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RISS 인기검색어
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- 저자 : Kristián Máthis (검색결과 2 건)
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In Situ Investigation of Deformation Mechanisms in Magnesium-Based Metal Matrix Composites
Gergely Farkas,최희만,Kristián Máthis,Zoltán Száraz,노윤숙,Zuzanka Trojanová,Peter Minárik 대한금속·재료학회 2015 METALS AND MATERIALS International Vol.21 No.4
We studied the effect of short fibers on the mechanical properties of a magnesium alloy. In particular, deformation mechanisms in a Mg-Al-Sr alloy reinforced with short alumina fibers were studied in situ using neutron diffraction and acoustic emission methods. The fibers’ plane orientation with respect to the loading axis was found to be a key parameter, which influences the acting deformation processes, such as twinning or dislocation slip. Furthermore, the twinning activity was much more significant in samples with parallel fiber plane orientation, which was confirmed by both acoustic emission and electron backscattering diffraction results. Neutron diffraction was also used to assist in analyzing the acoustic emission and electron backscattering diffraction results. The simultaneous application of the two in situ methods, neutron diffraction and acoustic emission, was found to be beneficial for obtaining complementary datasets about the twinning and dislocation slip in the magnesium alloys and composites used in this study.
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Park, Hyeji,Hong, Kicheol,Kang, Jin Soo,Um, Teakyung,Knapek, Michal,Miná,rik, Peter,Sung, Yung-Eun,Má,this, Kristiá,n,Yamamoto, Akiko,Kim, Hyun-Kyung,Choe, Heeman Elsevier 2019 Materials Science and Engineering C Vol.97 No.-
<P><B>Abstract</B></P> <P>We synthesized Fe foams using water suspensions of micrometric Fe<SUB>2</SUB>O<SUB>3</SUB> powder by reducing and sintering the sublimated Fe oxide green body to Fe under 5% H<SUB>2</SUB>/Ar gas. The resultant Fe foam showed aligned lamellar macropores replicating the ice dendrites. The compressive behavior and deformation mechanism of the synthesized Fe foam were studied using an acoustic emission (AE) method, with which we detected sudden localized structural changes in the Fe foam material. The evolution of the deformation mechanism was elucidated using the adaptive sequential <I>k</I>-means (ASK) algorithm; specifically, the plastic deformation of the cell struts was followed by localized cell collapse, which eventually led to fracturing of the cell walls. For potential biomedical applications, the corrosion and biocompatibility characteristics of the two synthesized Fe foams with different porosities (50% vs. 44%) were examined and compared. Despite its larger porosity, the superior corrosion behavior of the Fe foam with 50% porosity can be attributed to its larger pore size and smaller microscopic surface area. Based on the cytotoxicity tests for the extracts of the foams, the Fe foam with 44% porosity showed better cytocompatibility than that with 50% porosity.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Iron foam synthesized from water suspension of Fe<SUB>2</SUB>O<SUB>3</SUB> powder under 5% H<SUB>2</SUB>/Ar gas. </LI> <LI> Compressive deformation mechanism of iron foam is analyzed using an acoustic emission. </LI> <LI> Not porosity but pore size is a dominant factor for corrosion behavior of iron foams. </LI> <LI> Concentration released Fe<SUP>n+</SUP> controls cytotoxicity of iron foam extracts. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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