scholarly journals Microstructure refinement of 7150 aluminum alloy ingot with rectangular section by applying forward-reverse electromagnetic stirring

2019 ◽  
Vol 69 (1) ◽  
pp. 30-35
Author(s):  
Yuichiro Murakami ◽  
Mingjun Li ◽  
Isao Matsui ◽  
Naoki Omura
Keyword(s):  
Aluminum Alloy ◽  
Electromagnetic Stirring ◽  
Rectangular Section ◽  
Alloy Ingot ◽  
Microstructure Refinement

Microstructure and Macrosegregation of Ф508 mm 7050 Aluminum Alloy Billet under Internal Electromagnetic Stirring

2020 ◽  
Vol 993 ◽  
pp. 130-137
Author(s):  
Yang Qiu ◽  
Zhi Feng Zhang ◽  
Hao Dong Zhao ◽  
Yong Tao Xu
Keyword(s):  
Grain Size ◽  
Aluminum Alloy ◽  
Electromagnetic Stirring ◽  
Alloying Elements ◽  
Homogeneous Distribution ◽  
Second Phase ◽  
7050 Aluminum Alloy ◽  
Fine Microstructure

To obtain fine microstructure and homogeneous distribution of alloying elements in the large-sized billet, the internal electromagnetic stirring as a new electromagnetic stirring method was proposed and utilized for the preparation of Ф508 mm 7050 aluminum alloy billet. The results demonstrate that the internal electromagnetic stirring could refine the microstructure and second phase, and alleviated the macrosegregation significantly. The grain size at the edge, 1/2 radius, and center of the billet decreased to 180 μm, 175 μm, and 185 μm, respectively. Moreover, the relative macrosegregation of Zn, Mg, and Cu at the edge and center decreased to 3.9% and 2.8%, 2.3% and 1.6%, 4.1% and 2.5%, respectively.

The Research on the Annulus Electromagnetic Stirring for Preparing the Semisolid A356 Aluminum Alloy Slurry

2014 ◽  
Vol 217-218 ◽  
pp. 241-246
Author(s):  
Yue Long Bai ◽  
Jun Xu ◽  
Zhi Feng Zhang
Keyword(s):  
Aluminum Alloy ◽  
Electromagnetic Stirring ◽  
A356 Aluminum Alloy ◽  
Primary Particles ◽  
A356 Aluminum ◽  
Semi Solid ◽  
Gap Width

The effects of annulus gap width, stirring power and stirring frequency on the microstructure of the semi-solid A356 aluminum alloy slurry have been investigated by the annulus electromagnetic stirring (AEMS) technology The results show that narrow annulus gap , strong stirring power and high stirring frequency are advantageous to obtain the small spherical primarymicrostructure, the smaller the annulus gap width is, the bigger the stirring power is, and the higher the stirring frequency is, the more uniform, the smaller and the more spherical the microstructure is. So the high stirring frequency, narrow annulus gap, strong stirring power are beneficial to obtain the fine and spherical semisolid microstructure in AEMS. Also the results indicate that the primary particles are globular, small and distribute homogeneously in the AEMS.

Effect of UDC Casting on Hot Deformation Behavior and Properties of 2A14 Aluminum Alloy

2019 ◽  
Vol 944 ◽  
pp. 46-51 ◽  
Author(s):  
Yang Qiu ◽  
Zhi Feng Zhang ◽  
Hao Dong Zhao ◽  
Bao Li ◽  
Chun Sheng Chen
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Deformation Behavior ◽  
Direct Chill ◽  
Electromagnetic Stirring ◽  
Ring Rolling ◽  
Compression Tests ◽  
Hot Deformation Behavior ◽  
Dislocation Glide ◽  
Dominant Deformation Mechanism

Uniform direct chill (UDC) casting is coupled annular electromagnetic stirring and intercooling, having been utilized for the preparation of large-sized aluminum alloy billet. In this paper, the UDC casting was applied to 2A14 aluminum alloy billets with a diameter of 584 mm. Hot compression tests, cogging and ring rolling procedures were carried out for the billets, respectively. The results show that during the deformation temperature of 420 °C and the strain rate of 0.01 s−1 to 10 s−1, the flow stresses of different positions are higher and more stable in the UDC casting billet than in the normal direct chill (NDC) casting billet. The dislocation glide is the dominant deformation mechanism of 2A14 aluminum alloy. Meanwhile, the UDC casting significantly improves the mechanical properties of the rolled rings in tangential and axial directions compared with the NDC casting.

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