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Han X.-W.,Inner Mongolia University of Technology | Zhang R.-Y.,Inner Mongolia University of Technology | Zhang R.-Y.,Key Laboratory of Light Metal Materials | Li Y.-H.,Inner Mongolia University of Technology | Wang P.,Inner Mongolia University of Technology
Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment | Year: 2015

Al-TiO2-C grain refiners were synthesized by the in-situ exothermic dispersion method using TiO2, C, Al and La2O3 powders as raw materials. The content of La2O3 in the refiners is 0, 0.1%, 0.2%, 0.3%, respectively. In the grain refiner performance test, the four composition refiners were added to industrial pure aluminum. The effects of La2O3 on the microstructure of Al-TiO2-C refiners were investigated by SEM, XRD and EDS analysis. The results show that the optimal La2O3 content in the refiners is 0.2%, in which the massive and disconnected Al3 Ti particles are uniformly distributed. A better refining effect of the refiner with 0.2% La2O3 on industrial pure aluminum is observed, and an amount of Al20Ti2La plays an important role in improving the performance of Al-TiO2-C grain refiner. ©, 2015, Editorial Office of Transactions of Materials and Heat Treatment. All right reserved.


Zhang X.-M.,Inner Mongolia University of Technology | Zhang X.-M.,Key Laboratory of Light Metal Materials | Zhang R.-Y.,Inner Mongolia University of Technology | Zhang R.-Y.,Key Laboratory of Light Metal Materials | Li Q.,Control Iron and Steel Research Institute, China
Advanced Materials Research | Year: 2011

The tubular electro-thermal component will produce thermal stress when water in the tube is heated by electricity, which is one of important factors to cause the fracture. In this paper, the finite element simulation and theoretical analyzing methods are used to analyze the thermal stress field of the electro-thermal component tube with different substrates, i.e., quartz glass and borosilicate glass. The result shows that under the same condition, the highest temperature of electro-thermal component using borosilicate glass substrate is higher than that using quartz substrate. When in service, the inner surface of electro-thermal component endures tensile stress and the outer surface endures compressive stress. The inner surface produces greater thermal stress and therefore fracture is more likely to emerge on the inner surface. Therefore, in order to prevent forming of the fracture and reduce the thermal stress, compared with borosilicate glass, priority should be given to quartz glass as the material for manufacturing electro-thermal component. © (2011) Trans Tech Publications Switzerland.


Chen S.-J.,Inner Mongolia University of Technology | Zhang R.-Y.,Inner Mongolia University of Technology | Zhang R.-Y.,Key Laboratory of Light Metal Materials | Shi Z.-M.,Inner Mongolia University of Technology | And 3 more authors.
Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment | Year: 2014

TiC and Al2O3 particles reinforced aluminum matrix composite was synthesized from TiO2, C and Al powder by the in-situ contact reaction method. The effects of La on the microstructure and corrosion resistance of 10%TiC-Al2O3/Al composite were investigated by SEM, XRD and electrochemical test. The results show that the optimal La content in composite is 0.2%, the amount of TiC and Al2O3 particles increases and the distribution of the particles becomes uniform. The rodlike A13Ti phase of the composites is transformed to massive Ti2Al20La phase. The microstructure of the composites with addition of 0.2%La is relatively well. The corrosion current density of the composites is relatively lower, which is 4.053×10-5A·cm-2, reducing by 81% compared with that of the composites not added La, capacitive reactance arc radius is relatively large, the corrosion resistance is relatively well. ©, 2014, Editorial Office of Transactions of Materials and Heat Treatment. All right reserved.


Zhang X.M.,Inner Mongolia University of Technology | Zhang X.M.,Key Laboratory of Light Metal Materials | Shi Z.M.,Inner Mongolia University of Technology | Shi Z.M.,Key Laboratory of Light Metal Materials | And 2 more authors.
Materials Science Forum | Year: 2011

In this paper, rare earth La modifying ZL101 alloy was studied by using of optical microscope, scanning electron microscopy, universal materials tester and small-load Brinell hardness. The influence of T6 heat treatment of the alloy's microstructure and properties was also studied. The results show that microstructure and mechanical properties of the alloy have much obvious modification effect at modification temperature (690°C). The microstructure and mechanical properties are improved remarkably when La content is up to 0.15wt%. © (2011) Trans Tech Publications.


Zhang R.-Y.,Inner Mongolia University of Technology | Zhang R.-Y.,Key Laboratory of Light Metal Materials | Shi Z.-M.,Inner Mongolia University of Technology | Shi Z.-M.,Key Laboratory of Light Metal Materials | And 2 more authors.
Rare Metals | Year: 2015

Hot compression behavior of TiC–Al2O3/Al composites was studied using the Gleeble-1500 system at a temperature range of 300–550 °C and at strain rate range of 0.01–10.00 s−1. The associated structural changes were studied by TEM observations. The results show that stress level decreases with deformation temperature increasing and strain rate decreasing, which can be represented by a Zener–Hollomon parameter in an exponent-type equation with hot deformation activation energy Q of 172.56 kJ·mol−1. Dynamic recovery occurs easily when strain rates are less than 10.00 s−1. Dynamic recrystallization can occur at strain rate of 10.00 s−1. © 2014, The Nonferrous Metals Society of China and Springer-Verlag Berlin Heidelberg.

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