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Ji J.-M.,Jiangsu University | Ji J.-M.,Key Laboratory of High end Structural Materials | Meng G.-C.,Jiangsu University | Meng G.-C.,Key Laboratory of High end Structural Materials | And 7 more authors.
Zhuzao/Foundry | Year: 2014

The samples of ZA40 alloy containing Si with 0.05% La-rich mixed RE and without RE were respectivelyconducted dry wear test at roomtemperature, 100℃ and 150℃ high temperature with 150 N in 30 min. The traces of wear and sectional morphology were observed. The effect of Rare earths addition to ZA40 containing Si on wear resistance of high temperature was investigated in this study. The result shows that rare earth addition can effectivelyimprove the wear resistance ofmaterials. Compared with roomtemperature, effect of RE is more clearly at high temperature. It was found that rare earth addition can effectively refine the aluminum-based phase and Cu-rich phase. Besides, the amount of needle-like eutectic silicon was reduced, and massive primarysilicon phase becomes small. Thus the strength ofmaterial was improved under the condition of hightemperature. Thereby, wear resistance of ZA40 containing Si was effectivelyimproved at high temperature.


Jiaming J.,Jiangsu University | Jiaming J.,Key Laboratory of High End Structural Materials | Guocui M.,Jiangsu University | Guocui M.,Key Laboratory of High End Structural Materials | And 5 more authors.
Open Mechanical Engineering Journal | Year: 2014

In testing comparison, this study is made on the modification effect of 0.05 wt.% La-rich rare earth (RE) upon as-cast microstructure, mechanical properties of materials at high temperatures (100, 150, 200°C) and wear resistance under different temperatures (100and 200°C) of ZA40 alloy containing Si. The addition of RE shows that it can not only effectively refine Al-rich and Cu-rich phase, but also reduce the amount of needle-like eutectic silicon, and then make the size of massive primary silicon phase smaller. Thus, there are the improvement of strength, ductility and wear resistance of materials at high temperature. The analyses are also conducted on the mechanism of underlying RE elements. © Jiaming et al.


Ji J.-M.,Jiangsu University | Ji J.-M.,Key Laboratory of High end Structural Materials | Meng G.-C.,Jiangsu University | Meng G.-C.,Key Laboratory of High end Structural Materials | And 3 more authors.
Advanced Materials Research | Year: 2013

Cu-Ce intermediate alloy was added to aluminum bronze alloy which contains Al, Ni, Fe and Mn to form a novel aluminum-bronze material of Cu-Al-Ni-Fe-Mn. The influence of the different concentrations of rare earth cerium on the mechanical properties, wear resistance and microstructures of as cast Cu-Al-Ni-Fe alloy has been investigated. The results indicate that the addition of an appropriate Ce content can effectively refine the microstructure and improve the tensile strength, ductility and wear resistance. When the alloy is added by 0.15% Ce, the grain is small, sleek and uniform distribution, the tensile strength, ductility and wear resistance of the alloy material can reach to the best performance, in which tensile strength is 731Mpa and elongation is 34%. However, when the rare earth cerium add to more than 0.20%, the block shape and shred of organization becomes large, which leads to the grain boundary roughening. The tensile strength, ductility and wear resistance are declining. © (2013) Trans Tech Publications, Switzerland.


Ji J.,Jiangsu University | Ji J.,Key Laboratory of High level Structural Materials of Jiangsu Province | Lu Y.,Zhenjiang Huitong Metal Forming Co. | Wu J.,Jiangsu University | And 3 more authors.
Tezhong Zhuzao Ji Youse Hejin/Special Casting and Nonferrous Alloys | Year: 2013

Effects of varied Ce addition, such as 0.05%, 0.15%, 0.25% in weight, on microstructure and wear resistance of Cu-Al-Ni-Fe-Mn aluminum bronze were investigated by OM (optical microscopy), SEM (scanning electron microscopy) and M-2000-type abrasion tester. The results indicate that the addition of proper Ce content can effectively refine the microstructure and improve the tensile strength, ductility and wear resistance. With 0.15% Ce addition, fine and round grain with uniform distribution can be observed in the Cu-Al-Ni-Fe-Mn alloy, and desirable wear resistance can be obtained. However, with 0.20% Ce addition, the polygonal and lamellar structure are increased in the alloy with the coarseness of grain boundary, leading to the deterioration of wear resistance of the alloy materials.

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