Morphology and size effects on densification and mechanical behavior of sintered powders from Al-Si and Al-Cu casting alloys

Bonatti, Rodrigo S.; Meyer, Yuri A.; Bortolozo, Ausdinir D.; Costa, Diego; Osório, Wislei R.

doi:10.1016/j.jallcom.2019.01.374

Cited by 19 publications

(11 citation statements)

References 50 publications

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“…However, the dendritic spacings were deformed, and after four rolling passes, the average of these arm spacings was maintained. A similar observation was reported when Al-based alloy powders were investigated [ 28 ]. These microstructural parameters associated with other ones are responsible for the resulting mechanical strengths [ 28 ].…”

Section: Resultssupporting

confidence: 85%

Interfacial Characteristics of 6061/AZ31B Composites in Multi-Pass Rolling

Yang

Jin

et al. 2022

Materials

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An Al 6061/Mg AZ31B composite plate with good bonding and excellent comprehensive mechanical properties was prepared through solid-liquid cast-rolling bonding (SLCRB). The microstructure evolution and mechanical behavior of Al/Mg composite plates under different rolling passes were studied. The results showed that with the increase of rolling passes, the bonding layer of the composite plate was crushed, and the base material on both sides of the substrate gradually grew towards the broken part of the bonding layer. The microstructure on both sides of the substrate extended along the rolling direction and was dynamically recrystallized to a certain extent. In the Mg substrate, because the preheating temperature was higher than its recrystallization temperature, with the increase of rolling passes, the grains in Mg substrate were crystallized. When the rolling passes reached the fourth pass, complete recrystallization basically took place in the Mg substrate. With the change of the internal structure and bonding layer on both sides of the substrate, the mechanical properties of the composite plate can be improved gradually. The tensile strength increased from 136 MPa before rolling to 190 MPa at the fourth pass, and the shear strength increased from 74 MPa to 98 MPa, with growth rates of about 40% and 32%, respectively. The elongation of the composite plate decreased from 6.3% to 5.4%, a decrease of about 1%.

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Section: Resultssupporting

confidence: 85%

Interfacial Characteristics of 6061/AZ31B Composites in Multi-Pass Rolling

Yang

Jin

et al. 2022

Materials

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“…On the other hand, the peaks that appear at ~ 28°, 48°, 56°, 77°, and 88° indicate the presence of the eutectic Si phase in the Bragg planes (111), ( 220), (311), (331), and (422). These results are consistent with other investigations of AlSi alloys as well as sintered compounds of these [35][36][37] Weaker peaks at approximately 41°, 42°, and 69° corresponding to the (220) and ( 222) Bragg planes indicating the minority presence of Al2Cu [38]. [38].…”

Section: Microstructural Characterization Of Aluminum Alloy Castingssupporting

confidence: 92%

“…On the other hand, the peaks that appear at~28 • , 48 • , 56 • , 77 • , and 88 • indicate the presence of the eutectic Si phase in the Bragg planes (111), ( 220), (311), (331), and (422). These results are consistent with other investigations of AlSi alloys as well as sintered compounds of these [35][36][37]. Figure 5 and Table 2 show the experimental results of the XRD patterns of the four samples studied (sand mold and binder jetting mold in the outer and central zones).…”

Section: Microstructural Characterization Of Aluminum Alloy Castingssupporting

confidence: 89%

Comparative Study on Microstructure and Corrosion Resistance of Al-Si Alloy Cast from Sand Mold and Binder Jetting Mold

Sastre

Cabezón

Abia

et al. 2021

Metals

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This investigation is focused on the corrosion evaluation of an as-cast Al-Si alloy, obtained by two different casting methods: traditional sand casting and three-printing casting, using a binder jetted mold. The experimental results are discussed in terms of chemical composition, microstructure, hardness, and corrosion behavior of two different casting parts. The microstructure and composition of the sample before and after the corrosion tests was analyzed using light microscopy (OM), scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDX) and X-ray diffraction (DRX). The corrosion of the two processed castings was analyzed using anodic polarization (PA) test and electrochemical impedance spectroscopy (EIS) in an aerated solution of 3.5% by weight NaCl, similar to the seawater environment. After the corrosion process, the samples were analyzed by inductively coupled plasma/optical emission spectrometry (ICP/OES); the composition was used to determine the chloride solution after immersion times. The sample processed by binder jetting mold showed higher corrosion resistance with nobler potentials, lower corrosion densities, higher polarization resistance, and more stable passive layers than the sample processed by sand casting. This improvement of corrosion resistance could be related to the presence of coarse silicon particles, which decrease of cathodic/anodic ratio and the number of micro-galvanic couples, and the lower amount of intermetallic β Al-Fe-Si phase observed in cast alloy solidified in binder jetting mold.

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“…However, since it is nobler than the matrix, it promotes local dissolution and reduces the corrosion resistance of alloys [2,3]. It is also well known that the formation of Al 2 Cu plays an important role in many Al-Cu-based cast alloys [4][5][6][7][8][9]. The distribution of the Al 2 Cu phase in the interdendritic spacing affects both the mechanical and corrosion behaviour of the alloys [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

“…The distribution of the Al 2 Cu phase in the interdendritic spacing affects both the mechanical and corrosion behaviour of the alloys [4][5][6][7]. This effect is not proportional, meaning that the microstructural refinement level and the cathode-to-anode area ratio strongly affect the mechanical-to-corrosion response [4,8,9]. At the same time, the intermetallic Al 2 Cu phase is itself susceptible to selective corrosion, and when immersed in acidic, neutral, and alkaline solutions, its surface is transformed into a highly porous metallic copper [2,10].…”

Section: Introductionmentioning

confidence: 99%

Orthophosphoric acid solutions of sodium orthovanadate, sodium tungstate, and sodium molybdate as potential corrosion inhibitors of the Al2Cu intermetallic phase

Kwolek

Dychtoń

Pytel

2019

J Solid State Electrochem

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Orthophosphoric acid solutions of sodium orthovanadate, sodium tungstate, and sodium molybdate are tested as potential corrosion inhibitors of the Al 2 Cu intermetallic phase. Corrosion inhibition is observed for 0.2 M solutions of Na 3 VO 4 and Na 2 WO 4 by increasing the pH to > 2. When the pH is < 2, the aforementioned salts increase the corrosion rate of the intermetallic phase. A 0.2 M solution of Na 3 VO 4 causes the precipitation of vanadium phosphate on the surface of the Al 2 Cu phase at pH = 1.

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Morphology and size effects on densification and mechanical behavior of sintered powders from Al-Si and Al-Cu casting alloys

Cited by 19 publications

References 50 publications

Interfacial Characteristics of 6061/AZ31B Composites in Multi-Pass Rolling

Interfacial Characteristics of 6061/AZ31B Composites in Multi-Pass Rolling

Comparative Study on Microstructure and Corrosion Resistance of Al-Si Alloy Cast from Sand Mold and Binder Jetting Mold

Orthophosphoric acid solutions of sodium orthovanadate, sodium tungstate, and sodium molybdate as potential corrosion inhibitors of the Al2Cu intermetallic phase

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