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3 Archives of Metallurgy and Materials

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The Investigation of Ground Granulated Blast Furnace Slag Geopolymer at High Temperature by Using Electron Backscatter Diffraction Analysis

100%

Aziz I. H. , Al Bakri Abdullah M. M. , Salleh M. A. A. M. , Yoriya S. , Razak R. A. , Mohamed R. , Baltatu M. S.

tom Vol. 67, iss. 1

227--231

This paper elucidated the potential of electron backscatter diffraction analysis for ground granulated blast furnace slag geopolymers at 1000°C heating temperature. The specimen was prepared through the mechanical ground with sandpaper and diamond pad before polished with diamond suspension. By using advanced technique electron backscatter diffraction, the microstructure analysis and elemental distribution were mapped. The details on the crystalline minerals, including gehlenite, mayenite, tobermorite and calcite were easily traced. Moreover, the experimental Kikuchi diffraction patterns were utilized to generate a self-consistent reference for the electron backscatter diffraction pattern matching. From the electron backscatter diffraction, the locally varying crystal orientation in slag geopolymers sample of monoclinic crystal observed in hedenbergite, orthorhombic crystal in tobermorite and hexagonal crystal in calcite at 1000°C heating temperature.

Microstructure and Mechanical Properties of AA1050/ AA6061/AA1050 Multi-Layer Sheet Fabricated by Cold Roll Bonding Process

88%

Lee S.-H.

Archives of Metallurgy and Materials

2018

tom Vol. 63, iss. 3

1489--1492

A cold roll-bonding process was applied to fabricate an AA1050/AA6061/AA1050 multi-layer sheet. Three Al sheets in which an AA6061 sheet is inserted inside two AA1050 sheets of 2 mm thickness, 40 mm width and 300 mm length were stacked up after surface treatment, and the material was then reduced to a thickness of 1.0 mm by multi-pass cold rolling. The AA1050/AA6061/AA1050 laminate complex sheet fabricated by roll bonding was then hardened by a natural aging (T4) and an artificial aging (T6) treatments. The microstructures of the as-roll bonded and the age-hardened Al complex sheets were revealed by optical microscope and electron back scatter diffraction analysis, and the mechanical properties were investigated by tensile and hardness testing. The strength of the as-roll bonded complex sheet was found to increase by 2.6 times, compared to that value of the starting material. Both AA1050 and AA6061 showed a typical recrystallization structure in which the grains were equiaxed after heat treatment. However, the grain size was smaller in AA6061 than in AA1050.

Phases identification by means of EBSD method - new possibilities of materials researches

63%

Klimek L.

tom Vol. 53, iss. 1

151-155

The examples of EBSD analysis of selected phases in steel are presented in this paper. The carbon steel, Co-Cr-Mo alloy and steel after termochemical treatment were examined. The obtained results confirm that the EBSD method can be a valuable tool used for recessive analysis of phases which occure in alloys with giving particular attention to theirs polymorphism and non stechiometry. It allows examining samples both as metallographic cross-section and fracturing as well as samples after surface treatment.

W artykule przedstawiono przykładowe możliwości analizy składu fazowego materiałów. Badania wykonano na stopie Co-Cr-Mo, przełomie stali węglowej oraz stali po obróbce cieplnochemicznej. Z przytoczonych badań wynika, że dyfrakcja elektronów wstecznie rozproszonych może być cennym narzędziem służącym do precyzyjnej identyfikacji faz występujących w stopach z uwzględnienicm ich niestechiometryczności i polimorfizmu. Istnieje możliwość badan zarówno na zgładach nietalograficznych , powierzchniach po obróbkach cieplnochemicznych oraz przełomach.