Dynamic consolidation of metal powders

Gourdin, William H.

doi:10.1016/0079-6425(86)90003-4

Cited by 117 publications

(40 citation statements)

References 37 publications

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“…Consolidation of powders utilizing shock waves has been successfully used to prepare fully dense compacts of metals, alloys, and ceramics, while retaining the structural characteristics of the starting materials. 13 Shock waves can be generated by the impact of a projectile accelerated using a gas gun or explosive loading devices or by detonating explosive charges in contact with the powder container. The gas-gun loading technique is generally used for making small-scale bulk materials to study the effects of compact characteristics as a function of more controlled shock-compression conditions, while explosive compaction is more amenable to the production of large-scale samples.…”

Section: Introductionmentioning

confidence: 99%

Explosive shock processing of Pr₂Fe₁₄B/α–Fe exchange-coupled nanocomposite bulk magnets

et al. 2005

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Explosive shock compaction was used to consolidate powders obtained from melt-spun Pr 2 Fe 14 B/␣-Fe nanocomposite ribbons, to produce fully dense cylindrical compacts of 17-41-mm diameter and 120-mm length. Characterization of the compacts revealed refinement of the nanocomposite structure, with approximately 15 nm uniformly sized grains. The compact produced at a shock pressure of approximately 1 GPa maintained a high coercivity, and its remanent magnetization and maximum energy product were measured to be 0.98 T and 142 kJ/m 3 , respectively. The compact produced at 4-7 GPa showed a decrease in magnetic properties while that made at 12 GPa showed a magnetic softening behavior. However, in both of these cases, a smooth hysteresis loop implying exchange coupling and a coercivity of 533 kA/m were fully recovered after heat treatment. The results illustrate that the explosive compaction followed by post-shock heat treatment can be used to fabricate exchange-coupled nanocomposite bulk magnets with optimized magnetic properties.

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Section: Introductionmentioning

confidence: 99%

Explosive shock processing of Pr₂Fe₁₄B/α–Fe exchange-coupled nanocomposite bulk magnets

et al. 2005

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“…Magnetic forces have been used for more than two decades in high rate metal forming [1] and powder compaction [2] . Magnetic compaction was first invented at UMIST in 1976, and later developed for a wide range of application.…”

Section: Introductionmentioning

confidence: 99%

Low-voltage electromagnetic compaction of metal and ceramic powders

Meng

Huang

Sun

2007

J. Wuhan Univ. Technol.-Mat. Sci. Edit.

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Low-voltage electromagnetic compaction (EMC) was used to compact metal powders (Cu) and ceramic powders (TiO 2 ) in the indirect way. It was found that the density of the metal powder parts compacted by low-voltage EMC varied linearly with the discharging voltage in the range investigated. But for ceramic powders, the discharging voltage has an optimal value. Under the value, the density increases as discharging voltage rises, but beyond the value the trend is reverse. The experimental results show that the density of the metal parts decreases gradually along press direction. And the density of the ceramic parts decreases with the advancement of the aspect ratio h/d (height /diameter). In addition, repetitive compaction can improve the density of both metal and ceramic parts and reduce the effects of aspect ratio on the density.

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“…Shock consolidation is a unique method that offers the possibility of fabricating bulk materials while retaining the fine structure of the starting powders [2,3]. However, due to the rapid densification rate, the consolidated samples suffer from poor inter-particle bonding and severe cracking.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of tungsten-copper composites by hot-shock consolidation

Zhou¹,

Chen²,

Gao³

2012

AIP Conference Proceedings

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Abstract. In this work a novel approach for producing tungsten-copper composites has been investigated. This approach combines high temperature preheating technique and underwater shock consolidation. By combining these two processes W-Cu composites with mass ratio of 9:1 were produced. The powders were first blended by mechanically alloying by a planetary ball mill. Prior to application of shock wave, the elemental powders were preheated to different temperatures, with the highest temperature up to 1000ºC, by heat released from a self-propagating high-temperature synthesis reaction. A water column was used to prolong the duration of shock pulse and to uniformize the distribution of shock pressure, which is of benefit to reduce the cracks in sample induced by shock wave. The results showed that a fine-grained 90W/10Cu composite with no cracks could be obtained by hot-shock consolidation at a preheating temperature of 1000ºC. The consolidated specimens were then characterized by SEM analysis, X-ray diffraction and micro-hardness testing. The relative density and hardness of the recovered sample are 97%T.D. and 493.5 HV, respectively.

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Dynamic consolidation of metal powders

Cited by 117 publications

References 37 publications

Explosive shock processing of Pr₂Fe₁₄B/α–Fe exchange-coupled nanocomposite bulk magnets

Explosive shock processing of Pr₂Fe₁₄B/α–Fe exchange-coupled nanocomposite bulk magnets

Low-voltage electromagnetic compaction of metal and ceramic powders

Fabrication of tungsten-copper composites by hot-shock consolidation

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Dynamic consolidation of metal powders

Cited by 117 publications

References 37 publications

Explosive shock processing of Pr2Fe14B/α–Fe exchange-coupled nanocomposite bulk magnets

Explosive shock processing of Pr2Fe14B/α–Fe exchange-coupled nanocomposite bulk magnets

Low-voltage electromagnetic compaction of metal and ceramic powders

Fabrication of tungsten-copper composites by hot-shock consolidation

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Product

Resources

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Explosive shock processing of Pr₂Fe₁₄B/α–Fe exchange-coupled nanocomposite bulk magnets

Explosive shock processing of Pr₂Fe₁₄B/α–Fe exchange-coupled nanocomposite bulk magnets