Mechanical Engineering / Makina Mühendisliği

Permanent URI for this collectionhttps://hdl.handle.net/11147/4129

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Subject: search.filters.subject.Energy dispersive spectroscopy

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  • Article
    Citation - WoS: 70
    Citation - Scopus: 84
    Mechanical Properties and Microstructural Evaluation of Aa5013 Aluminum Alloy Treated in the Semi-Solid State by Sima Process
    (Elsevier Ltd., 2004) Saklakoğlu, Nurşen; Tanoğlu, Metin; Tanoğlu, Metin; Öztaş, Özgü; Çubukcuoğlu, Önder; 03.10. Department of Mechanical Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
    The microstructure and mechanical properties of AA5013 aluminum alloys prepared by strain-induced melt activation (SIMA) process were studied to investigate the effects of cold working and heat treatment conditions. The specimens subjected to deformation ratios of 30 and 50% and various heat treatment time and temperature regimes were characterized in the present study. The results revealed that for the desired microstructure of the alloy, the optimum heat treatment temperature and time were 650°C and 60min, respectively, for both deformation ratios. However, the specimens with 50% cold working exhibited more brittle behavior while they contain finer grains with uniform distribution along the cross-sections as compared to 30% cold working.
  • Article
    Citation - WoS: 44
    Citation - Scopus: 44
    Ettringite Formation in Historic Bath Brick-Lime Plasters
    (Elsevier Ltd., 2003) Böke, Hasan; Akkurt, Sedat; Akkurt, Sedat; Böke, Hasan; 03.09. Department of Materials Science and Engineering; 02.01. Department of Conservation and Restoration of Cultural Heritage; 03. Faculty of Engineering; 01. Izmir Institute of Technology; 02. Faculty of Architecture
    Two types of historic hydraulic brick-lime plasters from a selected Ottoman bath are examined to characterize their technology and the appropriateness of their use in bath. The first type of plaster is original and structurally sound, while the historic repair plaster is the second type and is found to have deteriorated despite being exposed to the same environment. This difference is investigated by comparing their raw material compositions and the pozzolanic activities of the brick powders used in the plasters. Although these results showed no significant differences, ettringite crystals are detected in the historic repair ones by XRD, FTIR, and SEM-EDS analysis. The repair plaster may have lost its integrity owing to the expansion generated by the growth of ettringite crystals in the plaster. In this study, the ettringite formation is discussed in relation to hydration reaction products of lime-brick plasters, possible sources of gypsum, and the climatic conditions of historic bath building.