Study on Electromagnetic Vibration Casting (EVC) of Magnesium Alloys

2007 ◽  
Vol 546-549 ◽  
pp. 207-210
Author(s):  
Qi Chi Le ◽  
Shi Jie Guo ◽  
Zi Qiang Zhang ◽  
Jian Zhong Cui ◽  
Z.Z. Zhao
Keyword(s):  
Magnesium Alloy ◽  
Magnesium Alloys ◽  
Vibration Frequency ◽  
Large Diameter ◽  
High Quality ◽  
Light Alloys ◽  
Electromagnetic Vibration ◽  
Dc Casting ◽  
Vibration Casting ◽  
Solidification Microstructures

Electromagnetic Vibration Casting (EVC) is a new effective technical processing for optimizing solidification microstructures of light alloys. In this paper, this technology was induced into magnesium alloy DC casting for providing high-quality large diameter billets. The effects of vibration frequency and current intensities on the microstructures of large diameter billets were investigated. The results indicate that electromagnetic vibration would refine grains and the reduce macrosegregation effectively.

Effect of Electromagnetic Vibration on Microstructures of Semi-Continuous Casting AZ80 Magnesium Alloy Billet

2010 ◽  
Vol 146-147 ◽  
pp. 1797-1800
Author(s):  
Zhi Qiang Zhang ◽  
Qi Chi Le ◽  
Jian Zhong Cui ◽  
Shi Jie Guo
Keyword(s):  
Magnetic Field ◽  
Magnesium Alloy ◽  
Continuous Casting ◽  
Uniform Distribution ◽  
Alternating Magnetic Field ◽  
Stationary Magnetic Field ◽  
Electromagnetic Vibration ◽  
Az80 Magnesium Alloy ◽  
Dc Casting ◽  
Vibration Casting

Microstructures and macrosegregation of AZ80 magnesium alloy billets cast with and without the electromagnetic vibration were investigated. Compared with the conventional DC casting, microstructures of the billet have been greatly refined and the macrosegregation had been effectively reduced in electromagnetic vibration casting conditions. Increasing the electromagnetic vibration intensity, including both the stationary magnetic field and alternating magnetic field, leads to finer grains and more uniform distribution of solute elements in the billet.

Microstructures of DC Cast Light Alloys under the Influence of Intensive Melt Shearing

2011 ◽  
Vol 690 ◽  
pp. 137-140 ◽  
Author(s):  
Yu Bo Zuo ◽  
Bo Jiang ◽  
Zhong Yun Fan
Keyword(s):  
Grain Refinement ◽  
Heterogeneous Nucleation ◽  
Solidification Process ◽  
Casting Process ◽  
Direct Chill ◽  
Light Alloy ◽  
High Quality ◽  
Light Alloys ◽  
Refined Microstructure ◽  
Dc Casting

A new direct chill (DC) casting process, melt conditioned DC (MC-DC) process has been developed for production of high quality ingots and billets of light alloys. In the MC-DC casting process, intensive melt shearing provided by a newly developed rotor-stator unit is used to control the solidification process during the DC casting with a conventional DC caster. Experimental results of DC casting of Al- and Mg-alloys with and without intensive melt shearing have demonstrated that the MC-DC casting process can produce light alloy billets with significantly refined microstructure and substantially reduced cast defects. The effect of intensive melt shearing on grain refinement has been mainly attributed to the enhanced heterogeneous nucleation on well dispersed oxides occurring naturally in the alloy melt.

Ultrasonic Treatment of Magnesium Alloy Melts and its Effects on Solidification Microstructures

2007 ◽  
Vol 546-549 ◽  
pp. 129-132 ◽  
Author(s):  
Zi Qiang Zhang ◽  
Qi Chi Le ◽  
Jian Zhong Cui
Keyword(s):  
Magnesium Alloy ◽  
Magnesium Alloys ◽  
Ultrasonic Treatment ◽  
High Intensity ◽  
Processing Time ◽  
Ultrasonic Processing ◽  
Ultrasonic Power ◽  
Melt Treatment ◽  
Ultrasonic Melt Treatment ◽  
Solidification Microstructures

The effects of high intensity ultrasonic melt treatment on the microstructure of magnesium alloys were investigated in this paper. Magnesium melts were treated with power ultrasonic wave and then cooled to a predetermined temperature. With the increase in ultrasonic power, the structure exhibited refined and spheroidzed crystal grains. After further increasing the ultrasonic power, the grains tended to somewhat coarsened. And increasing the ultrasonic processing time led to a grain refinement of magnesium alloy.

Study on Partial Remelting Microstructures and Mechanical Properties of ZK60-RE Magnesium Alloy

2006 ◽  
Vol 116-117 ◽  
pp. 279-283
Author(s):  
Wei Wei Shan ◽  
Zhi Ming Du ◽  
Shou Jing Luo
Keyword(s):  
Mechanical Properties ◽  
Solid State ◽  
Magnesium Alloy ◽  
Magnesium Alloys ◽  
Equal Channel Angular Extrusion ◽  
High Strength ◽  
High Quality ◽  
Partial Remelting ◽  
Semi Solid ◽  
Re Elements

ZK60-RE is a kind of high strength magnesium alloy. Here, starting materials are casting ZK60-RE magnesium alloy and ZK60-RE magnesium alloy extruded by equal channel angular extrusion (ECAE), reheating to semi-solid state and studied on their partial remelting microstructures by means of microscope. The results show that ZK60-RE magnesium alloy extruded by ECAE are much finer and lead to the formation of spheroids quite rapidly while RE elements modified casting need a little longer time. At the same time, the mechanical properties of two kinds of ZK60-RE magnesium alloys are given. To do that, we want to find better magnesium alloys with high mechanical properties and good thixotropy, which adapt to semi-solid process to form the high quality complex component one time.

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