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Journal ArticleDOI

Elevated temperature tensile flow and fracture behaviour of a recently developed Canadian Al-Mg-Mn alloy

01 Jan 1995-Journal of Materials Science Letters (Kluwer Academic Publishers)-Vol. 14, Iss: 12, pp 881-884
About: This article is published in Journal of Materials Science Letters.The article was published on 1995-01-01. It has received 2 citation(s) till now. The article focuses on the topic(s): Tensile testing & Superplasticity.
Topics: Tensile testing (54%), Superplasticity (53%)
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Journal ArticleDOI
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.

60 citations

01 Jun 2004-

20 citations

Cites background from "Elevated temperature tensile flow a..."

  • ...Zr Zirkonium Durch Zusätze des kornfeinenden Elementes Zirkonium in AlMgMn-Legierungen kann das feinkörnige Mikrogefüge stabilisiert und so bei höheren Temperaturen die Tendenz zu Verformungsbrüchen erhöht werden [98] [112] [113]....


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Journal ArticleDOI
Abstract: A study of the fine-scale topography of tensile fractures in selected aluminum alloys was made to provide information on the influence of second-phase microconstituents on microvoid initiation, growth, and coalescence. The test materials included three commercial aluminum alloys and three high-purity Al-Cu binary alloys heat-treated to provide a wide range of precipitate morphology. The fracture surfaces of notched-tensile specimens were examined, and the fine-scale topographic features compared with microstructural parameters. The principal observations made were: 1) for a dual precipitate morphology, void initiation first occurs at the larger precipitates, 2) fracture may occur by growth and coalescence of voids initiated at only a small fraction of precipitate sites, 3) void initiation can occur independent of precipitate particles, and 4) intergranular fracture may occur by growth and coalescence of microvoids within the grain-boundary zone. These observations established that the detailed aspects of fracture by microvoid coalescence are intimately related to precipitate morphology, but no simple, uniform correlation of fracture surface topography with precipitate size and distribution was evident.

23 citations

Journal ArticleDOI
Abstract: The tensile flow behaviour in the range 275 to 550 ° C of an ultra-fine-grained superplastic Al-Ca-Zn alloy is reported. Under certain conditions of temperature and strain rate, superplastic ductility could be established. Fracture surfaces of tensile specimens tested in the above temperature range were examined by scanning electron microscopy and a correlation could be obtained between the ductility, as revealed by the tension tests, and the fracture behaviour. The fractographic studies also suggested a transition in the deformation process from grain deformation (mainly slip) at the lower temperatures to grain-boundary deformation (predominantly grain-boundary sliding) in the vicinity of 425 ° C.

14 citations

Journal ArticleDOI

11 citations

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