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Mi G.,Henan Polytechnic University | Zhang J.,Henan Polytechnic University | Zhang J.,Henan Pingyuan Optics Electronics Co. | Wang H.,Henan Polytechnic University
Key Engineering Materials | Year: 2011

Alloys were produced by casting of Cu-Al-Fe-Be and Cu-Al-Fe-Ni aluminum bronzes and aged. The microstructures and mechanical properties were evaluated. The results indicated that solution and aging treatment can significantly improve the plasticity of Cu-Al-Fe-Be and Cu-Al-Fe-Ni, while the strength and hardness remained in the quenched level. Extending the aging time can effectively enhance the mechanical properties of alloys, and the longer the aging time, the higher the electric resistance of alloys. According to the results, the mechanical properties of the Cu-Al-Fe-Be alloy can be improved remarkably by solution treatment for 120 min at 950°C, followed by aging treatment for 120 min at 350°C, and quenched. While the most suitable heat treatment for the Cu-Al-Fe-Ni alloy was solution treatment 120 min at 950°C, followed by aging for 120 min at 450°C, and quenched. The experimental result also suggested that the Cu-Al-Fe-Be alloy possessed higher hardness and tensile strength compared to the Cu-Al-Fe-Ni alloy. Source


Wang K.,Henan Polytechnic University | Xu G.,Henan Pingyuan Optics Electronics Co. | Zhou Z.,Henan Pingyuan Optics Electronics Co. | Zhang J.,Henan Polytechnic University | And 2 more authors.
Tezhong Zhuzao Ji Youse Hejin/Special Casting and Nonferrous Alloys | Year: 2014

Different protective methods of the gypsum mold for gravity casting of magnesium alloy were analyzed comparatively. The results show that manufacturing process by using borate and gypsum powder mixed protection is simple, however, it may affect cure of gypsum slurry. By using manufacturing process of watering borate after mold baking, the oxidation on casting surface exhibits serious. Manufacturing process by watering borate after borate and gypsum powder mixing baking exhibits the oxidation-free and desirable ignition-proof efficiency, however, due to increasing procedure, the method is only suitable for the small batch of production of magnesium alloy parts. Source


Wang K.,Henan Polytechnic University | Xu G.,Henan Pingyuan Optics Electronics Co. | Zhou Z.,Henan Pingyuan Optics Electronics Co. | Zhang J.,Henan Polytechnic University
Tezhong Zhuzao Ji Youse Hejin/Special Casting and Nonferrous Alloys | Year: 2015

Effects of pouring method on microstructure of ZL205A alloy in sand mold casting were investigated comparatively. The results show that, for low pressure casting, compared with gravity casting, grain size in the alloy is refined due to the solidification under pressure, and microporosity in the alloy castings is decreased significantly with density increase. In addition, the experiment also reveals that the as-cast grain is sensitive to chilling effect, where with increasing in cooling rate, grain size is decreased. For the conventional casting, as a result of the slow cooling rate at the later stage of solidification, θ-Al2Cu phase may be precipitated in form of lamellar in α-Al matrix, affecting as-cast strength of ZL205A alloy. ©, 2015, Journal Office of Special Casting and Nonferrous Alloys. All right reserved. Source


Wang K.-F.,Henan Polytechnic University | Zhang J.-Z.,Henan Pingyuan Optics Electronics Co. | Lu S.-L.,Henan Pingyuan Optics Electronics Co. | Zhou Z.-J.,Henan Pingyuan Optics Electronics Co.
Zhuzao/Foundry | Year: 2015

The experiment was done to study the effect of gypsum mold protection methods on oxide inclusion of ZM5 magnesium alloy by vacuum pouring. The results show that by using SF6 atmosphere protection and vacuum pouring, some local oxidation was found on the surface and inner of poured sample. By combining SF6 atmosphere and borate protection, inner oxidation of cast samples decrease and its mechanical strength is relatively high. Therefore, this method not only solves the filling problem of ZM5 alloy, but also reduces the difficulty of mold protection. © 2015, Chinese Mechanical Engineering Society. All right reserved. Source


Mi G.F.,Henan Polytechnic University | Zhang J.Z.,Henan Polytechnic University | Zhang J.Z.,Henan Pingyuan Optics Electronics Co. | Lv S.L.,Henan Pingyuan Optics Electronics Co. | Wang P.,Henan Pingyuan Optics Electronics Co.
Advanced Materials Research | Year: 2011

Wear behaviour of aged casting Cu-Al-Fe-Be and Cu-Al-Fe-Ni aluminum bronzes was studied in this paper. The microstructures, mechanical properties of hardness and tensile strength, were evaluated experimentally. The friction and wear resistance, and the electrical resistivity of the materials were assessed. The results show that mechanical properties of the Cu-Al-Fe-Be alloy have been improved by solution treatment at 950° C for 120 min followed by aging at 350° C for 120 min, whilst the most suitable heat treatment for the Cu-Al-Fe-Ni alloy was solution treatment at 950 deg; C for 120 min followed by aging at 450° C for 120 min. In the wear testing, the as-cast alloys was dominated by abrasive wear, and the increase in load and sliding velocity, the adhesive wear and oxidation wear dominated. The experimental results also showed that the Cu-Al-Fe-Be alloy possessed higher hardness and tensile strength, lower friction coefficient and lower wear rate compared to the Cu-Al-Fe-Ni alloy. © 2011 Trans Tech Publications. Source

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