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Evaluation of the characteristics of...

Xu, Cheng.

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Evaluation of the characteristics of ultrafine-grained aluminum alloys obtained by equal-channel angular pressing.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Evaluation of the characteristics of ultrafine-grained aluminum alloys obtained by equal-channel angular pressing./
Author:	Xu, Cheng.
Description:	185 p.
Notes:	Source: Dissertation Abstracts International, Volume: 64-09, Section: B, page: 4572.
Contained By:	Dissertation Abstracts International64-09B.
Subject:	Engineering, Materials Science. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3103981

Evaluation of the characteristics of ultrafine-grained aluminum alloys obtained by equal-channel angular pressing.
Xu, Cheng.

Evaluation of the characteristics of ultrafine-grained aluminum alloys obtained by equal-channel angular pressing. - 185 p.

Source: Dissertation Abstracts International, Volume: 64-09, Section: B, page: 4572.

Thesis (Ph.D.)--University of Southern California, 2003.

Equal-Channel Angular Pressing (ECAP) is capable of producing bulk samples of ultrafine-grained materials and thus achieving advanced properties. The method is very attractive because of its potential for scaling-up in industrial applications. Investigations were carried out in this work to evaluate the characterizations by ECAP of some aluminum alloys that of importance in industry.Subjects--Topical Terms:

1017759
Engineering, Materials Science.

Evaluation of the characteristics of ultrafine-grained aluminum alloys obtained by equal-channel angular pressing.
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035 $a (UnM)AAI3103981
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100 1 $a Xu, Cheng. $3 1948645
245 1 0 $a Evaluation of the characteristics of ultrafine-grained aluminum alloys obtained by equal-channel angular pressing.
300 $a 185 p.
500 $a Source: Dissertation Abstracts International, Volume: 64-09, Section: B, page: 4572.
500 $a Adviser: Terence G. Langdon.
502 $a Thesis (Ph.D.)--University of Southern California, 2003.
520 $a Equal-Channel Angular Pressing (ECAP) is capable of producing bulk samples of ultrafine-grained materials and thus achieving advanced properties. The method is very attractive because of its potential for scaling-up in industrial applications. Investigations were carried out in this work to evaluate the characterizations by ECAP of some aluminum alloys that of importance in industry.
520 $a Homogeneity of the samples by ECAP was inspected by investigating distribution profiles of microhardness over the cross-sectional plane of the samples of pure Al and an Al-6061 alloy by ECAP. The results show that homogeneity develops with increasing number of pressings and a homogeneous distribution of microhardness is achieved over the cross-sectional plane after 8 passes of ECAP via route BC. Route BC is also revealed to be the most preferred processing route to achieve a homogeneous microstructure during ECAP.
520 $a Cavity examination was conducted on aluminum alloys and the results show that no cavities were developed during ECAP but evidence of cavitation was found in subsequent tensile testing at elevated temperatures. The cavities have sizes comparable to the grain sizes, elliptical shapes and preferential orientations along the tensile axis. The cavitation exhibits the characteristics of high cavity density and small cavity sizes at optimum strain rates where maximum elongations are attained.
520 $a The potential for achieving high strain-rate superplasticity through ECAP was also investigated using a commercial spray-cast Al-7034 alloy with a composition of 11.5% Zn, 3% Mg, 2.5% Cu and 0.2% Zr and a cast Al-9.8Zn-3Mg-0.4Sc alloy. The two alloys exhibited grain sizes of &sim;0.3 and &sim;0.5 mum after 6 passes of ECAP at 473 K, respectively, and achieved enhanced ductility at elevated temperatures. The Al-7034 alloy achieved elongations of &sim;1100% at high strain rates of 1.0 x 10-2 and 3.3 x 10-2 s-1 at 673 K after 6 and 8 passes of ECAP at 473 K via route BC, respectively, thereby showing it is possible to achieve high strain-rate superplasticity after ECAP.
590 $a School code: 0208.
650 4 $a Engineering, Materials Science. $3 1017759
690 $a 0794
710 2 0 $a University of Southern California. $3 700129
773 0 $t Dissertation Abstracts International $g 64-09B.
790 1 0 $a Langdon, Terence G., $e advisor
790 $a 0208
791 $a Ph.D.
792 $a 2003
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3103981