Surface Position-Resolved Thermophysical Properties for Metallic Alloys

Kim, Y. W.

doi:10.1007/s10765-007-0171-5

Cited by 4 publications

(3 citation statements)

References 8 publications

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“…When repeated, we obtain the elemental composition measurement at increasing depth from the surface because each laser pulse removes a definite thickness of specimen matter. More detailed discussions of the calibration and the procedure for determination of elemental composition may be found elsewhere [1][2][3]5].…”

Section: Experimental Results and Analysismentioning

confidence: 99%

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Benard–Marangoni Instability as Possible Modifier of Surface Alloy Composition

Kim

2007

Int J Thermophys

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Thermophysical properties of amorphous alloys represent the features of a given material specimen, and, as such, they are dependent, in general, on their elemental composition. Some properties are measured at surfaces, and others are measured for the bulk as a whole. Complications arise when the elemental composition varies as a function of position within the material specimen, as demonstrated by simultaneous measurements of thermal diffusivity and elemental composition by time-resolved spectroscopy of laserproduced plasma (LPP) plume emissions. To further understand the source of a rather common near-surface elemental composition anomaly, the evolution of the surface composition of Wood's alloy under the influence of thermal cycling with, and without, a temperature gradient over the specimen has been investigated. Surface composition modifications have been found to take place by accumulation of irregularly spaced gray patches of an inhomogeneous composition on the surface in the presence of a temperature gradient. Determination of elemental composition by LPP spectroscopy shows the three-dimensional structure of the patches.

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Section: Experimental Results and Analysismentioning

confidence: 99%

“…The translation capability is thus used only to explore different surface areas of interest on a given specimen. More details of the experimental setup may be found in an accompanying article [5].…”

Section: Methodsmentioning

confidence: 99%

Benard–Marangoni Instability as Possible Modifier of Surface Alloy Composition

Kim

2007

Int J Thermophys

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“…These zones are examined by the method of LPP plume spectroscopy. Position-resolved analysis of LPP plume emissions following a single laser-pulse excitation with a spatially extended footprint [2] can provide a set of measurements of both the thermal diffusivity and elemental composition at multiple temperatures within a microsecond.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Multitemperature Measurements of Thermal Diffusivity and Composition

Kim

2009

Int J Thermophys

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It has been well established that thermal forcing of disordered multielement metallic alloys results in permanent modification of their thermal transport properties. The mechanism depends on the detail of heating and its duration, and entails rearrangement of the spatial distribution of constituent atoms within the material proper. It presents a serious complication in developing a body of properties data as a function of temperature because establishment of a thermal state for a specimen is often cast into question. A new general technique is presented for simultaneous multiple-temperature measurements of thermal diffusivity and local composition for a single specimen. The specimen is heated steeply into a state of temperature nonuniformity. The measurement is carried out by time-resolved spectroscopy of single-shot laser-produced plasma (LPP) plume emissions; analysis is made of the emissions as a function of position within the laser focal area. The procedure for analysis is presented together with the results for 80 mass% Ni-20 mass% Cr Nichrome specimens.

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Mini-Conference on the First Microns of the First Wall

Stotler¹,

Rognlien²,

Krasheninnikov³

2008

Physics of Plasmas

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Interactions between plasmas and their surrounding materials (plasma facing components) are with the survivability of these materials, as well as the impact of these interactions back on the plasma. These interactions begin on the surface, but can have consequences a few microns into the material.This mini-conference on these "first microns" was designed to bring to the Division of Plasma Physics Meeting experts on these topics who would otherwise not attend. At the same time, the mini-conference was intended to expose the broader fusion community to these issues.The mini-conference covered in three, half-day sessions the topics of lithium coatings and surfaces, mixed materials characteristics, and issues associated with graphite.

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Surface Position-Resolved Thermophysical Properties for Metallic Alloys

Cited by 4 publications

References 8 publications

Benard–Marangoni Instability as Possible Modifier of Surface Alloy Composition

Benard–Marangoni Instability as Possible Modifier of Surface Alloy Composition

Simultaneous Multitemperature Measurements of Thermal Diffusivity and Composition

Mini-Conference on the First Microns of the First Wall

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