Hydrostatic Extrusion of Metal Matrix Composites

Lahaie, D. J.; Embury, J.D.

doi:10.1177/0021998303034506

Cited by 3 publications

(2 citation statements)

References 18 publications

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“…Moreover, the uniform deformation is conducive to the uniform distribution of tungsten and copper phases in W–Cu composites. The effect of hydrostatic pressure on the formability of a model W–Cu composites was investigated by Lahaie et al [ 126 ] and a resulting critical hydrostatic pressure criterion was estimated from slip line field theory. Besides, a very important effect of the stress state during hydrostatic extrusion of W–Cu composite has been proved.…”

Section: Deformation Densification Technologymentioning

confidence: 99%

Recent Advances in W–Cu Composites: A Review on the Fabrication, Application, Property, Densification, and Strengthening Mechanism

Zhang,

Yang,

Huang

et al. 2023

Adv Eng Mater

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Tungsten–copper (W–Cu) composite is a pseudoalloy prepared by powder metallurgy method with tungsten and copper as the main components, which are widely used in electrical contacts, electrical discharge machining electrodes, electronic packaging, aerospace, and military fields due to its good conductivity, thermal conductivity, high melting point, high electrical breakdown strength, low contact resistance, high welding resistance, and high heat resistance. Herein, the recent advances of W–Cu composites are reviewed systematically. First, the preparative techniques of W–Cu composites are introduced in detail, and their advantages and disadvantages are evaluated objectively. Second, an introduction of the main application fields and corresponding characteristics advantages for W–Cu composites are provided. Subsequently, the densification techniques and strengthening mechanisms and their effects on microstructure, mechanical properties, and physical properties of W–Cu composites are mainly discussed. Finally, based on a comprehensive review of W–Cu composites, its future development trends and potential research challenges are summarized and prospected.

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Section: Deformation Densification Technologymentioning

confidence: 99%

Recent Advances in W–Cu Composites: A Review on the Fabrication, Application, Property, Densification, and Strengthening Mechanism

Zhang,

Yang,

Huang

et al. 2023

Adv Eng Mater

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“…This can be fundamentally attributed to the generation of dislocations at the elastic discontinuities (e.g., reinforcing particles in composites) that interact with the dislocation activity and consequently slow down the void growth. Such beneficial effects have been exploited in various forming processes [190][191][192] to enhance the forming efficiency and formability of materials that would otherwise be difficult-to-form.…”

Section: Summary and Future Directionsmentioning

confidence: 99%

Void Nucleation and Growth from Heterophases and the Exploitation of New Toughening Mechanisms in Metals

2023

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Heterophases, such as precipitates, inclusions, second phases, or reinforcement particles, often drive void nucleation due to local incompatibilities in stresses/strains. This results in a significant life-limiting condition, as voids or their coalescence can lead to microcracks that reduce the ductility and fatigue life of engineering components. Continuum-mechanics-based analytical models have historically gained momentum due to their relative ease in predicting failure strain. The momentum of such treatment has far outpaced the development of theories at the atomic and micron scales, resulting in an insufficient understanding of the physical processes of void nucleation and growth. Evidence from the recent developments in void growth theories indicates that the evolution of voids is intrinsically linked to dislocation activity at the void–matrix interface. This physical growth mechanism opens up a new methodology for improving mechanical properties using hydrostatic pressurization. According to the limited literature, with a hydrostatic pressure close to 1 GPa, aluminium matrix composites can be made 70 times more ductile. This significant ductility enhancement arises from the formation of dislocation shells that encapsulate the heterophases and inhibit the void growth and coalescence. With further investigations into the underlying theories and developments of methods for industrial implementations, hydrostatic pressurization has the potential to evolve into an effective new method for improving the ductility and fatigue life of engineering components with further development.

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