Microstructure evolution in Fe-based-aluminide metallic–intermetallic laminate (MIL) composites

Wang, Yu; Vecchio, Kenneth S.

doi:10.1016/j.msea.2015.10.019

Cited by 53 publications

(15 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In a Fe-Al diffusion couple, Fe2Al5 would be the first-formed and dominate intermetallic phase at 600 o C due to its fast growth kinetics [27]. A very thin layer of FeAl3 may also appear at the aluminum interface [17]. Other Fe-Al intermetallics, including FeAl2, FeAl and Fe3Al, would remain neglectable at 600 o C due to extremely slow growth kinetics [27].…”

Section: Growth Kinetics and Design Of Fabrication Processmentioning

confidence: 99%

See 1 more Smart Citation

Design, fabrication and characterization of FeAl-based metallic-intermetallic laminate (MIL) composites

et al. 2019

Self Cite

View full text Add to dashboard Cite

FeAl-based MIL composites of various iron alloys were fabricated with an innovative "multiple-thin-foil" configuration and "two-stage reaction" strategy. Alternating stacked metal foils were reactive sintered via SPS at 600 o C and 1000 o C to grow intermetallics. The "multiple-thin-foil" configuration reduces reaction time, enables local chemical composition control and allows metal/intermetallic combinations, which cannot be produced via the conventional methods. Fe-FeAl, 430SS-FeAl, and 304SS-FeAl MIL composites can be synthesized with desired metallic/intermetallic ratios, where FeAl is the single intermetallic phase present in the composites. Microstructure analysis via SEM, EDS, and EBSD confirms phase identification and reveals the formation of transition layers. The transition layer, which incorporates the composition gradient between the metal (Fe, 430SS or 304SS) and the FeAl intermetallic phase, provides a gradual change in mechanical properties from the metal to intermetallic layers, and further functions as a chemical barrier into which other undesired intermetallics dissolve. Driven by diffusioncontrolled growth, grains in the transition layers and FeAl regions exhibit ordered arrangement and sintering textures. Hardness profiles from the metal layer to FeAl region 2 reveal the correlation between local mechanical properties and local chemical compositions. In compression testing, the compressive strength can reach 2.3 GPa with considerable plasticity, establishing the best mechanical properties of any MIL composites synthesized to date.Metal-intermetallic laminate (MIL) composites are produced via incorporating layers of ductile metals into strong, but brittle intermetallics for optimizing mechanical behaviors.Generally, aluminide-intermetallics possess ordered crystalline structures with high specific modulus and high specific compressive strength, but often very limited plasticity or toughness. Reinforcing these intermetallics with particles, fibers or layers of ductile metals can enhance the toughness [1], making the materials more efficient for structural applications.MIL composites are typically synthesized via hot pressing alternating stacked metal foils so that intermetallic layers form as the result of interdiffusion and chemical reaction, while an appropriate pressure ensures intimate contact between the sheets of metal foils. The selection of the foil composition and thickness can determine the physical and mechanical properties of the MIL composites so that the specific performance requirements can be 3 fulfilled. The ability to tailor composite microstructure, and the low cost of the initial metallic foils make MIL composites ideal as commercially scalable structural materials, suitable for aerospace applications that require lightweight materials with high specific properties. By tuning the geometry of the initial metal foils, MIL composites can be synthesized into complex shapes, such as rods, tubes or cones, for specific platforms. In addition, multi-functionality can be incorporated...

show abstract

Section: Growth Kinetics and Design Of Fabrication Processmentioning

confidence: 99%

“…available intermetallics limits the ability to tune the properties of the materials. In order to lower the cost and optimize strength and ductility for MIL composites, Ni-Al [14][15][16] and Fe-Al [17][18][19] systems, which process ductile intermetallic phases, have begun to attract more attention in recent years.…”

mentioning

confidence: 99%

Design, fabrication and characterization of FeAl-based metallic-intermetallic laminate (MIL) composites

et al. 2019

Self Cite

View full text Add to dashboard Cite

show abstract

“…There are a series of studies on the mechanical response of laminated compositesbasedonTi-Al [69],Ti-Cu [70],Ti-Ni [71],Ni-Al [72],Cu-Al [73],Ti-Nb [74],Fe-Al [75,76] and Fe-Cu [77] systems. Table 2 shows the room temperature tensile properties of these laminated composites.…”

Section: Interfacial Reaction Phasementioning

confidence: 99%

Multiscale Hierarchical Structure and Laminated Strengthening and Toughening Mechanisms

Liu¹,

Huang²,

Li³

et al. 2018

Lamination - Theory and Application

View full text Add to dashboard Cite

Metal matrix composites with multiscale hierarchical structure and laminated structure have been developed to provide a novel route to achieve high strength, toughness and ductility. In this chapter, a lot of scientific research has been carried out in the preparation, processing, properties and application of metal matrix composite. Many toughening mechanisms and fracture behavior of composites with multiscale hierarchical structure and laminated structure are overviewed. It is revealed that elastic property and yield strength of laminated composites follow the "rule of average." However, the estimation of fracture elongation and fracture toughness is complex, which is inconsistent with the "rule of average." The fracture elongation of laminated composites is related to the layer thickness size, interface, gradient structure, strain hardening exponent, strain rate parameter and tunnel crack, which are accompanied with crack deflection, crack blunting, crack bridging, stress redistribution, local stress deformation, interfacial delamination crack and so on. The concept of laminated composites can be extended by applying different combination of individual layer, and provides theoretical as well as experimental fundamentals on strengthening and toughening of metal matrix composites.

show abstract

“…Intermetallics are distinctive compounds with strong interatomic binding force, high melting point, good creep resistance, and oxidation resistance as well as excellent electrical, magnetic, and acoustic properties [1][2][3][4][5]. Many efforts have been spent to develop the Ti-Al [6][7][8][9], Ni-Al [10][11][12], and Fe-Al [13][14][15] intermetallics, which have been used as high temperature structural materials, superconducting materials, and corrosion resistant coatings. However, most intermetallics exhibit a macroscopically brittle failure at ambient temperature, which severely limits their wide applications.…”

Section: Introductionmentioning

confidence: 99%

Effect of Nb on the Microstructure and Mechanical Properties of Ti2Cu Intermetallic through the First-Principle Calculations and Experimental Investigation

Cheng

Yun

Wang

et al. 2020

Metals

View full text Add to dashboard Cite

Through the first-principle calculations based on density functional theory and experimental investigation, the structural stability elastic properties and mechanical properties of Ti2Cu and Ti18Cu5Nb1 intermetallics were studied. The first-principle calculations showed that the ratio of bulk modulus to shear modulus (B/G) and Poisson’s ratio (ν) of Ti2Cu and Ti18Cu5Nb1 intermetallics were 2.03, 0.288, and 2.22, 0.304, respectively, indicating that the two intermetallics were ductile. This was confirmed by the compression tests, which showed that the plastic strain of both intermetallics was beyond 25%. In addition, the yield strength increased from the 416 to 710 MPa with the addition of Nb. The increase in strength is the result of three factors, namely covalent bond tendency, fine grain strengthening, and solid solution strengthening. This finding gives clues to design novel intermetallics with excellent mechanical properties by first-principle calculations and alloying.

show abstract

Microstructure evolution in Fe-based-aluminide metallic–intermetallic laminate (MIL) composites

Cited by 53 publications

References 29 publications

Design, fabrication and characterization of FeAl-based metallic-intermetallic laminate (MIL) composites

Design, fabrication and characterization of FeAl-based metallic-intermetallic laminate (MIL) composites

Multiscale Hierarchical Structure and Laminated Strengthening and Toughening Mechanisms

Effect of Nb on the Microstructure and Mechanical Properties of Ti2Cu Intermetallic through the First-Principle Calculations and Experimental Investigation

Contact Info

Product

Resources

About