Evaluation of ultrasonic attenuation and estimation of ultrasonic grain noise in copper

Stepinski, Tadeusz; Wu, Peng

doi:10.1063/1.1303084

Cited by 2 publications

(1 citation statement)

References 6 publications

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“…Contrarily, if the part is a built-in horizontal direction, the ultrasonic influence will be more uniform and is expected to have a more regular distribution. The evaluation of ultrasonic attenuation in polycrystalline metals occurring mostly because of scattering from grains was conducted by T. Stepinski and P. Wu [66] for the pure copper specimens. A frequency-dependent attenuation coefficient ζ(f) was determined by the spectral shift method (based on the measurement of a signal reflected from the front and backs surfaces of the metal plate) using the following equation:…”

Section: Ultrasonic-assisted Ded Processmentioning

confidence: 99%

Perspective Chapter: Direct Energy Deposition of Cu-Fe System Functionally Graded Materials – Miscibility Aspects, Cracking Sources, and Methods of Assisted Manufacturing

Makarenko¹,

Dubinin²,

Shishkovsky³

2022

Advanced Additive Manufacturing

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Direct energy deposition is a reliable additive manufacturing method of producing components with highly sophisticated geometry from a single material or combination of different materials with high manufacturing freedom and efficiency. The assembly operations are not required after the direct energy deposition: such complex parts as a rocket combustion chamber, a nuclear reactor element, a heat exchanger, and so on, could be fabricated layer-by-layer during one technological step. Promising applications are associated with Cu-Fe system laser deposited functionally graded components, which allow combining good oxidation resistivity, antifrictionality, thermal, and electrical conductivity of copper with mechanical strength, processability, and corrosion resistance of stainless steel. The main issue, which appears in the case of laser deposition of such materials, is internal stresses caused by significant inequality of physical properties of copper/bronze and steel, their limited miscibility, forming of brittle phases at the interface, and complexity of variation of mechanical and physical properties of the resulted alloy. The mentioned factors could cause various cracking in resulted parts. Specific techniques such as ultrasonic assistance, implementation of the external magnetic field, and post-treatment (hot isostatic pressing, machining), could be suggested to improve the quality of laser deposited Cu-Fe system functionally graded materials.

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Section: Ultrasonic-assisted Ded Processmentioning

confidence: 99%

Perspective Chapter: Direct Energy Deposition of Cu-Fe System Functionally Graded Materials – Miscibility Aspects, Cracking Sources, and Methods of Assisted Manufacturing

Makarenko¹,

Dubinin²,

Shishkovsky³

2022

Advanced Additive Manufacturing

View full text Add to dashboard Cite

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On the Nature of Low‐Mass Companions to Solar‐like Stars

Heacox

1999

ApJ

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Low-mass companions (mass \70 Jupiter masses) to solar-like stars are compared statistically to stellar-mass secondaries in binaries of similar primary spectral types and orbital scales, based largely on the survey of Duquennoy & Mayor. To within the limits imposed by observational constraints, the orbital properties of these low-mass companions (LMCs) are statistically indistinguishable from those of binary systems. In both populations, orbital periods (P), semimajor axes (a), angular momenta (L ), and binding energies (U) are all distributed approximately as f (x) P x~1 for x \ P, a, L , U. In both populations, eccentricities are broadly distributed approximately as f (e) P e~0.5, with no signiÐcant correlation with other orbital elements, apart from a marked circularization of close orbits. The distribution of LMC masses is approximately a power law with index between [1 and [2 ; there is ambiguous evidence in the data for a mass spectrum bimodality about approximately 10 Jupiter masses. In both populations the joint distributions of mass with all orbital properties are largely scattergrams, with no statistically signiÐcant correlations. The overall statistical properties of LMCs are suggestive of a common formation mechanism with binary star systems. The similar form of the distributions of all orbital dynamic quantities in both populations may result from postformation dissipative orbital decay.

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Evaluation of ultrasonic attenuation and estimation of ultrasonic grain noise in copper

Cited by 2 publications

References 6 publications

Perspective Chapter: Direct Energy Deposition of Cu-Fe System Functionally Graded Materials – Miscibility Aspects, Cracking Sources, and Methods of Assisted Manufacturing

Perspective Chapter: Direct Energy Deposition of Cu-Fe System Functionally Graded Materials – Miscibility Aspects, Cracking Sources, and Methods of Assisted Manufacturing

On the Nature of Low‐Mass Companions to Solar‐like Stars

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