Effects of Cu addition on the microstructure and properties of the Al–Mn–Fe–Si alloy

Cao, Cheng; Chen, Dengbin; Fang, Xiaoyang; Ren, Jieke; Shen, Jianguo; Meng, Liang; Liu, Jiabin; Qiu, Lin; Fang, Youtong

doi:10.1016/j.jallcom.2020.155175

Cited by 14 publications

(3 citation statements)

References 33 publications

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“…In this study, AA7072 alloy was used as an interlayer to extend the corrosion life and attempt to increase the strength. In terms of strengthening mechanisms, the effects of the core are not discussed as they are not heat treatable and mainly dependent on work hardening (Cao et al, 2020). It has been shown that the brittle eutectic zone formed in the clad after brazing could induce stress concentration (Niu et al, 2019), crack initiation and extension due to its strain incompatibility with the matrix, which is consistent with the brittle fracture observed in Figure 3(c).…”

Section: Strengthening and Corrosion Mechanismssupporting

confidence: 58%

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Effect of brazing and artificial aging on the corrosion and strengthening behavior of a quad-layer Al alloy composite

Zhou,

Xia,

Gao

et al. 2024

ACMM

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Purpose This study aims to investigate the influence mechanism of brazing and aging on the strengthening and corrosion behavior of novel multilayer sheets (AA4045/AA7072/AA3003M/AA4045). Design/methodology/approach Polarization curve tests, immersion experiments and transmission electron microscopy analysis were used to study the corrosion behavior and tensile properties of the sheets before and after brazing and aging. Findings The strength of the sheet is weakened after brazing due to brittle eutectic phases, and recovered after aging due to enhanced precipitation strengthening in the AA7072 interlayer. The core of nonbrazed sheets cannot be protected due to the significant galvanic coupling effect between the intermetallic particles and the substrate. Brazing and aging treatments promote the redissolved of second phased and limit corrosion along the eutectic region in the clad, allowing the core to be protected. Originality/value AA7xxx alloy was added to conventional brazed sheets to form a novel Al alloy composite sheet with AA4xxx/AA7xxx/AA3xxx structure. The strengthening and corrosion mechanism of the sheet was proposed. The added interlayer can sacrificially protect the core from corrosion and improves strength after aging treatment.

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Section: Strengthening and Corrosion Mechanismssupporting

confidence: 58%

Section: Resultsmentioning

confidence: 99%

Effect of brazing and artificial aging on the corrosion and strengthening behavior of a quad-layer Al alloy composite

Zhou,

Xia,

Gao

et al. 2024

ACMM

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“…Thus, sufficient strength at temperatures ranging from ambient temperature to approximately 150 °C is required for Al cast alloys used in cylinder components of engines. The addition of Cu as an alloying element can improve the strength of Al–Si alloys, and Al–Si–Cu ternary alloys are generally used as conventional materials in cylinder heads fabricated via sand and gravity die casting processes [ 6 , 7 , 8 , 9 , 10 ]. One of the conventional Al–Si–Cu cast alloys is the AC2B alloy (denoted according to Japan Industry Standard: JIS), with a nominal composition of Al–6Si–3Cu (mass%) [ 5 ].…”

Section: Introductionmentioning

confidence: 99%

Precipitation Hardening at Elevated Temperatures above 400 °C and Subsequent Natural Age Hardening of Commercial Al–Si–Cu Alloy

Takata

Suzuki

et al. 2021

Materials

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The precipitation of intermetallic phases and the associated hardening by artificial aging treatments at elevated temperatures above 400 °C were systematically investigated in the commercially available AC2B alloy with a nominal composition of Al–6Si–3Cu (mass%). The natural age hardening of the artificially aged samples at various temperatures was also examined. A slight increase in hardness (approximately 5 HV) of the AC2B alloy was observed at an elevated temperature of 480 °C. The hardness change is attributed to the precipitation of metastable phases associated with the α-Al15(Fe, Mn)3Si2 phase containing a large amount of impurity elements (Fe and Mn). At a lower temperature of 400 °C, a slight artificial-age hardening appeared. Subsequently, the hardness decreased moderately. This phenomenon was attributed to the precipitation of stable θ-Al2Cu and Q-Al4Cu2Mg8Si6 phases and their coarsening after a long duration. The precipitation sequence was rationalized by thermodynamic calculations for the Al–Si–Cu–Fe–Mn–Mg system. The natural age-hardening behavior significantly varied depending on the prior artificial aging temperatures ranging from 400 °C to 500 °C. The natural age-hardening was found to strongly depend on the solute contents of Cu and Si in the Al matrix. This study provides fundamental insights into controlling the strength level of commercial Al–Si–Cu cast alloys with impurity elements using the cooling process after solution treatment at elevated temperatures above 400 °C.

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Realization of Large Scale, 2D van der Waals Heterojunction of SnS₂/SnS by Reversible Sulfurization

Wang

Cheng

et al. 2021

Small

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were prepared by direct exfoliation and transfer method, which is not scalable, and inefficient for device productions. Molecular beam epitaxy (MBE), in contrast, is a powerful technique to grow wafer-scale thin films with high quality, and it is also an attractive method for the growth of 2D heterojunctions in a large scale. [21] However, the possibility of growing one layer of 2D material on the other is restricted by the growth dynamics as well as the lattice mismatch between them. So far, successful MBE growth of 2D vdW heterojunctions is still rare, and usually limited to materials with similar structure and compositions, such as MoSe 2 /HfSe 2 , graphene/h-BN, bismuthene/BP-Bi. [22][23][24] Tin sulfides are known to have different chemically stable layered phases, i.e., SnS and SnS 2 . SnS has an orthorhombic crystal structure that possesses puckered honeycomb lattice with lattice constants of a = 4.04 Å, b = 4.31 Å, as shown in Figure 1a. [25][26][27][28][29] Such low-symmetry structure brings in strongly anisotropic electronic properties, and possible applications related with its in-plane ferroelectricity, piezoelectric, and nonlinear optical properties. [25,26,[30][31][32][33][34][35] Furthermore, SnS is a p-type semiconductor with indirect bandgap dependent on the film thickness, from 1.96 eV in the monolayer to 1.44 eV in six-layer films. [28] In contrast to SnS, the layer of SnS 2 exhibits hexagonal symmetry with lattice constants a = b = 3.65 Å, as shown in Figure 1b. [36][37][38][39] SnS 2 is a n-type semiconductor with larger indirect bandgap 2.18 eV in bulk and 2.41 eV in monolayer. [40] Although SnS and SnS 2 have completely different crystal structures including lattice constants and symmetry, they are both 2D vdW materials comprised by the same elements, with only different composition ratio. Thus, we consider it possible and attractive to fabricate 2D vdW heterojunctions of SnS 2 /SnS by direct sulfurization on SnS film which can be grown by MBE (Figure 1c).In this letter, we reported that few-layer SnS films with high quality and large scale can be synthesized on mica and Nbdoped SrTiO 3 (100) substrates by MBE growth. Moreover, we confirmed by the reflection high-energy electron diffraction (RHEED) and X-ray photoelectron spectroscopy (XPS) measurements that the top layer of SnS can be sulfurized to SnS 2 monolayer and the SnS 2 layer can recover to SnS by annealing SnS 2 /SnS without sulfur supply, suggesting the reversible formation of 2D vdW layered heterojunction of SnS 2 /SnS. Scanning tunneling microscope (STM) studies confirmed the surface atomic structure as well as the existence of moiré pattern, which can be attributed to the stacking between hexagonal SnS 2 monolayer and rhombohedral SnS layer. The scanning 2D van der Waals heterojunction provides an attractive opportunity for realizing novel electronic or optoelectronic devices. It remains challenging to realize high-quality heterostructures through scalable methods such as molecular epitaxy growth (MBE). Here, growth of few-lay...

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Effects of Cu addition on the microstructure and properties of the Al–Mn–Fe–Si alloy

Cited by 14 publications

References 33 publications

Effect of brazing and artificial aging on the corrosion and strengthening behavior of a quad-layer Al alloy composite

Effect of brazing and artificial aging on the corrosion and strengthening behavior of a quad-layer Al alloy composite

Precipitation Hardening at Elevated Temperatures above 400 °C and Subsequent Natural Age Hardening of Commercial Al–Si–Cu Alloy

Realization of Large Scale, 2D van der Waals Heterojunction of SnS₂/SnS by Reversible Sulfurization

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Effects of Cu addition on the microstructure and properties of the Al–Mn–Fe–Si alloy

Cited by 14 publications

References 33 publications

Effect of brazing and artificial aging on the corrosion and strengthening behavior of a quad-layer Al alloy composite

Effect of brazing and artificial aging on the corrosion and strengthening behavior of a quad-layer Al alloy composite

Precipitation Hardening at Elevated Temperatures above 400 °C and Subsequent Natural Age Hardening of Commercial Al–Si–Cu Alloy

Realization of Large Scale, 2D van der Waals Heterojunction of SnS2/SnS by Reversible Sulfurization

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Realization of Large Scale, 2D van der Waals Heterojunction of SnS₂/SnS by Reversible Sulfurization