Microstructure and wear behaviour of aluminium alloys containing embedded nanoscaled lead dispersoids

Bhattacharya, Victoria; Chattopadhyay, K.

doi:10.1016/j.actamat.2004.01.020

Cited by 63 publications

(24 citation statements)

References 28 publications

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“…It has already been reported that Al and Pb have been found to form supersaturated Al(Pb) solid solution during high-energy mechanical milling even though they have positive heat of mixing. [38][39][40] In addition, it has also been reported that the sizes of the embedded Pb nanoparticles in Al [41] and embedded Bi nanoparticles in Al-Cu-Fe, [42] which are well-known immiscible systems, have also been found to be increased during fretting wear test. These are reported to be due to pipe diffusion, i.e., particles are interconnected by dislocations and they can have diffusion through dislocations.…”

Section: ½2mentioning

confidence: 92%

“…These are reported to be due to pipe diffusion, i.e., particles are interconnected by dislocations and they can have diffusion through dislocations. [41] These experimental evidences clearly indicate that during mechanical working or friction, mutual solid solubility of immiscible system can be increased substantially. The mechanisms responsible for the increase of solid solubility in immiscible system have been proposed to be consisting of two factors: (a) atomic mixing due to continuous shearing of atomic planes during milling-induced plastic deformation, i.e., ballistic diffusion, and (b) interdiffusion of the constituent elements that can increase substantially when the size of particle becomes lesser than a critical size.…”

Section: ½2mentioning

confidence: 96%

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Formation and Stability of Pb-Sn Embedded Multiphase Alloy Nanoparticles via Mechanical Alloying

Khan

Devi

Biswas

2015

Metall Mater Trans A

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The present paper describes the preparation, characterization, and stability of Pb-Sn multiphase alloy nanoparticles embedded in Al matrix via mechanical alloying (MA). MA is a solid-state processing route, which can produce nanocrystalline phases by severely deforming the materials at high strain rate. Therefore, in order to understand the effect of the increasing interface as well as defects on the phase transformation behavior of Pb-Sn nanoparticles, Pb-Sn multiphase nanoparticles have been embedded in Al by MA. The nanoparticles have extensively been characterized using X-ray diffraction and transmission electron microscope. The characterization reveals the formation of biphasic as well as single-phase solid solution nanoparticles embedded in the matrix. The detailed microstructural and differential scanning calorimetry studies indicate that the formation of biphasic nanoparticles is due to size effect, mechanical attrition, and ballistic diffusion of Pb and Sn nanoparticles embedded in Al grains. Thermal characterization data reveal that the heating event consists of the melting peaks due to the multiphase nanoparticles and the peak positions shift to lower temperature with the increase in milling time. The role of interface structure is believed to play a prominent role in determining the phase stability of the nanoparticle. The results are discussed in the light of the existing literature.

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Section: ½2mentioning

confidence: 92%

Section: ½2mentioning

confidence: 96%

Formation and Stability of Pb-Sn Embedded Multiphase Alloy Nanoparticles via Mechanical Alloying

Khan

Devi

Biswas

2015

Metall Mater Trans A

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“…The adhesive-type wear mechanism was observed by Pathak and Mohan 2 and confirmed by Bhattacharya and Chattopadhyay. 5 Significant reduction of the friction coefficient and wear was also obtained in Al-In 7 and Al-Bi 3 alloys. Also the bimetallic dispersoids of Sn and Pb were produced using this process.…”

Section: Introductionmentioning

confidence: 79%

“…This process allows to produce the microand nano-scaled dispersoids in the alloys. Bhattacharya et al [3][4][5][6] established the good tribological properties under mild wear condition of the nano-embedded Al alloys obtained in such a process. The effect of particle's size on the tribological properties is most interesting.…”

Section: Introductionmentioning

confidence: 97%

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Positron annihilation and tribological studies of nano-embedded Al alloys

et al. 2015

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Positron annihilation studies of aluminium alloys with nanodispersions of insoluble elements, i.e., In, Sn, Pb and Au were reported. The alloys were obtained using a rapid solidification process. For all alloys, except that with Au, the average diameter of nanoparticles in aluminium matrix was 100 nm, and variance of the size distribution was above 50 nm. Positron annihilation studies reveal the presence of monovacancies or divacancies, which were located at the interface between nanoparticles and the matrix. In the as-cast reference pure aluminium sample as well as the aluminium and gold alloy dislocations were identified as well. The isothermal annealing of the obtained alloys and measurement of the annihilation characteristic, i.e., S-parameter, allow us to determine the activation energy of grain boundary migration, which for the alloys was higher by the factor of four than for the reference sample. The measurements of friction parameters for the alloys confirmed the results reported by the other authors that, the friction coefficient was lower by the factor of about two and the specific wear rate was by the factor of about fifty higher than the reference sample. The present study confirmed the attractive positron affinity of the nanoparticles of In, Sn, Pb and Au compared to aluminium matrix.

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Effect of Surface Mechanical Attrition Treatment on Surface Topography and Dry Sliding Wear Performance of AA7075‐T6

Yarar,

Erturk,

Karabay

2024

Adv Eng Mater

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Surface roughness significantly impacts the service life of materials, particularly in relation to fatigue and wear behavior. This study investigates the effects of surface mechanical attrition treatment (SMAT) on the wear performance and surface topography of AA7075‐T6 aluminum alloy. Experimental investigations are conducted using a specially designed vibration table to apply SMAT at low speeds, varying shot amount, and shot diameter. Surface roughness is measured using a 3D optical profilometer, and wear performance is evaluated through friction coefficient, wear rate, and microstructural analysis via scanning electron microscope. The results highlight several key findings. First, SMAT demonstrates the capability to yield smoother surfaces compared to equivalent processes, enhancing performance and applicability in engineering contexts. Second, SMATed samples exhibit increased surface roughness compared to untreated samples, underscoring the influence of SMAT on surface topography and its potential implications for wear resistance and frictional behavior. The comparative analysis shows that SMAT treatment increases surface roughness from 0.14 μm to a maximum of 0.24 μm. Finally, a notable reduction in friction coefficient, up to 22%, is observed in SMATed AA7075‐T6 samples, indicating the effectiveness of SMAT in improving tribological properties and enhancing component longevity subjected to frictional forces.

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Microstructure and wear behaviour of aluminium alloys containing embedded nanoscaled lead dispersoids

Cited by 63 publications

References 28 publications

Formation and Stability of Pb-Sn Embedded Multiphase Alloy Nanoparticles via Mechanical Alloying

Formation and Stability of Pb-Sn Embedded Multiphase Alloy Nanoparticles via Mechanical Alloying

Positron annihilation and tribological studies of nano-embedded Al alloys

Effect of Surface Mechanical Attrition Treatment on Surface Topography and Dry Sliding Wear Performance of AA7075‐T6

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