35 KB630 KB21 KB200020242007Jeulin, DominiqueMoulin, NicolasParra-Denis, Estelleletnik:26številka:38 stranistr. 157-164ISSN:1580-3139COBISSID:24109785URN:URN:NBN:SI:doc-LVXVKJW5enDruštvo za stereologijo in kvantitativno analizo slike, Medicinska fakultetaImage analysis and stereology3D slikeAlloysAluminijAluminumData Interpretation, StatisticalDelec, velikostImage Processing, Computer-AssistedmikrostrukturaParticle SizePodatki, interpretacija statističnaSlika, obdelava z računalnikomstatistična analizaZlitineThree dimensional complex shapes analysis from 3D local curvature measurements| application to intermetallic particles in aluminium alloy 5xxx|The studied material is a 5xxx aluminium alloys containing 2 types of intermetallic particles : Alx(Fe;Mn) and Mg2Si. It is usually used in car industry as reinforcement pieces or in packaging industry, such as bottle liquid box lid. Scanning electronic microscope coupled with EDX analysis showscomplex shapes of intermetallic particles. The particle shape is obtainedduring the solidification of alloys. Particles fill vacant spaces between aluminium grains. Therefore final sheet properties depend on intermetallic particles shapes and notably on the matrix-particle interface properties. The goal of the present study is to classify intermetallic particles versus their shapes using local curvature information. The aluminiumalloys sample is observed by X ray micro tomography performed at the ESRF. Three dimensional images are segmented, and intermetallic particles are identified in a data base. Each particle is stored as a set of voxels. The surface of each particle is meshed by a marching cubes triangular meshing withthe software Amira©. A simplification of the surface is performed by an algorithm contracting the edges. Finally, principal curvatures: kmin and kmax are estimated by Amira© on each facet centre of the mesh. From the full intermetallic population, the bivariate distribution of kmin and kmax is estimated. The obtained graph kmin !kmax shows geometrical properties of interface portions of the surface of particles. A factorial correspondence analysis is performed to summarize the information on all intermetallic particles. In the obtained subspace, particles are classified into five shape families, in relation with their interface geometrical propertiesTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaDruštvo za stereologijo in kvantitativno analizo slike