Improvement of Microstructure and Wear Property of Al–Bi Alloys by Nd Addition

Man, Tiannan; Zhang, Lin; Zhang, Xiang; Wang, Wenbin; Huang, Minghao; Wang, Engang

doi:10.1007/s11837-017-2613-2

Cited by 12 publications

(7 citation statements)

References 20 publications

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“…Therefore, both Zn and Cu resulted in a positive microstructural refining effect. It can be inferred that Cu and Zn affected the formation of the Bi droplets in the sense that the contact of the added elements may increase the nucleation rate of the minority phase, as demonstrated elsewhere [22][23][24]. Higher growth rates related to the Al-3.2 wt.% Bi-3.0 wt.% Zn and Al-3.2 wt.% Bi-3.0 wt.% Cu alloys also justify the resulting microstructures as being more refined.…”

Section: Resultsmentioning

confidence: 62%

“…In recent years, there has been an increase in the number of investigations regarding the addition of third elements [22][23][24] in monotectic alloys. Most of them emphasize the effects of these elements in restricting or not the segregation of the minority phase during solidification.…”

Section: Introductionmentioning

confidence: 99%

“…The addition of Cerium [22], Lanthanum [23], or Neodymium [24] resulted in microstructural refinement of the Al-Bi alloys. In these three cases, particles containing the added element are formed in contact with the Bi globules, which provide an increase in the nucleation rate of the minority phase.…”

Section: Introductionmentioning

confidence: 99%

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Evaluating Microstructure, Wear Resistance and Tensile Properties of Al-Bi(-Cu, -Zn) Alloys for Lightweight Sliding Bearings

Reyes

Garcia

Spinelli

2021

Metals

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One of the most important routes for obtaining Al-Bi-x monotectic alloys is directional solidification. The control of the thermal solidification parameters under transient heat flow conditions can provide an optimized distribution of the Bismuth (Bi) soft minority phase embedded into an Al-rich matrix. In the present contribution, Al-Bi, Al-Bi-Zn, and Al-Bi-Cu alloys were manufactured through this route with their microstructures characterized and dimensioned based on the solidification cooling rates. The main purpose is to evaluate the influence of typical hardening elements in Al alloys (zinc and copper) in the microstructure, tensile properties, and wear of the monotectic Al-Bi alloy. These additions are welcome in the development of light and more resistant alloys due to the growing demands in new sliding bearing designs. It is demonstrated that the addition of 3.0 wt.% Cu promotes microstructural refining, doubles the wear resistance, and triples the tensile strength with some minor decrease in ductility in relation to the binary Al-3.2 wt.% Bi alloy. With the addition of 3.0 wt.% Zn, although there is some microstructural refining, little contribution can be seen in the application properties.

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Section: Resultsmentioning

confidence: 62%

Section: Introductionmentioning

confidence: 99%

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Evaluating Microstructure, Wear Resistance and Tensile Properties of Al-Bi(-Cu, -Zn) Alloys for Lightweight Sliding Bearings

Reyes

Garcia

Spinelli

2021

Metals

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“…Such a composite microstructure with in situ crystalline spheres embedded into crystalline alloy matrix is normally formed in various immiscible alloys . The addition of other element, such as Nickel, into Niobium‐Yttrium alloy presents the capability of the formation phase‐separated glass which shows an improved plasticity and the hardness . It is well known that the content of the alloy element has a significant effect on the microstructure, morphology which finally determines the properties.…”

Section: Introductionmentioning

confidence: 99%

Rapid solidification of ternary Nb‐Y‐Ni immiscible alloys

Zheng

Liu

et al. 2020

Materialwissenschaft Werkst

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The rapid solidification experiments have been carried out for the Nb(45‐x)YxNi55 (x = 9, 19, and 27) alloys. The microstructure characterization shows the occurrence of the liquid‐liquid phase separation into the Niobium‐rich and Yttrium‐rich liquids. The Niobium‐rich spherical particles were embedded in the glassy Yttrium‐rich matrix for the alloy Nb36Y9Ni55, while glassy Yttrium‐rich ones were located in the glassy Niobium‐rich matrix for the alloy Nb18Y27Ni55. A structure of hierarchical separation was detected in the as‐quenched alloy Nb26Y19Ni55. The size distribution of the spherical particles in the as‐quenched Nb(45‐x)YxNi55 (x = 9 and 27) alloys ranges from several nanometers to sub micrometer and is close to the Gaussian distribution. The average diameters of the Niobium‐rich particles in the as‐quenched Nb36Y9Ni55 alloy and the Yttrium‐rich particles in the Nb18Y27Ni55 alloy are 0.23 μm and 0.15 μm, respectively. A dual‐glass structure in the as‐quenched Nb18Y27Ni55 alloy ribbon was determined by X‐ray diffraction and transmission electron microscopy.

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“…Such features at this stage of Al-Mg products are mainly related to the dendritic growth in metallic alloys. Various investigations demonstrated that the dendritic microstructure plays a notable role in porosity distribution, mechanical properties, corrosion and wear properties of foundry and cast products [13][14][15] .…”

Section: Introductionmentioning

confidence: 99%

Length Scale of the Dendritic Array Tailoring Strength of a 5052 Aluminum Alloy

et al. 2018

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The present research aims to characterize 5xxx alloy series, considering chemistries based on the commercial 5052 alloy with three Mg contents (2.4wt.%, 2.6wt.% and 3.2wt.%) through transient directional solidification experiments. Very representative incoming impurities to a given twin-roll casting procedure were reached. As such, the Si, Fe, Cu, Mn and Cr-contents in the tested samples typically trend in between the suitable alloying spectrum. Microstructural analyzes were performed using polarized light microscopy of samples taken from various ingot positions. Growth relationships between the secondary dendritic spacing (λ 2 ) and the growth velocity were determined. The 5052 alloys containing higher Mg content may induce a decrease in λ 2 for a certain growth velocity. The hardness values measured across the three directionally solidified castings were directly related to the λ 2 , which can be considered a fundamental variable affecting mechanical strength. For representative conditions vis-à-vis those employed in industry, it was shown that even relatively small changes in Mg content of the 5052 alloy may have some impact on λ 2 . These results open new ways to predict the final as-cast microstructure characterizing commercial 5052 alloy products, with a view to controlling not only the dendritic growth but also the Mg content during casting operations.

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Improvement of Microstructure and Wear Property of Al–Bi Alloys by Nd Addition

Cited by 12 publications

References 20 publications

Evaluating Microstructure, Wear Resistance and Tensile Properties of Al-Bi(-Cu, -Zn) Alloys for Lightweight Sliding Bearings

Evaluating Microstructure, Wear Resistance and Tensile Properties of Al-Bi(-Cu, -Zn) Alloys for Lightweight Sliding Bearings

Rapid solidification of ternary Nb‐Y‐Ni immiscible alloys

Length Scale of the Dendritic Array Tailoring Strength of a 5052 Aluminum Alloy

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