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  • 1
    Electronic Resource
    Electronic Resource
    Resistance of the Transitional Region of Laser-Clad Coating on Electrolytic Low Titanium Aluminium Alloys to Multiple Impact Loading (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 2592-2594 
    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 multiple impact loading experiment was designed to investigate the cracking behavior in thetransitional regions of laser-clad iron base alloy on an electrolytic low titanium aluminium alloys undermultiple impact loading in this study. The concept of TCR (transitional crack ratio) was introduced toevaluate the crack resistance of the transitional regions to multiple impact loading (impact resistance).Results showed that the substrate temperature during laser cladding process and the scanning velocityhave significant influences on the microstructure of the transitional regions and then the impactresistances of the laser-clad iron alloy coating. The laser-clad iron base alloy coatings obtained at thesubstrate temperature within 275 ~ 320°C displayed the best impact resistance. Furthermore, the crackmechanism in the transitional regions was analyzed
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.2592.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Investigation on Wear Resistance of Al-Si-Ti Piston Alloys Produced by Electrolysis (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 905-910 
    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 wear resistance, microstructures, worn surface morphology, TiAl3 phases, eutectic Siparticles and the high density of dislocations of the Al-Si-Ti piston alloys have been studied by meansof SEM and TEM. The electrolytic low-titanium aluminium alloys were used to make the Al-Si-Tipistons alloy, the experiment results showed that the wear resistance of the Al-Si-Ti alloy was 1.49times of that of the Al-Si alloy, and the wear mechanism was mainly plastic deformation wear. Therelationship between wear resistances and the yield strength of the Al-Si-Ti piston alloys wereestablished, and the wear mechanism investigated by mean of plastic-elasticity theory. When Ticontent is reached to 0.12%, the yield strength of the Al-Si-Ti piston alloy increased from 255 Mpa to358 Mpa
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.905.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    HRTEM Analysis of Aging Electrolytic Low-Ti Al Alloy (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 1015-1020 
    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: Electronic tensile testing, scanning electron microscope, transmission electronmicroscope, X-ray diffractometer and high resolution transmission microscope were employed toinvestigate the mechanical properties, microstructure, tensile fracture and morphology of theprecipitated phases of an electrolytic low-titanium wrought 6009 aluminum alloy. Results showedthat the mechanical properties of the electrolytic aluminum sheet were improved by solid solutiontreatment incorporating with pre-aging treatment. The tensile strength and extensibility wereenhanced by a factor of 23% and 38% by pre-aging treatment at 150 °C for 5 minutes respectively;a large quantity of nucleation sites of β˝ phase were generated by pre-aging treatment, which waspropitious to the transformation from solid solution state to GP zone, and the stable size of GP zoneformed during the pre-aging process promoted the precipitation of Mg2Si phase. The Mg2Si phasewas revealed by HRTEM and the crystalline stripes were obtained by Fourier transformation
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.1015.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Effects of Titanium Refining Methods on the Microstructure and Mechanical Properties of A356-0.1%Ti Alloys (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 937-940 
    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 titanium refining methods on the microstructure and mechanical properties ofA356 alloys were studied. The results showed that the A356 alloys refining by electrolytic lowtitanium Al alloys had excellent grain refinement effect and high age-hardening behavior comparingwith the traditional A356 alloys. By means of DSC analyses, the solidification characteristics and theage-hardening behavior were discussed. The results showed that the E-A356 alloys had morepowerful nucleation potency than that of the M-A356 alloys. The exothermic peaks of β// phase wasshifted to a slightly lower temperature, and the rate of the continuous transition from GP zone tometastable phases increased
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.937.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Study on the In Situ SEM Tension Observation of E-A356 Alloys (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 561-565 (Oct. 2007), p. 147-150 
    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 fracture mechanisms of E-A356 alloys (T5 treatment) have been investigated bymeans of in situ SEM under nonaxial tension loading. It is found that the crack initiated at the castingdefects, such as at the gas or the shrinkage pores, because of the debonding of the silicon particlesfrom the Al matrix. The crack propagation was mainly in the Al matrix and along the matrix/particleinterface secondarily. The crack growth could be influenced by the eutectic silicon particles, when itencountered the Si particles, the growth direction would be changed and turned toward the weakerareas. The fracture resistance or the mechanical properties of the E-A356 alloys will be improved bymeans of reducing, eliminating gas or shrinkage pores and increasing the interface bound strength ofthe eutectic silicon particles with the Al matrix
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/17/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.561-565.147.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    NiCr Alloy Coating Deposited on the Surface of 35CrMo Steel by the Electrospark Process (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 575-578 (Apr. 2008), p. 827-832 
    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: Strengthened coating on the surface of 35CrMo steel alloy was deposited byelectrospark process using NiCr electrode. The bond strength and microhardness of the coating waschecked and the microstructure of the strengthened coating was analyzed using the opticalmicro-scope, X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersionspectrum (EDS). The results show that the bond strength between the coating and the base metal is495.1MPa, and the hardness of the coating surface is about 2 times than that of the base metal, andthe property of the workpieces surface has become better. The coating is a metallurgical reactingbonding layer between the base metal and the NiCr electrode, and its main ingredients are FeNi andNiCrFe
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.575-578.827.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    The Computer Solidification Simulation of Oceangoing Freighter Rudder Horn (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 575-578 (Apr. 2008), p. 22-26 
    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 numerical solidification simulation for oceangoing freighter rudder horn steel castinghas been made and the location and reasons forming casting defects have been predicted byHUAZHU CAE software. Simulating result shows that the casting perfects can be realized by meansof the technological optimization and rationally assembling gating system, risers and iron chill. Aftermagnetic particle detection and ultrasonic inspection, the properties and microstructure of theoceangoing freighter rudder horn steel casting are in accord with the standard of USA, Germany andJapan
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.575-578.22.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Casting Process Simulation of the Ball Milling Machine End Cover with a Hug Diameter (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 575-578 (Apr. 2008), p. 98-103 
    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 solidification process, the formation mechanism and distribution law ofmicroporosity of the ball milling machine head cover made by SVEDALA corporation of USA weresimulated by computer. The Solidworks software was used to generate three-dimensional model ofcast parts and the Hua-casting software was employed to simulate the casting process. Thesimulated results show that significant microporosity was found in the middle of two casting headsand at the place of gudgeon journal because of insufficient chilling degree. The processingrationality was judged through the computer-aided technology, by which some drawbacks of thetraditional process were overcome and the process design quality was improved
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.575-578.98.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Microstructures of Rapidly Solidified Hypereutectic Al-Si Alloy with Low-Titanium Content (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 575-578 (Apr. 2008), p. 27-31 
    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 the present work, rapidly solidified alloys strips with Al-0.24Ti and Al-21Si-0.24Ti(inwt.%) were prepared by single roller melt-spinning method. The microstructures, phase andmorphology characteristics of the resultant strips were characterized by means of scanning electronmicroscopy (SEM),transmission electric microscopy (TEM) and XRD technique. The results showthat the grains have been refined after rapid solidification processing, and the micro-nanocrystallinegrain are formed. The morphology characteristics can be changed. The microstructures of Al-0.24Tialloys strip are micro-nanostructure α-Al solid solutions which are similar with granular or nodular,the corresponding SAD pattern is rings, it presents characteristic of polycrystal; Compared withequilibrium solidification, the microstructures of hypereutectic Al-Si alloy are changed obviously.They are composed of primary micro-nanostructure α-Al supersaturated solid solution andnanocrystal granular (α+Si) eutectic which set in the supersaturated solid solution. The nucleation andgrowth of primary silicon are suppressed and primary silicon can not precipitate, meanwhile, α-Alphase is nucleated which prior to eutectic, therefore the microstructures become into the metastablestate. The mechanism of the formation for microstructures of melt-spinning alloys has also beendiscussed
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.575-578.27.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Local Structures and Decomposed Phases of Laser-Melted ZrSiO〈sub〉4〈/sub〉 (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 368-372 (Feb. 2008), p. 1552-1554 
    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: Behaviors of CO2 and pulsed YAG laser melting of ZrSiO4 have been investigated usinginfrared (IR) spectroscopy. The laser-melted ZrSiO4 decomposed into binary oxides (ZrO2 and SiO2),while other phases or complex ZrSiO4 tetrahedron networks are also observed. The local structures andthe phases of the quenched melts depend strongly on the quenching rate and melting conditions.Monoclinic ZrO2 are found to be the main ZrO2 phase in the samples treated by CO2 laser, althoughtetragonal ZrO2 was found near boundaries between the untreated and melted regions. High concentrationsof tetragonal ZrO2 were detected in the samples treated by pulsed YAG lasers. Observations indicatethat the formation of tetragonal ZrO2 is related to relatively high quench rates. Micro-IR data from areasnear the boundaries between the quenched melts and untreated zircon show systematic variations of localstructures and compositions. A small region with relatively low density between the untreated and meltedboundaries was observed, which consists of tetragonal ZrO2 or glassy ZrO2, and SiO2. Broad vibrationalbands occur in the wave number region where the characteristic frequencies of zircon are located. Thisobservation could indicate the possible existence of small amounts of glassy ZrSiO4 in the melt state ofzircon, although zircon tends to decompose above the melting point
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.368-372.1552.pdf
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