Improving the mechanical properties of Fe – TiB2 high modulus steels through controlled solidification processes

Zhang, Han; Springer, Hauke; Aparicio-Fernández, Rosaura; Raabe, Dierk

doi:10.1016/j.actamat.2016.07.056

Cited by 63 publications

(12 citation statements)

References 27 publications

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“…76,77 In order to effectively improve the Young's modulus of AMCs, the generation of high modulus phases, the reinforcement phases with covalent and ionic interatomic bonds in aluminum alloys are preferred approaches according to the nature of stiffness. 78,79 Therefore, the in-situ method is better than the ex-situ method because the wettability between the in-situ formed phases and the aluminum matrix is significantly higher and is capable of forming clean and strong interfacial bonding in between. 80,81 However, the in-situ method is suitable for particulate-reinforced AMCs because the in-situ techniques are not capable of making continuous fiber-reinforced AMCs.…”

Section: Stiffness Improvement In Aluminumbased Compositesmentioning

confidence: 99%

A review on high stiffness aluminum-based composites and bimetallics

Amirkhanlou

2019

Critical Reviews in Solid State and Materials Sciences

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The Young's modulus of aluminum-based materials is one of the most important mechanical properties in controlling structural performance. The improvement of the Young's modulus of castable aluminum-based materials is essential for improving their competiveness in light weighting structural applications. Currently, there are limited options for cast aluminum alloys with outstanding Young's modulus. Also, for further stiffness improvement and thereby weight lightening, in-depth understanding of the relevant mechanisms for modulus improvement in aluminum alloys is necessary. This review focuses on the Young's modulus of cast aluminum-based composites, as well as aluminum alloys reinforced with continuous metallic fibers (bimetallic materials). The effect of different chemical elements in cast alloys, the constituents of in-situ and ex-situ formed aluminum matrix composites, and the wire-enhanced bimetallic materials on the Young's modulus of aluminum-based materials are reviewed. The Young's modulus of cast aluminum alloys can be improved by: (a) introducing high modulus reinforcement phasessuch as TiB 2 , SiC, B 4 C, and Al 2 O 3into aluminum by in-situ reactions or by ex-situ additions; and (b) forming bimetallic materials with metallic wire/bar reinforcement in the aluminum matrix. The performance of a stiff aluminum alloy depends on the volume fraction, size, and distribution of the high modulus phases as well as the interface between reinforcement and Al matrix. One of the major concerns is the reduction of the ductility of castings after adding specific high modulus phases to increase the Young's modulus. Further research into the improvement of Young's modulus and the ductility of aluminum alloys is necessary through proper selection of reinforcement, optimizing interface, and distribution of reinforcement.

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Section: Stiffness Improvement In Aluminumbased Compositesmentioning

confidence: 99%

A review on high stiffness aluminum-based composites and bimetallics

Amirkhanlou

2019

Critical Reviews in Solid State and Materials Sciences

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“…Various synthesis routes have been put into place to fabricate FeTiB 2 composites. 12,19,2629) Casting is a conventional and efficient route which can guarantee a clean interface, allow the tailoring of added elements as well as capable of casting large size ingots. However, there are two prominent issues which are clustering of TiB 2 reinforcements in Fe matrix 12) and density-induced floatation of the primary TiB 2 particles.…”

Section: Introductionmentioning

confidence: 99%

“…However, there are two prominent issues which are clustering of TiB 2 reinforcements in Fe matrix 12) and density-induced floatation of the primary TiB 2 particles. 19) Apparently, more elaborate process should be taken into consideration in order to obtain a homogenously TiB 2 -distributed Fe matrix composites by casting route. Other processes involving in in-situ chemical reactions, most of them is self-propagating high temperature synthesis which enables a clean interface and allow adjustment of fraction of reinforcements.…”

Section: Introductionmentioning

confidence: 99%

Spark Sintering of TiB<sub>2</sub> Reinforced Fe Matrix Composites with Both High Thermal Conductivity and Hardness, and Their Microstructural Characterizations

Matsugi

et al. 2020

Mater. Trans.

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TiB 2 reinforced Fe matrix composites were investigated for their potential as a new generation of hot work tools which are mainly characterized by high thermal conductivity and high hardness in comparison with conventional materials. In this work, Fe30 vol%TiB 2 composites were sintered at 1373 K for different holding times (0, 0.3, 0.6, 1.8 and 3.6 ks). Apart from Fe and TiB 2 , newly formed phases of Fe 2 B and TiC were found in all sintered compacts. A good Fe/TiB 2 interfacial cohesion was confirmed at atomic level at 0 ks, which was due to the occurrence of the special orientation relationship between {110} planes of Fe and f10 10g planes of TiB 2. The observation of dislocations in TiB 2 particles, attributed to the activation of slip systems, showed the plastic deformation ability of TiB 2 at high temperature. The reaction between Fe and TiB 2 was due to TiB 2 dissolution in Fe at 1373 K and different diffusion depth of B and Ti atoms in Fe. Consequently, B directly reacted with Fe, since the solubility of B atoms was low in both ¡-Fe and £-Fe. TiC probably precipitated from FeTiC solid solution along Fe grain boundaries in the cooling stage after sparking sintering, leading to a layer of Fe wrapping around TiB 2. Among all the compacts, the one sintered at 1373 K for 0.6 ks displayed the excellent properties which were comparable in Vickers hardness and 133% higher in thermal conductivity, compared with that of SKD61 as the commonly used practical material. This work provides a new perspective to fabricate a future generation of hot work tools.

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“…The automotive industry is currently seeking significant weight reduction for structural aluminium-based components in which Young's modulus (E) and yield strength (YS) are the main design criteria [1,2]. These alloys, generally used in cast form, must have high yield strength and materials improvement in past decades has focused almost exclusively on improvement of this parameter.…”

Section: Introductionmentioning

confidence: 99%

Atomic structure and interface chemistry in a high-stiffness and high-strength Al–Si–Mg/TiB2 nanocomposite

Amirkhanlu

Mostaed

et al. 2019

Materials Science and Engineering: A

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We investigate a new generation of aluminium alloys, Al-Si-Mg/TiB2 nanocomposites, with both high stiffness (Young's modulus 94 GPa) and high yield strength (322 MPa), designed for automotive applications. A significant weight reduction (>30%) can be achieved by these nanocomposites compared with conventional Al alloys in components designed for stiffness. The crystallography and distribution of TiB2 particles and β″ precipitates, as well as the chemistry and structure of Al/TiB2 interfaces, have been characterized at atomic scales. The TiB2 nanoparticles (average particle size ∼450 nm), the main cause of stiffness improvement, were homogeneously distributed within the Al-Si-Mg matrix. The interfaces between Al and TiB2 nanoparticles were mainly parallel to dense planes of the TiB2, including basal {0001}, prismatic {11¯00} and pyramidal {011¯1} planes. All facets show a transitional zone in the alloy matrix, roughly 1 nm in thickness. We also find a Cu-rich layer (∼2 at.%) on pyramidal {011¯1} facets. The β″ precipitates are the main cause of high yield strength and work in conjunction with TiB2 nanoparticles to produce an alloy with outstanding mechanical properties.

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Improving the mechanical properties of Fe – TiB2 high modulus steels through controlled solidification processes

Cited by 63 publications

References 27 publications

A review on high stiffness aluminum-based composites and bimetallics

A review on high stiffness aluminum-based composites and bimetallics

Spark Sintering of TiB<sub>2</sub> Reinforced Fe Matrix Composites with Both High Thermal Conductivity and Hardness, and Their Microstructural Characterizations

Atomic structure and interface chemistry in a high-stiffness and high-strength Al–Si–Mg/TiB2 nanocomposite

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