Evolution of sludge particles in secondary die-cast aluminum alloys as function of Fe, Mn and Cr contents

Ferraro, Stefano; Fabrizi, Alberto; Timelli, Giulio

doi:10.1016/j.matchemphys.2014.12.050

Cited by 64 publications

(48 citation statements)

References 32 publications

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“…In order to get quantitative description of matrix structure (identification) it may be necessary to apply computer image analysis. The applicability and value of these methods in matrix tests are obvious [8,9,10,11].…”

Section: Methods For the Detection Of Defects In Reinforcement And Mamentioning

confidence: 99%

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Methods of the Detection and Identification of Structural Defects in Saturated Metallic Composite Castings

Gawdzińska¹

2017

Archives of Foundry Engineering

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Diagnostics of composite castings, due to their complex structure, requires that their characteristics are tested by an appropriate description method. Any deviation from the specific characteristic will be regarded as a material defect. The detection of defects in composite castings sometimes is not sufficient and the defects have to be identified. This study classifies defects found in the structures of saturated metallic composite castings and indicates those stages of the process where such defects are likely to be formed. Not only does the author determine the causes of structural defects, describe methods of their detection and identification, but also proposes a schematic procedure to be followed during detection and identification of structural defects of castings made from saturated reinforcement metallic composites. Alloys examination was conducted after technological process, while using destructive (macroscopic tests, light and scanning electron microscopy) and non-destructive (ultrasonic and X-ray defectoscopy, tomography, gravimetric method) methods. Research presented in this article are part of author's work on castings quality.

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Section: Methods For the Detection Of Defects In Reinforcement And Mamentioning

confidence: 99%

“…Inclusions are principally tested by standard microscopic methods [8,9,10]. Due to the presence of reinforcement in the composite, macroscopic tests and defectoscopic X-ray and ultrasonic tests may have limited application and only in relation to large inclusions.…”

Section: Methods For the Detection Of Defects In Reinforcement And Mamentioning

confidence: 99%

Methods of the Detection and Identification of Structural Defects in Saturated Metallic Composite Castings

Gawdzińska¹

2017

Archives of Foundry Engineering

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“…The polished specimens were etched using a sulphuric acid solution at 70 • C to more easily detect the α-Fe phase by image analyzer. According to the results in Reference [29], only Fe-rich particles over 10 µm in diameter were selected as primary phase and, thus, considered for a characterization of sludge. The worn out surfaces and the wear mechanisms were not studied in the present work.…”

Section: Microstructural Investigationsmentioning

confidence: 99%

“…Ferraro et al [29] found for similar alloys that the distribution of the α-Fe particles' size shows a bimodal distribution; in such work, the "α 1 -Fe" and "α 2 -Fe" labels are used to indicate the particles larger than 10 µm and those ranging from few microns up to~10 µm, respectively ( Figure 3). While the smaller α 2 -Fe particles are generally referred to as secondary intermetallic compounds, the coarser α 1 -Fe ones, comparable in size to the α-Al cells, are considered as primary and, thus, defined as sludge particles [22,23].…”

Section: Microstructural Analysismentioning

confidence: 99%

Design of Wear-Resistant Diecast AlSi9Cu3(Fe) Alloys for High-Temperature Components

Timelli

Fabrizi

Vezzù

et al. 2019

Metals

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Type AlSi9Cu3(Fe) alloy has been modified by alloying with iron, manganese, and chromium elements to develop wear-resistant diecast hypoeutectic Al-Si-Cu alloys that can be applied for high-temperature applications. Several alloys have been produced by varying iron, manganese, and chromium levels (0.80, 1.00, 1.20 wt.% for Fe; 0.25, 0.40, 0.55 wt.% for Mn, and 0.06, 0.10 wt.% for Cr). Brinell hardness measurements and pin-on-disk wear tests have been conducted from room temperature up to 200 • C. The microstructural changes that occurred with the different alloying levels have been quantitatively examined by metallographic and image analysis techniques. The results showed how the increasing content of the Fe, Mn, and Cr promoted the precipitation of both primary and secondary Fe-enriched particles, mainly with polyhedral, blocky, and star-like morphologies. These compounds showed high hardness that is not affected by chemical composition and morphology variation. At high temperatures, the diecast alloys always showed lower average hardness and wear resistance, especially at 200 • C; however, a greater amount of Fe-rich particles can compensate the alloy softening.

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“…In addition, according to [21], the sludge factor can be correlated to the area fraction of the intermetallic particles and not to their morphology, so the former parameter was calculated by means of image analysis technique. It was measured an average area fraction of α-Al(Fe,Mn,Cr)Si intermetallic phase of about 0.6 % and a particle density of 56 particles/mm 2 .…”

Section: Microstructural Analysis and Morphological Analysis Of Intermentioning

confidence: 99%

Investigation of mechanical properties of AlSi3Cr alloy

Tocci

Pola

Montesano

et al. 2017

Frattura Ed Integrità Strutturale

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In the present paper, microstructural and mechanical properties of an innovative AlSi3Mg alloy were studied. Particularly, the effect of the addition of Cr and Mn on tensile strength and impact toughness was evaluated. In fact, the presence of these elements leads to the formation of an intermetallic phase with a globular or polyhedral morphology. It was therefore investigated the role played by Cr-Mn containing particles in the failure mechanism and the influence of the heat treatment parameters. Moreover, tensile and impact tests were performed on A356 samples in T6 condition, whose results were compared with the performance of the innovative alloy. Considering the static properties, the innovative alloy showed remarkable values of tensile strength, while ductility was improved only after heat treatment optimization. Poor impact toughness values were measured and the microstructural analysis confirmed the presence of coarse intermetallics, acting as crack initiation and propagation particles, on the fracture surfaces.

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Evolution of sludge particles in secondary die-cast aluminum alloys as function of Fe, Mn and Cr contents

Cited by 64 publications

References 32 publications

Methods of the Detection and Identification of Structural Defects in Saturated Metallic Composite Castings

Methods of the Detection and Identification of Structural Defects in Saturated Metallic Composite Castings

Design of Wear-Resistant Diecast AlSi9Cu3(Fe) Alloys for High-Temperature Components

Investigation of mechanical properties of AlSi3Cr alloy

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