Solidification of Metal Matrix Composites

Stefanescu, Doru M.

doi:10.1007/978-3-319-15693-4_15

Cited by 5 publications

(5 citation statements)

References 87 publications

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“…Present data are shown as black circles and are offset horizontally within the estimated error range of v -1/4 ⋅ G -1/2 , to ease visibility of error bars. Regression lines correspond to: (i) metallic systems where ρ solute /ρ solvent ≠ 1 (Al-Cu [65,70,72,73,77], Al-Ni [54,74], Al-Si [75,80,83], Al-Li [78], Bi-Mn [84,85], Cu-Mn [79,82], and (ii) non-metallic systems where ρ solute /ρ solvent ≈ 1 (SCN-Camphor [66] and SCN-Acetone [82]. Shaded regions about each regression line represent 95% confidence intervals.…”

Section: Discussionmentioning

confidence: 99%

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Directional solidification of aqueous TiO2 suspensions under reduced gravity

et al. 2017

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Porous materials exhibiting aligned, elongated pore structures can be created by directional solidification of aqueous suspensions-where particles are rejected from a propagating ice front and form interdendritic, particle-packed walls-followed by sublimation of the ice and sintering of the particle walls. Theoretical models that predict dendritic lamellae spacing-and thus wall and pore width in the final materials-are currently limited due to an inability to account for gravitydriven convective effects during solidification. Here, aqueous suspensions of 10-30 nm TiO 2 nanoparticles are solidified on parabolic flights under micro-, lunar, and Martian gravity and compared to terrestrially-solidified samples. After ice sublimation and sintering, all resulting TiO 2 materials exhibit elongated lamellar pores replicating the ice dendrites. Increasing the TiO 2 fraction in the suspensions leads to decreased lamellar spacing in all samples, regardless of gravitational acceleration. Consistent with previous studies of microgravity solidification of binary metallic alloys, lamellar spacing decreases with increasing gravitational acceleration. Mean lamellar spacing for 20 wt.% TiO 2 nanoparticles suspensions under micro-, lunar, Martian, and terrestrial gravity are, respectively: 50±8, 34±11, 30±6, and 23±9 μm, indicating that gravity-driven convection strongly affects lamellae spacing under terrestrial gravity conditions. Gravitational effects on lamellar spacing are highest at low TiO 2 fractions in the suspension; for 5 wt.% TiO 2

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Section: Discussionmentioning

confidence: 99%

“…Systems in which ρ solute /ρ solvent ≈ 1, show less dependence of λ 1 on gravity-induced con- The steady-state boundary layer height , which is an approximation of the height of the concentration gradient from the interface to the bulk concentration [65], is taken as:…”

Section: Microgravity Solidification Of Binary Alloysmentioning

confidence: 99%

Directional solidification of aqueous TiO2 suspensions under reduced gravity

et al. 2017

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“…The impact of reinforcement on the solidification process in SMA-reinforced SHMMCs encompasses a range of factors, including how the wettability of the reinforcement affects the solidified microstructure of the composite [101,102], how the reinforcement affects the viscosity and fluidity of the melts during nucleation and growth [103][104][105][106], and how micro-segregation occurs during solidification [103]. When SMAs are presented in the liquid matrix, i.e., Sn-Bi, they can have several effects on the solidification of castings: acting as a solute and diffusion barrier, thereby altering the curvature of the solid-liquid interface; catalyzing heterogeneous nucleation of the solid phase from the melt on the SMA, which reduces the grain size; reducing the latent heat required for solidification, thereby increasing the solidification rate; decreasing the viscosity and fluidity of the melt and giving it thixotropic properties under certain conditions; restricting fluid convection because of the narrow interstices between the SMAs, which influences the solidification structure; affecting morphological instabilities such as planar-to-cellular dendritic solidification; influencing the dendrite structure; affecting grain size because of the heterogeneous nucleation or restricted spaces between the SMAs that restrict growth; and affecting micro-segregation in the matrix [102].…”

Section: The Impact Of Reinforcement On the Solidification Process In...mentioning

confidence: 99%

Shape Memory Alloy Reinforced Self-Healing Metal Matrix Composites

2023

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This paper reviews the synthesis, characterization, healing assessment, and mechanics of NiTi and other shape memory alloy (SMA)-reinforced self-healing metal matrix composites (SHMMCs). Challenges to synthesizing and characterizing the SMA-reinforced SHMMCs and the strategies followed to overcome those challenges are discussed. To design the SMA-reinforced SHMMCs, it is necessary to understand their microstructural evolution during melting and solidification. This requires the knowledge of the thermodynamics of phase diagrams and nonequilibrium solidification, which are presented in this paper for a model self-healing composite system. Healing assessment provides information about the autonomous and multicycle healing capability of synthesized SHMMCs, which ultimately determines their success. Different techniques to assess the degree of healing of SHMMCs are discussed in this paper. Strategies are explored to find the optimum volume fraction of SMA wires needed to yield the matrix and prevent damage to the SMA wires for the most effective healing. Finally, major challenges, knowledge gaps, and future research directions, including the need for autonomous and multicycle healing capability in SMA-reinforced SHMMCs, are outlined.

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“…An acceptable explanation may be that large-sized TiC/NbC particles are engulfed by the advancing proeutectic austenite interface in a similar manner engulfment of dispersed ex situ particles occur during the manufacturing of metal matrix composites (MMCs) [70,71]. Then, both smaller TiC and solute particles are pushed by the interface, thereby retarding growth (refining morphology), and will appear and precipitate at the austenite/eutectic interface due to constitutional undercooling where agglomeration and clustering can occur.…”

Section: Carbidementioning

confidence: 99%

Development and Performance of High Chromium White Cast Irons (HCWCIs) for Wear–Corrosive Environments: A Critical Review

Fashu,

Trabadelo

2023

Metals

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There is a huge demand for high-performance materials in extreme environments involving wear and corrosion. High chromium white cast irons (HCWCIs) display better performance than many materials since they are of sufficient hardness for wear protection and can be tailored in chemical compositions to improve corrosion resistance; however, their performance is often still inadequate. This article reviews the chemical composition and microstructure design aspects employed to tailor and develop HCWCIs with combined corrosion and wear resistance. The performance of these alloys under wear and corrosion is reviewed to highlight the influence of these parameters in the industry. Existing challenges and future opportunities, mainly focusing on metallurgical alloy development aspects like chemical composition, casting, and heat treatment design, are highlighted. This is followed by suggestions for potential developments in HCWCIs to improve the performance of materials in these aggressive environments. Many variables are involved in the design to obtain suitable microstructures and matrix composition for wear–corrosion resistance. Computational modeling is a promising approach for optimizing multi-design variables; however, reliable field performance data of HCWCIs in wear–corrosion environments are still inadequate. Quantitative evaluation of the wear–corrosion performance of HCWCIs requires the development of laboratory and field tests using standard conditions like abrasive type and sizes, severity of loading, slurry velocity, pH, and temperature to develop wear–corrosion maps to guide alloy development.

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Solidification of Metal Matrix Composites

Cited by 5 publications

References 87 publications

Directional solidification of aqueous TiO2 suspensions under reduced gravity

Directional solidification of aqueous TiO2 suspensions under reduced gravity

Shape Memory Alloy Reinforced Self-Healing Metal Matrix Composites

Development and Performance of High Chromium White Cast Irons (HCWCIs) for Wear–Corrosive Environments: A Critical Review

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