Pii: S1359-6454(96)00387-4
نویسنده
چکیده
The photothermal deflection technique is used to measure the thermal diffusivity of a metal+eramic composite. The present, as well as other data on composites are analyzed to estimate a value for the Kapitza radius, rk, which represents the effectivevalue of the thermal boundary resistance of heterointerfaces. Remarkably, the data from different metal+eramic composite materials lead to a similar value (within a factor of about two), rk% 1pm. Possiblereasons for this outcome are discussed in terms of the acoustic mismatch model for thermal boundary resistance. Analysis of the data also suggestspossible anomalous effects in nanostructured materials. Q 1997Acta Metahrgica Inc.
منابع مشابه
Pii: S1359-6454(96)00395-3
Debonding of films attached to substrates as well as fibers embedded in matrices typically involves initiation, steady-state propagation and a final transient as the debond converges on an edge or another debond. The emphasis in this paper is on the mechanics of the transient. Under most circumstances, a converging debond crack is characterized by an energy release rate that approaches zero, ca...
متن کاملPii: S1359-6454(99)00264-5
ÐThe grain boundary segregation of Bi in dilute polycrystalline Cu±Bi alloys was systematically studied as a function of temperature and composition. The temperature dependencies of the Gibbsian excess of Bi at the grain boundaries exhibited discontinuous changes at the temperatures close to, but dierent from the bulk solidus temperatures. The observed segregational phase transition was interp...
متن کاملPii: S1359-6454(96)00283-2
The morphology and microstructure of metallic thin films synthesized by physical vapor deposition are known to be sensitive functions of the incident flux, its angular distribution and kinetic energy as well as the substrate temperature. Using an embedded atom method to represent the interatomic interactions, two-dimensional molecular dynamics simulations have been conducted to identify the rol...
متن کاملPii: S1359-6454(99)00156-1
ÐThe eect of hydrogen in solid solution on the edge/screw character of dislocations has been investigated by deforming samples of high-purity aluminum in a gaseous hydrogen environment in situ in a controlled environment transmission electron microscope. Solute hydrogen was found to stabilize edge segments of dislocations, which inhibited, and in some cases stopped dislocations from cross-slip...
متن کاملPii: S1359-6454(99)00023-3
ÐThe durability of residually compressed coatings, particularly thermal barrier coatings (TBCs), is governed by events occurring at the interface with the substrate. In general, failure involves the sequential nucleation growth and coalescence of separations in the presence of imperfections and defects. The growth and coalescence phases are analyzed. Remnant ligaments are expected from the mech...
متن کامل