SiC particle-reinforced NiTi demonstrated lower wear than that of unreinforced NiTi composites for all applied loads.…”

Section: Microhardness and Wear Performance Of Sic/niti Compositesmentioning

confidence: 99%

“…NiTi alloys have been fabricated using various powder metallurgy methods, such as self-propagating high temperature synthesis (SHS) [8,9], conventional sintering (CS), [10,11], hot isostatic pressing (HIP) [12], metal or powder injection molding (MIM) [13], spark plasma sintering (SPS) [14], and the space holder technique (SHT) [15][16][17]. The literature reviews have demonstrated that equiatomic NiTi alloy exhibits high mechanical and wear resistance.…”

Section: Introductionmentioning

confidence: 99%

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Processing and characterization of porous SiC/NiTi alloys for biomedical applications

Şi̇mşi̇r¹,

Akkan²,

Öksüz³

2021

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NiTi shape memory alloys have attracted significant attention due to their unique shape memory effect, superelasticity, and excellent mechanical performance. In addition, the fact that NiTi alloys have high resistance to cavitation and corrosion makes them ideal candidate materials in advanced tribological and biomedical applications. The NiTi alloy composite reinforced by fine grain-sized SiC particles was successfully fabricated using powder metallurgy process. In this process, elemental Ni-Ti metal powder mixes reinforced with 0, 1, and 5 % SiC particulates were pressed uniaxial and sintered at 1100 • C in an argon atmosphere for 3 h. The effect of the SiC additions on the mechanical properties, porosity degree, and phase formation of the porous NiTi alloys was studied. After characterization, the bioactivity of the SiC/NiTi exposed samples was evaluated in simulated body fluid test. The microstructure characterization and phase identification of the apatite layer formed in SBF on their surface were also evaluated.

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“…Near-equiatomic Ti-Ni alloys are widely used in engineering, aeronautics, dentistry, and medical fields because of their superior shape memory effect and superelasticity [1,2]. But, Ni-Ti instruments exhibit a lower microhardness (303-362 VHN) compared to stainless steel materials (522-542 VHN) [3,4].…”

Section: Introductionmentioning

confidence: 99%

Diffusion Kinetics of Binary Ti-Ni Shape Memory Alloys

et al. 2017

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In this work, the boriding of binary Ti-Ni shape memory alloys was carried out in a solid medium at 1173 and 1273 K for 2, 4, and 8 h using the powder pack method with Ekabor-Ni powders. The boride layer was characterized by optical microscopy and scanning electron microscopy. The obtained results show that boride layer thickness increases with the increasing boriding temperature and time. Depending on temperature and boride layer thickness, the diffusion process is thermally activated, with the mean value of the activation energy being close to 67 kJ/mol.

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Effects of Al2O3 Nanopowders on the Wear Behavior of NiTi Shape Memory Alloys

Cited by 11 publications

References 17 publications

Al2O3 PARTICLE SIZE EFFECT ON REINFORCED CU COMPOSITES PRODUCED BY HIGH ENERGY MILLING

Al2O3 PARTICLE SIZE EFFECT ON REINFORCED CU COMPOSITES PRODUCED BY HIGH ENERGY MILLING

Processing and characterization of porous SiC/NiTi alloys for biomedical applications

Diffusion Kinetics of Binary Ti-Ni Shape Memory Alloys

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