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Etude des modifications de composition d'alliages de zinc cuivre titane : conséquences sur l'aptitude au formage

Abstract : aZinc alloys with copper and titanium additions are widely used in the shape of rolled sheets for part of roofing. After building, under bad weather conditions, when the temperature decreases, microcracks nucleate at the sheet surface. These microcracks can be quantified by a bendability test at low temperature. In order to remedy this industrial problem, previous studies in which the manufacuring process and the laboratory alloy compositions were modified have been carried out. It appears that some chemical additions improve the bendability of these alloys. It was therefore necessary to see whether this could apply under industrial conditions. The manufacturing process used for the alloys here studied is the same as the industrial process widely used. A large scale of copper and titanium concentrations is chosen with other chemical element additions. However, these components have not been located into the alloys. Thanks to surface analysis (glow discharge optical emission spectrometry and secondary ion mass spectroscopy), the chemical element edging was determined within the microstructure. The oxidation states of elements have been shown owing to electron spectroscopy for chemical analysis. Texture gradient in the sheets were experimentally characterised by X-rays investigations and modelled using friction and/or shear strain components. The mechanical behaviour of the sheets was monitored by bending and tensile tests. A statistical approach using principal component analysis was developed to determine the influence of variations in alloying element concentrations on the different properties of the material
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Submitted on : Tuesday, April 24, 2018 - 4:11:50 PM
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Michèle Diot. Etude des modifications de composition d'alliages de zinc cuivre titane : conséquences sur l'aptitude au formage. Sciences de l'ingénieur [physics]. Université Paul Verlaine - Metz, 1996. Français. ⟨NNT : 1996METZ013S⟩. ⟨tel-01777120⟩



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