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  • 1
    Electronic Resource
    Electronic Resource
    Transformation-Toughened Ceramic Multilayers with Compositional Gradients (1998)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 81 (1998), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The processing and the thermomechanical characteristics of zirconia-toughened alumina (ZTA) ceramic multilayers, with through-thickness gradients in the concentrations of the tetragonal and monoclinic zirconia phases, are studied both theoretically and experimentally. Analytical solutions for the evolution of thermal strains, internal stresses, and the overall curvature changes in response to various temperatures were derived using known plate theory formulations. Compositionally graded multilayer stacks and complex shapes of ZTA ceramics were fabricated by three-dimensional printing (3DP). The relative fractions of the tetragonal to monoclinic ZrO2 phases were varied in a prescribed fashion. Phase transformation of ZrO2 in ZTA during cooling from the sintering temperature was controlled by doping different amounts of Y2O3 through the thickness of the ZTA multilayer plate. The local content of monoclinic ZrO2 through the thickness was characterized by X-ray diffraction analysis. The microstructure, some basic mechanical properties, and thermal expansion behavior of the 3DP ZTA system were also characterized. Thermally induced curvature of the ZTA multilayer plate was measured, and the experimental results were compared with the predictions based on the analytical solutions. Symmetric ZTA multilayers with surface compression were also prepared by 3DP and tested for flexural strength. Results showed a significant increase in strength from the monolithic specimens to the compositionally controlled ones. Results from the compression tests of notched ZTA blocks demonstrated the role of m-ZTA shield zones in enhancing the load-bearing characteristics. This study also demonstrated the possibility that commonly available computational tools can be used to design and construct complex shapes with compositional variation to enhance and control mechanical properties.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.1998.tb02291.x
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  • 2
    Electronic Resource
    Electronic Resource
    Mechanical and Fracture Behaviors of (Al〈sub〉2〈/sub〉O〈sub〉3〈/sub〉+SiC〈sub〉p〈/sub〉)/AZ91 Hybrid Mg Matrix Composite (2004)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 449-452 (Mar. 2004), p. 653-656 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Hybrid AZ91 Mg matrix composites reinforced with ceramic short fiber (Al〈sub〉2〈/sub〉O〈sub〉3〈/sub〉) and particle (Si or SiC〈sub〉p〈/sub〉) were fabricated by squeeze casting method. Microstructure of hybrid Mg matrix was examined and mechanical and fracture properties were characterized. It was found that squeeze casting is effective method for the fabrication of hybrid Mg matrix composites with fairly well distributed reinforcement and near defect-free solidification microstructure. Strength and wear resistance were enhanced with hybridization of reinforcements. To investigate fracture properties of hybrid Mg matrix composites, in-situ micro-fracture experiment was performed in SEM. Crack was initiated and propagated mainly by decohesion of interfaces between Mg matrix and reinforcements. Large ceramic particles tend to fracture and thus seem to be undesirable for mechanical and fracture behavior of hybrid Mg matrix composites
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/08/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.449-452.653.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of Cooling Rate on Mechanical and Electrical Properties of Cu-TiB〈sub〉2〈/sub〉 by Turbulent In-Situ Mixing Process (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 119 (Jan. 2007), p. 135-138 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: A copper matrix composite reinforced with in situ TiB2 nanoparticle was successfullyfabricated by tubulent in-situ mixing process. The microstructure, mechanical and electricalproperties of the in situ composite were investigated. The results showed that the in situ formed TiB2particles, in which size varying from about 50nm to 200nm, exhibited a homogenous dispersion in thecopper matrix. It is shown that the interface between the nanoscale particles and the matrix was cleanwithout a transitional layer. Because of the reinforcement, the hardness and Young’s Modulus of thecomposite improved with increment of cooling rate. Moreover, the in situ Cu-TiB2 compositeexhibited higher electrical conductivity with increasing of cooling rate
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/23/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.119.135.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Effect of Silver Additions on the Ageing Behavior and Mechanical Properties of Mg-Al-Si-Sn-Sr Alloy (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 124-126 (June 2007), p. 1469-1472 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: Mg is one of the most promising structural materials for lightweight applications due to itslow density, good castability and damping capacity. In this study, we investigated the effect of silver(Ag) addition on alloy ageing behavior and mechanical properties of Mg-Al-Si-Sn-Sr-Ag alloys withvariation of Ag contents (0.1, 0.5, 1.0, 2.0wt%). The ageing kinetics of Ag added alloys wasdetermined and affected by Ag addition. Although the precipitation of platelets of Mg17Al12 withinα-Mg matrix was not significantly affected by the silver, mechanical properties such as hardness andtensile properties were improved with increasing Ag contents
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/23/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.124-126.1469.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Effect of Ti on Formability of IF Steels (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 475-479 (Jan. 2005), p. 195-198 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The influence of the texture development in Ti-added (0.03, 0.05 and 0.07wt%) IF(Interstitial Free) steels on physical properties, especially ř -value was investigated. It was intended to determine the proper Ti content for the promotion of deep drawability as well as mechanical properties of IF steels. The precipitation behavior in the IF steels was clarified with the aid of computer simulation. The quantitative X-ray analysis on the texture development of IF steels was performed using pole figure and orientation distribution function measurement. For the IF steel with the composition of 0.025C, 0.070Mn, 0.002N and 0.007S, the optimum Ti content was found to be 0.05wt%
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/09/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.475-479.195.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Effects of Finishing Rolling Temperature on the Microstructural Behavior for Fe-0.1C Steel as a Function of Niobium Content (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 26-28 (Oct. 2007), p. 55-60 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The demand to replace Fe-V steel with Fe-Nb steel is evolving because of high costs of rawvanadium material. For the mass production of Fe-Nb steel, the most critical barrier is a poor impacttoughness comparing with that of Fe-V steel. This study covers a microstructural investigation forferrite grain size to explain the strength and toughness results as a function of V and Nb contents. Thesteel samples were made of three different compositions, i.e., Fe-V steel (Fe-0.05V-0.001Nb),Fe-V-Nb steel (Fe-0.014V-0.03Nb), and Fe-Nb steel (Fe-0.003V-0.033Nb). Rolling temperature toinitiate was 1150°C for the all experiments. However, rolling temperature to finish was set differentlyfor two conditions; 950°C and 860°C. The rolling to 860°C decreased the grain size for the ferritephase and increased the impact toughness rather than the case of 950°C. The Fe-V-Nb steel exhibitedsimilar value of the impact toughness with that for the Fe-V steel because of the low rollingtemperature to finish, i.e., 860°C. The whole replace of V with Nb decreased the impact toughnesssignificantly, however some extent of V content remained with Nb content showed the comparabletoughness to the Fe-V steel by optimizing the controlled rolling process
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/39/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.26-28.55.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Mechanical and Damping Properties of Squeeze Cast Hybrid Mg Matrix Composites (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 475-479 (Jan. 2005), p. 953-958 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Mg alloy is the lightest material of structural materials and is noticed for lightweight automotive parts because of excellent castability and damping capacity compared with Al alloy. But Mg alloy has poor corrosion resistance and high temperature creep properties. In this study, Mg matrix composites were fabricated by squeeze casting method to improve high temperature creep properties and damping capacity. The creep properties and damping capacity of hybrid Mg composites reinforced with Alborex(Aluminum borate whisker: 9(Al2O3)•2(B2O3)), graphite particle, and carbon fiber were improved in comparison with Mg alloy. Hybrid Mg composites reinforced with carbon fiber and Alborex were better than those reinforced with graphite particle and Alborex in mechanical properties, creep characteristics, and damping capacity, etc
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/09/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.475-479.953.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Properties of Cu-TiB〈sub〉2〈/sub〉 Composites Fabricated by In-Situ Liquid Melt Mixing Process (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 15-17 (Feb. 2006), p. 215-219 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: A Cu-TiB2 composite was successfully fabricated by in-situ liquid mixing process, and itsmicrostructure, mechanical properties as well as electrical conductivity were evaluated. ForCu-2vol.%TiB2 composite, the hardness was as high as 5GPa and the Young’s modulus was 130GPa.And hardness and Young’s modulus of Cu-6vol.%TiB2 composite was 5.6Gpa and 138GPa,respectively. With the increase of the TiB2 content, hardness and Young’s modulus ofCu-10vol.%TiB2 composite were 20 and 12%, respectively, which was higher than that ofCu-2vol.%TiB2 composite. Young’s modulus of the Cu-TiB2 composite in this paper was in goodagreement with the prediction by Hashin-Shtrikman (H-S) model. Furthermore, the electricalconductivity of the Cu-TiB2 composite showed its maximum value of about 78%IACS and decreasedwith the increase of the TiB2
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/39/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.15-17.215.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Effect of Al on the Castability, Tensile and Creep Properties of Mg-xAl-Zn (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 321-323 (Oct. 2006), p. 1370-1373 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The effect of Al content on the castability, tensile and creep properties of Mg-xAl-Zn alloywas investigated. The molten Mg-(3~11)Al-Zn alloys of 700 °C were poured into the mould designedto estimate castability. Tensile and creep tests were performed for the alloys. It has been shown thatcreep resistance decreased while tensile strength improved with increasing Al amount. Microstructurestudy revealed that morphology of Mg17Al12 is main factor determining the tensile and creepproperties of as cast Mg-xAl-Zn alloys. The final purpose of this study is to develop the heat resistantMg alloys to apply transportation systems such as automobile. Further study on effect of heattreatment and additional alloying elements on the microstructure and mechanical properties ofMg-xAl alloys is going to be performed
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/51/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.321-323.1370.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Effect of Sr and Sb on Microstructure and Mechanical Properties of Mg-5AI-2Si Alloys (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 321-323 (Oct. 2006), p. 1365-1369 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: A study has been made on the effects of antimony (Sb) and strontium (Sr) additions on themicrostructure of Mg-Al-Si alloys. Results showed that the additions of Sb and Sr can modify themorphology of Mg2Si particles from Chinese script shape to refined polygonal shape. Tensile strengthand creep resistance were improved and tensile elongation was also increased in the modified alloywith Sb and Sr. The addition of Sr was more effective than Sb modification of AS52 alloy for refiningmicrostructure and thus improving properties
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/51/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.321-323.1365.pdf
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