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  • 1
    Electronic Resource
    Electronic Resource
    Aluminum Matrix Texture and Particle Characterization in Al-Al〈sub〉3〈/sub〉Ti FGMs Produced by a Centrifugal Solid-Particle Method (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 105 (July 2005), p. 415-420 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: The centrifugal solid-particle method has proved to be effective in producing functionally graded materials (FGMs). In this study, Al-Al3Ti FGMs, were produced by this centrifugal method, from an Al-5 wt % Ti master alloy. Applied centrifugal forces were 30, 60 and 120G (units of gravity). Samples from the outer surface of each specimen were cut and aluminum matrix texture analyzed by Schulz reflection method. Analysis of the resulting pole figures indicates a preferred orientation along the (200) plane for the aluminum matrix crystals. Furthermore, increasing the applied centrifugal force enhances the orientation effect. Al3Ti platelet orientation and area fraction at the samples’ outer surface along three observation planes were also measured. The Al3Ti platelets in the outer region are orientated perpendicular to the centrifugal force direction along two of the observed planes, also an increase in centrifugal force leads to an increase in orientation in those two planes. The intermetallic particle volume fraction also increases with higher applied centrifugal force, although not significantly. A correlation appears to exist between particle orientation and the preferred orientation of the matrix
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/21/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.105.415.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Influence of Microstructure on Electrochemical Properties of Severely Deformed Al-5 wt% Cu Alloy by ECAP (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 519-521 (July 2006), p. 705-710 
    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 microstructure on the electrochemical properties of an Al-5 wt% Cu binary alloywhich was severely deformed by equal-channel angular pressing (ECAP) has been investigated in aborate-boric acid buffer solution containing Cl¯ ions at pH 8.3 and 25°C by potentiodynamic polarization test.The anodic polarization results showed that pitting potentials of ECAPed Al-Cu alloy samples were higherthan that of the sample without ECAP and increased with repetitive ECAP passes. The pitting corrosionattack of Al-Cu alloy samples took place in the surroundings of Al2Cu (θ) phase. It is considered that thegrain refinement of θ phase and the solid solution generated in Al matrix during ECAP process areresponsible for the improvement of the corrosion resistance of ECAPed Al-Cu alloy
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/13/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.519-521.705.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Biodegradable Fiber Reinforced Ti Composite Fabricated by Spark Plasma Sintering Method (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 539-543 (Mar. 2007), p. 3201-3206 
    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: Ti and Ti alloys are particularly attractive materials as the metallic implant-material. Thisis because that these alloys have low shear modulus and the good biological compatibility with bone.However, interfacial adhesion ability of bone and Ti alloy is low. As improvement method of theinterfacial adhesion ability, bioaffinity material like hydroxyapatite has been coated on surface of theTi alloys. However, such bioaffinity materials have low strength and wear resistance. In this study, Ticomposites containing biodegradable poly-L-lactic-acid (PLLA) fiber were fabricated by sparkplasma sintering (SPS) method. The PLLA fiber plays a role as reinforcement in Ti matrix, and canbe gradually decomposed inside body with progress of time. By the decomposition of PLLA, pore isgenerated in Ti matrix, and bone simultaneously penetrates into the pore. Therefore, tightly bondbetween bone and Ti matrix can be expected. Using the Ti-PLLA composites fabricated by SPSmethod, microstructural observation and mechanical tests were performed. It was found thatTi-PLLA composite has laminate-layer structure with plate-like shape PLLA. Hardness and wearbehavior of Ti-PLLA composite has anisotropy due to its structure. However, strength of theTi-PLLA composite is low because of the imperfect sintering of Ti matrix. Since sintering of Timatrix can be improved by changing the temperature of SPS, Ti-PLLA composite with anisotropicmechanical properties can be expected by SPS method
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/15/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.539-543.3201.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Microstructural Evolution in a Commercial Al-Mg-Sc Alloy during ECAP at 300°C (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 558-559 (Oct. 2007), p. 569-574 
    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: Microstructural evolution taking place during equal channel angular pressing (ECAP) wasstudied in a commercial coarse-grained Al-6%Mg-0.4%Mn-0.3%Sc alloy at a temperature of 300oC(~0.6Tm). Samples were pressed using route A to a total strain of 12 and quenched in water after eachECAP pass. ECAP at moderate-to-high strains leads to the formation of a bimodal grain structure withgrain sizes of around 1 and 8 μm and volume fractions of 0.3 and 0.6, respectively. The development ofnew-grained regions has been shown to result from a concurrent operation of continuous dynamicrecrystallization that occurs during deformation and static recrystallization that occurs during each ECAPcycle by the exposure of the as-deformed material in the die kept at 300oC for around 1.5 minutes. Themicrostructural development during warm-to-hot ECAP is discussed in terms of the enhanced drivingforce for recrystallization, resulting from the evolution of high-density dislocation substructures due to thelocalization of plastic flow and inhibition of recovery in the present alloy
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/17/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.558-559.569.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Effects of SiO〈sub〉2〈/sub〉 Particles on Wear Behavior of Cu-SiO〈sub〉2〈/sub〉 Dispersion-Hardened Alloys (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 561-565 (Oct. 2007), p. 659-662 
    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: Effects of solid particles on wear behavior of dispersion-hardened alloy were investigatedusing Cu-SiO2 alloys containing 0.6vol.%SiO2, 1.2vol.%SiO2 and 1.7vol.%SiO2 particles. Wear testswere made using pin-on-disc type wear machine. Wear property of the Cu-SiO2 alloys is improved byincreasing volume fraction of SiO2 particles. Moreover, wear amounts of Cu-SiO2 alloys increasewith increasing the sliding distance, and then are saturated at exceeding about 1km. This is why thatSiO2 particle improves the strength of Cu-SiO2 alloy, and that the work hardening occurs on wornsurface. Wear-induced layer is formed just below worn surface by severe plastic deformation due towear, and its hardness increases as the volume fraction of SiO2 particles increases. From theseobtained results, wear process of Cu-SiO2 alloy was discussed
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/17/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.561-565.659.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Grain Refinement Performance of Aluminium Cast-Alloy by Deformed Al-Al〈sub〉3〈/sub〉Ti Alloy Refiner (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 519-521 (July 2006), p. 1859-1864 
    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: Grain refining experiments for casting of pure Al were conducted to evaluate the grainrefinement performance of an Al-5mass%Ti alloy refiner before and after cold rolling. Al3Tiparticles in the Al-Ti alloy refiner were efficiently fragmented by cold rolling. The size of theAl3Ti particles in cold rolled Al-Ti alloy refiner decreased from 280μm to 30μm with increasingreduction ratio of cold rolling. Mean size of α-Al grains in pure Al cast refined by the cold rolledAl-Ti alloy refiner decreased from about 500μm to 200μm with increasing the reduction ratio. Inorder to investigate mechanical property of the pure Al cast refined by the cold rolled Al-Ti alloyrefiner, Vickers hardness test and tensile test were conducted. Strength of the pure Al cast refinedby the cold rolled Al-Ti alloy refiner increased with increasing the reduction ratio. The strengthimprovement of pure Al cast refined by the cold rolled Al-Ti alloy refiner followed Hall-Petchrelationship. From obtained results, it was concluded that cold rolling for refiner is usefulpractical application for pure Al cast
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/13/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.519-521.1859.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Mechanical Properties of Al-5.7wt% Ni Eutectic Alloy Severely Deformed by Equal-Channel Angular Pressing (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 539-543 (Mar. 2007), p. 2916-2921 
    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: In this study, an Al-5.7wt% Ni eutectic alloy was subjected to severe plasticdeformation (SPD) by an equal-channel angular pressing (ECAP) technique. ECAP technique wascarried out by using two strain introduction methods, route BC and route A, at a temperature. It isfound that the Al-Ni eutectic alloy specimens after ECAP technique by route BC and route Amethods have very different microstructures which affected strongly the tensile properties of thespecimens. Namely, after ECAP technique by route BC method, the fine Al3Ni dispersoids ofabout 300 nm homogeneously dispersed in α-aluminum matrix and the samples appeared no clearanisotropic in tensile properties, while the eutectic textures containing α-Al and Al3Ni fibrousdispersoids have highly anisotropy distribution and are proved to have significant anisotropy tensileproperties after ECAP technique by route A method. Results of Young’s modulus andsimultaneous internal friction measured by dynamic mechanical analysis (DMA) were alsopresented. Based on the experimental results, the fracture mechanism during tensile process of theAl-Ni eutectic alloy by different strain induction methods was discussed
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/15/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.539-543.2916.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Effect of Processing Temperature on Microstructure Developmentduring ECAP of Al-Mg-Sc Alloy (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 584-586 (June 2008), p. 481-486 
    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: Microstructural evolution taking place during equal channel angular pressing (ECAP) wasstudied in a commercial coarse-grained Al-6%Mg-0.4%Mn-0.3%Sc alloy in a temperature interval 200-450oC (~0.5-0.8 Tm). Samples were pressed using route A to a total strain of 12 and quenched in waterafter each ECAP pass. Uniform fine-grained microstructures with the average grain sizes of 0.7 and 2.50m, are almost fully evolved at high ECAP strains at 250oC and 450oC, respectively, while ECAP at300oC (~0.6 Tm) leads to the formation of bimodal grain structure with fine grains of around 1 µm andrelatively coarse grains of around 8 µm. The latter are developed due to the occurrence of staticrecrystallization during “keeping” time in the ECAP channel and/or reheating between ECAP passes. Themicrostructural development under warm-to-hot ECAP conditions is discussed in terms of the largepotential for grain boundary migration resulted from an overlapping of accelerated grain boundarymobility at high pressing temperatures and enhanced driving force for recrystallization, which is caused bya strong inhibition of dynamic recovery in a heavily-alloyed Al alloy
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.584-586.481.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Corrosion Behavior of Al-7wt% Si-1.5wt% Cu Severely Deformed by Equal-Channel Angular Pressing (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 539-543 (Mar. 2007), p. 2892-2897 
    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: In this study, an Al-7 wt% Si-1.5 wt% Cu alloy was subjected to severe plasticdeformation (SPD) by an equal-channel angular pressing (ECAP) technique. The ECAP processwas repetitively carried out up to 8 passes using a strain introduction method of route BC, at atemperature of 25 °C and a pressing rate of 0.33 mm s-1. Microstructures of the samples beforeand after ECAP were observed by a scanning electron microscopy (SEM). Electrochemicalproperties of the Al-Si-Cu alloy fabricated by ECAP have been investigated in a borate-boric acidbuffer solution containing Cl¯ ions at pH 8.3 and 25 °C by potentiodynamic polarization test.Corrosion pits on the sample surface after anodic polarization were investigated by means of SEM.The anodic polarization showed that as-cast Al-Si-Cu alloy with plate-shaped Si particles has poorresistance against pitting corrosion comparing to quenched sample without ECAP. Pittingpotentials of ECAPed Al-Si-Cu alloy samples were higher than that of the sample without ECAP.In the Al-Si-Cu alloy, the corrosion pits were found in the region of Si particles and the size of pitsformed on the ECAPed samples became smaller than that without ECAP. It is considered that theimprovement of the pitting resistance of ECAPed Al-Si-Cu alloy is due to homogenous distributionof spherical Si particles generated during ECAP process
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/15/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.539-543.2892.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Effect of Processing Route on Microstructure and Texture Development in ECAP of Al-Ti Alloy (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 561-565 (Oct. 2007), p. 251-254 
    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: Microstructure and texture evolution during equal channel angular pressing (ECAP) ofAl-5 mass%Ti alloy are investigated for up to 8 passes via routes A and BC. Platelet-shaped Al3Tiparticles in the Al-5mass%Ti alloy are cracked severely with repetitive ECAP passes, and the meansize of the Al3Ti particles is decreased with increasing the number of ECAP passes.Microstructural observation showed that an Al–Ti supersaturated solid solution is formed during theECAP process. It is also found that the Al-Ti alloy after ECAP by route A and route Bc methodshave very different microstructures. Namely, after ECAP by route Bc, the fine Al3Ti particles arehomogeneously dispersed in Al matrix, while the microstructure has highly anisotropic distributionafter ECAP by route A
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/17/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.561-565.251.pdf
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