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Coarsening in Solid Liquid Systems: ...

Thompson, John D.

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Coarsening in Solid Liquid Systems: A Verification of Fundamental Theory.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Coarsening in Solid Liquid Systems: A Verification of Fundamental Theory./
作者:	Thompson, John D.
面頁冊數:	172 p.
附註:	Source: Dissertation Abstracts International, Volume: 76-08(E), Section: B.
Contained By:	Dissertation Abstracts International76-08B(E).
標題:	Materials science. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3686628
ISBN:	9781321634358

Coarsening in Solid Liquid Systems: A Verification of Fundamental Theory.
Thompson, John D.

Coarsening in Solid Liquid Systems: A Verification of Fundamental Theory. - 172 p.

Source: Dissertation Abstracts International, Volume: 76-08(E), Section: B.

Thesis (Ph.D.)--Northwestern University, 2015.

Coarsening is a process that occurs in nearly all multi-phase materials in which the total energy of a system is reduced through the reduction of total interfacial energy. The theoretical description of this process is of central importance to materials design, yet remains controversial. In order to directly compare experiment to theoretical predictions, low solid volume fraction PbSn alloys were coarsened in a microgravity environment aboard the International Space Station (ISS) as part of the Coarsening in Solid Liquid Mixtures (CSLM) project.

ISBN: 9781321634358Subjects--Topical Terms:

543314
Materials science.

Coarsening in Solid Liquid Systems: A Verification of Fundamental Theory.
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245 1 0 $a Coarsening in Solid Liquid Systems: A Verification of Fundamental Theory.
300 $a 172 p.
500 $a Source: Dissertation Abstracts International, Volume: 76-08(E), Section: B.
500 $a Adviser: Peter W. Voorhees.
502 $a Thesis (Ph.D.)--Northwestern University, 2015.
520 $a Coarsening is a process that occurs in nearly all multi-phase materials in which the total energy of a system is reduced through the reduction of total interfacial energy. The theoretical description of this process is of central importance to materials design, yet remains controversial. In order to directly compare experiment to theoretical predictions, low solid volume fraction PbSn alloys were coarsened in a microgravity environment aboard the International Space Station (ISS) as part of the Coarsening in Solid Liquid Mixtures (CSLM) project.
520 $a PbSn samples with solid volume fractions of 15%, 20% and 30% were characterized in 2D and 3D using mechanical serial sectioning. The systems were observed in the self-similar regime predicted by theory and the particle size and particle density obeyed the temporal power laws predicted by theory. However, the magnitudes of the rate constants governing those temporal laws as well as the forms of the particle size distributions were not described well by theoretical predictions. Additionally, in the 30% solid volume fraction system, the higher volume fraction results in a non-spherical particle shape and a more closely packed spatial distribution. The presence of slow particle motion induced by vibrations on the ISS is presented as an explanation for this discrepancy.
520 $a To model the effect of this particle motion, the Akaiwa-Voorhees multiparticle diffusion simulations are modified to treat coarsening in the presence of a small convection term, such as that of sedimentation, corresponding to low Peclet numbers. The simulations indicate that the particle size dependent velocity of the sedimentation increases the rate at which the system coarsens. This is due to the larger particles traveling farther than normal, resulting in them encountering more small particles, which favors their growth. Additionally, sedimentation resulted in broader PSDs with a peak located at the average particle size.
520 $a When the simulations are modified to account for the particle sedimentation, the measurements for the 15% and 20% system are in excellent agreement with the theoretical predictions for both the rate constants and the PSDs. There is good agreement with the 30% system as well, though the simulations are less valid at this volume fraction.
590 $a School code: 0163.
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793 $a English
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