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The rheological behavior of semi-sol...

Lashkari, Omid.

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The rheological behavior of semi-solid A356 alloy.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	The rheological behavior of semi-solid A356 alloy./
作者:	Lashkari, Omid.
面頁冊數:	188 p.
附註:	Source: Dissertation Abstracts International, Volume: 67-08, Section: B, page: 4646.
Contained By:	Dissertation Abstracts International67-08B.
標題:	Engineering, Metallurgy. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=NR17922
ISBN:	9780494179222

The rheological behavior of semi-solid A356 alloy.
Lashkari, Omid.

The rheological behavior of semi-solid A356 alloy. - 188 p.

Source: Dissertation Abstracts International, Volume: 67-08, Section: B, page: 4646.

Thesis (Ph.D.)--Universite du Quebec a Chicoutimi (Canada), 2006.

The semi-solid-metal, SSM, processing deals with semi solid slurries, in which non dendritic solid particles are dispersed in a liquid matrix with apparent viscosity values near to that of liquid. It is able to flow easily under pressure and fills complicated die cavities to manufacture sound as-cast products with high integrity. The SSM slurry is prepared through different methods. In the current study conventional casting and the SEED process were employed to produce SSM billets with different morphologies of primary alpha-Al phase in A356 Al-Si alloy. For conventional casting, a range of solid particle morphologies, microstructure, were realized through variation of pouring temperature while for the SEED billets, as a new patent of ALCAN international for semi solid casting, changes in the morphology were achieved by control of process parameters during solidification of the melt.

ISBN: 9780494179222Subjects--Topical Terms:

1023648
Engineering, Metallurgy.

The rheological behavior of semi-solid A356 alloy.
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245 1 4 $a The rheological behavior of semi-solid A356 alloy.
300 $a 188 p.
500 $a Source: Dissertation Abstracts International, Volume: 67-08, Section: B, page: 4646.
502 $a Thesis (Ph.D.)--Universite du Quebec a Chicoutimi (Canada), 2006.
520 $a The semi-solid-metal, SSM, processing deals with semi solid slurries, in which non dendritic solid particles are dispersed in a liquid matrix with apparent viscosity values near to that of liquid. It is able to flow easily under pressure and fills complicated die cavities to manufacture sound as-cast products with high integrity. The SSM slurry is prepared through different methods. In the current study conventional casting and the SEED process were employed to produce SSM billets with different morphologies of primary alpha-Al phase in A356 Al-Si alloy. For conventional casting, a range of solid particle morphologies, microstructure, were realized through variation of pouring temperature while for the SEED billets, as a new patent of ALCAN international for semi solid casting, changes in the morphology were achieved by control of process parameters during solidification of the melt.
520 $a In order to investigate the morphological evolution due to the effect of different process parameters, pouring temperature and swirling intensities, the SSM billets prepared by both methods were studied using quantitative metallography. The microstructure of SSM A356 alloy has also been characterized using an innovative method, parallel plate compression viscometry, where a correlation was made between the morphology and viscosity. The main objective of the current research was the implication of rheological principles to study the deformation behavior of A356 alloy at different morphologies and fraction of solid, while treating the SSM billets as Newtonian and Non-Newtonian fluids respectively. Furthermore, two empirical relationships were proposed to underline the correlation among the viscosity, and fraction solid and its morphology. In order to further confirm the reliability of the tests results in this research and to highlight that the sample size has no effect on the final deformation and viscosity values, a new series of tests were performed using two sets of specimens with aspect ratio (height/diameter) of 0.4 and 1.8.
520 $a It was found that conventional billets cast at low pouring temperature of 615°C comprise fine and equiaxed grains while the billets cast at high pouring temperature of 695°C have dendritic structure. For SEED billets, swirling refined the primary alpha-Al dendrites and promoted the formation of rosette and/or globular alpha-Al particles with increasing swirling speed. The effectiveness of swirling speed may be due to reduction in segregation of alloying elements at the solidification front and better heat transfer between the mold and bulk of liquid to establish a shallow temperature gradient resulting in refining and formation of equiaxed as-cast structure. There was no evidence of entrapped eutectic within the primary alpha-Al particles as one of the advantages of SEED slurry-on-demand technology. (Abstract shortened by UMI.)
590 $a School code: 0862.
650 4 $a Engineering, Metallurgy. $3 1023648
650 4 $a Engineering, Materials Science. $3 1017759
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710 2 0 $a Universite du Quebec a Chicoutimi (Canada). $3 1032071
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