In-situ synthesis, microstructure and mechanism of SiC/Al–Mg–Si composites: Effects of Mg addition

Jiao, Yuhong; Zhu, Jianfeng; Li, Xuelin; Wang, Fen; Zhao, Xu; Shi, Chunjie; Abdul, Waras; Lü, Bo

doi:10.1016/j.ceramint.2020.04.070

Cited by 18 publications

(6 citation statements)

References 25 publications

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“…As follows from Table , criterion (eq ) is obeyed for the Ni 3 Al/Ni–Al system. Eqs and provide a new design rule for ISCNCs, − GP-zones, − or superalloys. − …”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Interfacial Energy of Strained Coherent Interfaces and a New Design Rule To Select Phase Combinations for In Situ Coherent Nanocomposites

Kaptay

2023

Langmuir

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Nanocomposites show the best performance when their reinforcing phase precipitates in situ from a matrix upon heat treatment and when coherency between the matrix and the reinforcing phase is preserved even upon coarsening the precipitated particles. In this paper, first a new equation is derived for the interfacial energy of strained coherent interfaces. From here, a new design rule is derived in a form of a new dimensionless number to select phase combinations for in situ coherent nanocomposites (ISCNCs). This is calculated from the molar volume mismatch between the two phases, their elastic constants, and the modeled interfacial energy between them. When this dimensionless number is smaller than a critical value, ISCNCs are formed. The critical value of this dimensionless number is found here using experimental data for the Ni−Al/Ni 3 Al superalloy. The validity of the new design rule was confirmed on the Al−Li/Al 3 Li system. An algorithm is suggested to apply the new design rule. Our new design rule can be simplified to more easily available initial parameters: if the matrix and the precipitate have the same cubic crystal structure the precipitate is expected to form ISCNCs with that matrix if their standard molar volumes differ less than by about 2%.

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“…As follows from Table , criterion (eq ) is obeyed for the Ni 3 Al/Ni–Al system. Eqs and provide a new design rule for ISCNCs, − GP-zones, − or superalloys. − …”

Section: Resultsmentioning

confidence: 99%

“…In situ coherent nanocomposites (ISCNCs), − GP-zones, − and superalloys − are important classes of multiphase solid materials. Coherency between the phases in these materials is their most important feature ensuring their outstanding properties.…”

Section: Introductionmentioning

confidence: 99%

Interfacial Energy of Strained Coherent Interfaces and a New Design Rule To Select Phase Combinations for In Situ Coherent Nanocomposites

Kaptay

2023

Langmuir

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“…It was stated that the competitive Ostwald ripening, which occurred among the grains of the magnesium solid‐solution during sintering was responsible for the dissolution of the fine intermetallic. During sintering of the metallic powders, the energy of the alloy system will naturally tend towards the formation of larger crystals at the expense of small crystals [48, 49]. Thus, when sintering is above eutectic temperature (437 °C), the alloy gradually transforms from solid phase into liquid phase.…”

Section: Resultsmentioning

confidence: 99%

Reactive sintering principle and compressive properties of porous AZ91 magnesium alloy foams produced by powder metallurgy approach

Agbedor

Yang

Chen

et al. 2022

Materialwissenschaft Werkst

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Porous magnesium alloy foams have gained tremendous interest from scientists because of their super lightweight, unique mechanical and physical properties. Despite numerous studies suggesting these advanced materials for structural and functional applications, their manufacturing processes remain poorly understood. In this paper, the porous Mg‐9 wt. %Al‐1 wt. % Zn alloy foam was prepared through the reactive sintering principle (i. e. the element metal powder reaction principle) by using the powder metallurgical method that is combined with a pore‐making agent. The chemical and phase compositions of the cell wall microstructure were investigated by X‐ray diffraction and scanning electron microscope equipped with energy dispersive spectrometer. The compressive properties of the foams were evaluated by quasi‐static compression testing. The results of the analysis reveal that low‐temperature sintering can produce qualitative magnesium alloy foams with good mechanical properties by taking advantage of the intermetallic/or intermediate compounds which are formed in the cell wall through metal elements powder diffusion and reaction. Particularly, the foam samples sintered at 380 °C for 12 h gave the best compressive properties owing to the alloy intermetallic contents and the relative density of the foams.

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“…Efficient approaches, such as the addition of alloying elements [ 4 , 5 ], surface modification [ 6 , 7 ], and novel fabrication processes [ 8 , 9 ] can be used to improve wettability and regulate interfacial reactions. In recent studies, the innovative fabrication methods have focused on the interface which has been promoted a large improvement on the mechanical properties of ceramic-reinforced Al matrix composites; for instance, accumulative roll bonding [ 10 , 11 ], powder metallurgy technique [ 12 , 13 ], liquid metal infiltration [ 14 , 15 ], selective laser melting [ 16 , 17 ], plasma spraying [ 18 , 19 ], in situ growth [ 20 , 21 ], and special casting. All the above routes enhanced wettability or inhibited interfacial reactions, improving the properties to some extent.…”

Section: Introductionmentioning

confidence: 99%

“…Depending on previous work [ 21 , 26 , 27 , 28 ], in situ synthesized SiC/Al matrix composite has enormous potential in solving the ultimate interfacial predicament. Meanwhile, the in situ synthesizing SiC in a range from the nanometer to micrometer scale has good dispersion in the matrix alloy.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties of Al Matrix Composite Enhanced by In Situ Formed SiC, MgAl2O4, and MgO via Casting Process

Jiao

Zhu

et al. 2021

Materials

Self Cite

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Al matrix composite, reinforced with the in situ synthesized 3C–SiC, MgAl2O4, and MgO grains, was produced via the casting process using phenolic resin pyrolysis products in flash mode. The contents and microstructure of the composites’ fracture characteristics were analyzed by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Mechanical properties were tested by universal testing machine. Owing to the strong propulsion formed in turbulent flow in the pyrolysis process, nano-ceramic grains were formed in the resin pyrolysis process and simultaneously were homogeneously scattered in the alloy matrix. Thermodynamic calculation supported that the gas products, as carbon and oxygen sources, had a different chemical activity on in situ growth. In addition, ceramic (3C–SiC, MgAl2O4, and MgO) grains have discrepant contents. Resin pyrolysis in the molten alloy decreased oxide slag but increased pores in the alloy matrix. Tensile strength (142.6 ± 3.5 MPa) had no change due to the cooperative action of increased pores and fine grains; the bending and compression strength was increasing under increased contents of ceramic grains; the maximum bending strength was 378.2 MPa in 1.5% resin-added samples; and the maximum compression strength was 299.4 MPa. Lath-shaped Si was the primary effect factor of mechanical properties. The failure mechanism was controlled by transcrystalline rupture mechanism. We explain that the effects of the ceramic grains formed in the hot process at the condition of the resin exist in mold or other accessory materials. Meanwhile, a novel ceramic-reinforced Al matrix was provided. The organic gas was an excellent source of carbon, nitrogen, and oxygen to in situ ceramic grains in Al alloy.

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In-situ synthesis, microstructure and mechanism of SiC/Al–Mg–Si composites: Effects of Mg addition

Cited by 18 publications

References 25 publications

Interfacial Energy of Strained Coherent Interfaces and a New Design Rule To Select Phase Combinations for In Situ Coherent Nanocomposites

Interfacial Energy of Strained Coherent Interfaces and a New Design Rule To Select Phase Combinations for In Situ Coherent Nanocomposites

Reactive sintering principle and compressive properties of porous AZ91 magnesium alloy foams produced by powder metallurgy approach

Mechanical Properties of Al Matrix Composite Enhanced by In Situ Formed SiC, MgAl2O4, and MgO via Casting Process

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