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Microstructural and superplastic cha...

Charit, Indrajit.

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Microstructural and superplastic characteristics of friction stir processed aluminum alloys.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Microstructural and superplastic characteristics of friction stir processed aluminum alloys./
作者:	Charit, Indrajit.
面頁冊數:	143 p.
附註:	Source: Dissertation Abstracts International, Volume: 65-03, Section: B, page: 1523.
Contained By:	Dissertation Abstracts International65-03B.
標題:	Engineering, Materials Science. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3126838

Microstructural and superplastic characteristics of friction stir processed aluminum alloys.
Charit, Indrajit.

Microstructural and superplastic characteristics of friction stir processed aluminum alloys. - 143 p.

Source: Dissertation Abstracts International, Volume: 65-03, Section: B, page: 1523.

Thesis (Ph.D.)--University of Missouri - Rolla, 2004.

Friction stir processing (FSP) is an adapted version of friction stir welding (FSW), which was invented at The Welding Institute (TWI), 1991. It is a promising solid state processing tool for microstructural modification at localized scale. Dynamic recrystallization occurs during FSP resulting in fine grained microstructure. The main goal of this research was to establish microstructure/superplasticity relationships in FSP aluminum alloys.Subjects--Topical Terms:

1017759
Engineering, Materials Science.

Microstructural and superplastic characteristics of friction stir processed aluminum alloys.
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100 1 $a Charit, Indrajit. $3 1948724
245 1 0 $a Microstructural and superplastic characteristics of friction stir processed aluminum alloys.
300 $a 143 p.
500 $a Source: Dissertation Abstracts International, Volume: 65-03, Section: B, page: 1523.
500 $a Adviser: Rajiv S. Mishra.
502 $a Thesis (Ph.D.)--University of Missouri - Rolla, 2004.
520 $a Friction stir processing (FSP) is an adapted version of friction stir welding (FSW), which was invented at The Welding Institute (TWI), 1991. It is a promising solid state processing tool for microstructural modification at localized scale. Dynamic recrystallization occurs during FSP resulting in fine grained microstructure. The main goal of this research was to establish microstructure/superplasticity relationships in FSP aluminum alloys.
520 $a Different aluminum alloys (5083 Al, 2024 Al, and Al-8.9Zn-2.6Mg-0.09Sc) were friction stir processed for investigating the effect of alloy chemistry on resulting superplasticity. Tool rotation rate and traverse speeds were controlled as the prime FSP parameters to produce different microstructures. In another study, lap joints of 7475 Al plates were also studied to explore the possibility of developing FSW/superplastic forming route. Microstructures were evaluated using optical, scanning and transmission electron microscopy, orientation imaging microscopy and differential scanning calorimetry. Mechanical properties were evaluated using tensile testing.
520 $a FSP 2024 Al (3.9 mum grain size) exhibited an optimum ductility of 525% at a strain rate of 10-2 s-1 and 430°C. Grain boundary sliding mechanism was found to be the dominant mode of deformation in this alloy. In 5083 Al alloy, it was found that changing the process parameters, grain sizes in the range of 3.5--8.5 mum grain size could be obtained. Material processed with colder processing parameters showed a decrease in ductility due to microstructural instability, and followed solute drag dislocation glide mechanism. On the other hand, materials processed with hotter parameter combinations showed mode of deformation related to grain boundary sliding mechanism. FSP of as-cast Al-Zn-Mg-Sc alloy resulted in ultrafine grains (0.68 mum) with attractive combination of high strain rate and low temperature superplasticity. This also demonstrated that superplastic microstructures could be obtained directly from as-cast alloys via a single step of FSP.
520 $a All these showed that FSP has the potential of becoming an important grain refinement technique for producing fine grained aluminum alloys with superplastic properties. Microstructural instability of FSP aluminum alloys at higher temperatures can be limited or eliminated with proper control of process parameters and improved alloy design.
590 $a School code: 0135.
650 4 $a Engineering, Materials Science. $3 1017759
650 4 $a Engineering, Metallurgy. $3 1023648
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710 2 0 $a University of Missouri - Rolla. $3 1025712
773 0 $t Dissertation Abstracts International $g 65-03B.
790 1 0 $a Mishra, Rajiv S., $e advisor
790 $a 0135
791 $a Ph.D.
792 $a 2004
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3126838