Processing and mechanical properties of novel Al-W composites with ordered mesostructure

Chiu, Po-Hsun; Nesterenko, V. F.

doi:10.1177/0021998316630802

Cited by 11 publications

(3 citation statements)

References 34 publications

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“…More recently, control of fragmentation of the RSM was attempted by varying the particle size and, even more interestingly, structure of the composite material, which can be changed replacing a powder with fibers . Composites with tungsten fibers embedded in aluminum were prepared using a combination of cold isostatic pressing (CIP) and HIP, which could be followed by an additional heat treatment to harden the aluminum matrix . Prepared materials contained mesostructures including tungsten fibers embedded in aluminum while being placed strategically in both hoop and axial directions, as shown in Figure .…”

Section: Structures Of Rsm and Methods Of Their Preparationmentioning

confidence: 99%

Reactive Structural Materials: Preparation and Characterization

Hastings

Dreizin

2017

Adv Eng Mater

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Reactive structural materials, which can serve both as structural elements as well as a source of chemical energy released upon initiation have emerged as an important class of metal-based composites for use in various energetic systems. Such materials rely on a variety of exothermic reactions, from oxidation to formation of metal-metalloid and intermetallic phases. The rates of these reactions are as important as the energy that may be released, in order for them to occur at the time scales compatible with the requirements of applications. Therefore, chemical composition, scale at which reactive components are mixed, and the structure and morphology of materials are important and can be controlled by the method of preparation and compaction of the composite materials. Methods of preparation of the composite structures are briefly reviewed as well as methods of characterization of their mechanical and energetic properties. In addition to common thermo-analytical and static mechanical property measurements, dynamic tests of mechanical properties as well as ignition and combustion experiments are necessary to understand the fragmentation, initiation, and heat release expected for these materials when they are stimulated by an impact, shock, or rapid heating. Reaction mechanisms are studied presently for the thin layers and small samples of reactive materials initiated in carefully designed experiments. In other experiments, impact and explosive initiation are characterized for larger material compacts in the conditions imitating practical scenarios. Examples of results describing thermal, impact, and explosive initiation of some of the reactive materials are presented.

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Section: Structures Of Rsm and Methods Of Their Preparationmentioning

confidence: 99%

Reactive Structural Materials: Preparation and Characterization

Hastings

Dreizin

2017

Adv Eng Mater

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“…An SRM designed in this fashion preserves intrinsic grain-scale properties of dissimilarity and reactivity from which a variety of fine fragmentation mechanisms could be anticipated. In a structural discontinuity mechanism [32][33][34][35][36], the grain-scale discontinuities in acoustic impedance, hardness and other physical properties dominated at the interfaces between dissimilar granular ingredients within an SRM solid. Consequently, on the two sides of an interface, explosive loading shock dynamics resulted in local differences in temperature, shear stress, strain and, later, acceleration from dissimilar inertia, leading to fine fragments.…”

Section: Introductionmentioning

confidence: 99%

Hetero‐blast from a structural reactive material cylinder under explosive loading

Zhang,

Yoshinaka,

Ripley

2024

Propellants Explo Pyrotec

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A structural reactive material (SRM) cylinder is considered here as a limiting case of a dense metallic energetic system in which a mixture of metal particles is consolidated to the theoretical maximum density excluding porosity, to possess both high energy density and mechanical strength. Dynamic fragmentation and free‐field explosion of a 103 mm inner diameter SRM cylinder charge is experimentally studied, with a wall thickness varying in a range of metal‐to‐explosive mass ratio M/C=1.3 to 4.0. Under explosive loading, the SRM cylinder produces a designated fragment size distribution divided into two groups: fine fragments with sizes on the order of 102 μm and below, and coarse fragments with sizes on the order ranging between 100‐101 mm. Prompt detonation shock‐induced reaction (DSIR) of the expanding cloud of high‐concentration fine fragments supplements the energy to enhance the primary blast as it propagates, while the coarse fragments form a high‐speed, high‐concentration metal momentum flux crossing the fireball and blast front to contribute to the total impulse loading to a nearby structure. Rapid impact‐induced reaction (IIR) of the secondary fragments from high‐speed coarse SRM fragments further enhances the reflected blast loading or generates a high interior explosion pressure as fragments perforate into the structure. The above distinctive characteristics of a unique hetero‐blast are coupled effectively in the near‐field range.

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“…Ren et al [6] studied the influences of W content on the dynamic mechanical properties, impact threshold and total energy release of Al/PTFE/W reactive materials by using Split Hopkinson Pressure Bar (SHPB). Chiu et al [7,8] prepared tubular high-density Al/W/fibre composites with high order axial and circumferential W fibres by the combination of cold isostatic pressing and hot isostatic pressing and studied the strength of the two samples under quasi-static compression. The quasi-static compressive tests of two kinds of PTFE/Al/W reactive materials were conducted by Xu et al [9]; the results show that the sintered sample has higher failure stress and fracture toughness than that of the unsintered sample.…”

Section: Introductionmentioning

confidence: 99%

Influence of wolfram fibre content on dynamic mechanical behaviour of aluminium/polytetrafluoroethylene composites

Liu

Tang

Han

et al. 2021

Materials Science and Technology

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Based on the traditional aluminium/polytetrafluoroethylene (Al/PTFE) (volume percentage ratio of PTFE and Al is 77.4%:22.6%) reactive materials, four types of specimens are prepared by adding wolfram (W) fibres with volume percentages of 0%, 4%, 16.3% and 29.6%, respectively. The dynamically experimental results show that the stress-strain curve can be divided into the elastic, hardening and failure stages. However, the impact reaction process of PTFE/Al/W fibre can be regarded as deformation, failure and combustion. When the volume percentage of W fibre is 29.6%, the failure strength reaches 295 MPa, which is due to the insufficient strength of the matrix rather than that of the contact position between the matrix and W fibre by combining with the SEM analysis.

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Processing and mechanical properties of novel Al-W composites with ordered mesostructure

Cited by 11 publications

References 34 publications

Reactive Structural Materials: Preparation and Characterization

Reactive Structural Materials: Preparation and Characterization

Hetero‐blast from a structural reactive material cylinder under explosive loading

Influence of wolfram fibre content on dynamic mechanical behaviour of aluminium/polytetrafluoroethylene composites

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