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Microstructures and Mechanical Properties of Equal Channel Angular Pressed 5083 Al Alloy

Title
Microstructures and Mechanical Properties of Equal Channel Angular Pressed 5083 Al Alloy
Author
신동혁
Keywords
equal channel angular pressing; ultra-fine grain structure; 5083 aluminum alloy; microhardness; tensile properties; low temperature superplasticity
Issue Date
2001-06
Publisher
JAPAN INST METALS & MATERIALS
Citation
MATERIALS TRANSACTIONS, v. 42, issue. 6, page. 1074-1080
Abstract
An ultra-fine grained (UFG) structure was introduced in a commercial 5083 Al alloy with an initial grain size of ∼ 200 \\micron using the equal channel angular pressing (ECAP) technique. ECAP was successfully conducted at 473 K on the same sample up to a total of 8 pressings through the die such that the sample was rotated 180° around its longitudinal axis between pressings. The microstructure was reasonably homogeneous after a single pressing and consisted of parallel bands of elongated substructure having an average width of 0.2 \\micron and an average length of 0.8 \\micron. An equiaxed ultra-fine grained structure of ∼ 0.3 \\micron was obtained in the present alloy after 4 pressings. The ultra-fine grains were thermally stable at 523 K . The yield stress of as-received 5083 Al alloy was 129 MPa, whereas it increased to 249 MPa after a single pressing and finally became 290 MPa after 8 pressings, which was superior to that of a conventional 5083-H321 Al alloy. In addition, in this study, the feasibility of low temperature superplasticity of a UFG 5083 Al alloy was examined. It was found that the 5083 Al alloy with a grain size of ∼ 0.3 \\micron exhibited a superplastic-like behavior with elongation to failure in excess of 200% below 523 K.
URI
https://www.jstage.jst.go.jp/article/matertrans/42/6/42_6_1074/_article/-char/enhttps://repository.hanyang.ac.kr/handle/20.500.11754/158357
ISSN
1347-5320; 1345-9678
DOI
10.2320/matertrans.42.1074
Appears in Collections:
COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MATERIALS SCIENCE AND CHEMICAL ENGINEERING(재료화학공학과) > Articles
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