Crystallographic Texture Evolution of a Zinc Sheet Subjected to Different Strain Paths
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TRODUCTION
ZINC sheets are characterized for having great surface aspect and for being malleable and recyclable. Zinc is also naturally resistant to corrosion, durable, and does not require costly maintenance. These qualities make zinc sheets suitable for a large variety of uses in the architectural industry. It can be seen in roofs, facades, rainwater systems, and multiple other uses, in particular where climatic conditions are severe. Zinc sheets are produced by continuous casting followed by rolling until the final thickness. A distinctive characteristic of rolled HCP materials is the development of typical crystallographic textures. The various possible typical textures are determined by the c/a lattice relation of the material, compared to the ideal value of 1.633.[1] In the case of zinc, its c/a relation is 1.856, which results in a rolling texture characterized by concentration of the basal poles in the plane normal to the transverse direction. The most densely packed directions in zinc crystals are the h1120i directions, which are contained in the basal {0002}, prismatic 10 10 , and pyramidal 1011 planes. The most active slip system at room temperature is the basal system, formed by dislocations gliding in the h1120i directions
FERNANDO SCHLOSSER and CLAUDIO SCHWINDT are with the Department of Engineering, UNS-CONICET, Av. Alem 1253, Bahı´ a Blanca (B8000CPB), Buenos Aires, Argentina. VALERIA FUSTER and JAVIER WALTER SIGNORELLI are with the IFIRUNR-CONICET, Bv. 27 de Febrero 210b, Rosario (S2000BTP), Santa Fe, Argentina. Contact e-mail: signorelli@ifir-conicet.gov.ar ANDREA TOMMASI is with the Ge´osciences Montpellier - CNRS and Universite´ de Montpellier, Place Eugene Bataillon, Montpellier, France. Manuscript submitted December 14, 2016. METALLURGICAL AND MATERIALS TRANSACTIONS A
on the {0002} planes. The second most active slip system by glide in the h1123i is the pyramidal p2, formed directions on the 1122 planes.[2,3] The combined effect of crystallographic texture, crystalline structure, and microstructure results in a very strong mechanical anisotropy.[4] Recently, Schwindt et al.[5] used a viscoplastic self-consistent scheme to reproduce the anisotropy on the stress–strain curves of a Zn20 sheet, showing that texture evolution plays an important role on both mechanical anisotropy and formability. Previous studies focused on the analysis of crystallographic texture evolution of zinc sheets during rolling. Philippe et al.[6] studied the texture evolution of a zinc-copper-titanium sheet after cold rolling, and found the presence of two components usually reported in the literature,[7,8] and two other components not mentioned before. Diot et al.[9] observed a through-thickness texture gradient after cold rolling of a zinc-copper-titanium sheet as a consequence of shear stress and friction on the surface. Later, Diot et al.[10] observed that the heterogeneity in distribution of aluminum in zinc-copper-titanium sheets strengthens the through-thickness texture gradient produced by rolling. Zhan
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