Microstructure and mechanical properties of low frequency electromagnetic casting 7075 aluminum alloy

金属学报(英文版), 2012, 25(2): 160-168.

^1, , ^2, , ^3, , ^4,

1.Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang 110819, China

2.Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang 110819, China

3.Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang 110819, China

4.Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang 110819, China

基金项目: This work was supported by the National Natural Science Foundation of China (Youth)(51004036) the Fundamental Research Funds(N110408005)

Microstructure and mechanical properties of low frequency electromagnetic casting 7075 aluminum alloy

Gaosong WANG ^1, , Zhihao ZHAO ^2, , Jianzhong CUI ^3, , Qiang GUO ^4,

1.Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang 110819, China

2.Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang 110819, China

3.Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang 110819, China

4.Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang 110819, China

Keywords： LFEC

This work explores the microstructure of low frequency electromagnetic casting (LFEC) 7075 aluminum alloys and investigates the effect of heat treatment process on its mechanical properties via the mechanical properties test,X-ray diffraction and transmission electron microscopy.It was found that the grains of LFEC ingot were finer and more evenly distributed than that of the conventional direct chill cast (DC) ingots.The microstructure of LFEC ingot extruded kept their original as-cast structure with small and fine grains.With the same extrusion ratio,the average grain diameters of LFEC and conventional DC extruded were about 10 and 20 μm,respectively.LFEC extruded also had a better aging property,since the regime of T6 treatment peak value aging was at 120 ℃ for 24 h,the tensile strength and hardness (HV) of the LFEC extruded were 673.50 MPa and 194.62,respectively,which were all higher than those of the conventional DC extruded,indicating that the process regime can be applied in the industrial production.

参考文献

[1]	L.Beitelman .Effect of Mold EMS Design on Billet Casting Productivity and Product Quality[J].Canadian Metallurgical Quarterly,1999(5):301-309.
[2]	K.-H. SPITZER;Georg REITER;Klaus SCHWERDTFEGER .Multi-Frequency Electromagnetic Stirring of Liquid Metals[J].ISIJ International,1996(5):487-492.

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Microstructure and mechanical properties of low frequency electromagnetic casting 7075 aluminum alloy

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