Effect of Ultrasonic Power on Solidification Structure and Porosity in Commercial Pure Magnesium

He Lina; Li Junwen

doi:10.15980/j.tzzz.2013.02.017

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Effect of Ultrasonic Power on Solidification Structure and Porosity in Commercial Pure Magnesium
Vol. 33, Issue 2, Pages: 182-185(2013)
Published： 2013 ，
DOI： 10.15980/j.tzzz.2013.02.017

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[1]何丽娜,李军文.超声波功率对工业纯镁凝固组织及除气的影响[J].特种铸造及有色合金,2013,33(02):182-185.

He Lina, Li Junwen. Effect of Ultrasonic Power on Solidification Structure and Porosity in Commercial Pure Magnesium. [J]. Special Casting & Nonferrous Alloys 33(2):182-185(2013)
[1]何丽娜,李军文.超声波功率对工业纯镁凝固组织及除气的影响[J].特种铸造及有色合金,2013,33(02):182-185. DOI： 10.15980/j.tzzz.2013.02.017.

He Lina, Li Junwen. Effect of Ultrasonic Power on Solidification Structure and Porosity in Commercial Pure Magnesium. [J]. Special Casting & Nonferrous Alloys 33(2):182-185(2013) DOI： 10.15980/j.tzzz.2013.02.017.

摘要

应用金相显微镜观察了不同超声波功率下工业纯镁试样的表面气孔含量

研究了超声波功率对工业纯镁凝固组织的影响。结果表明

未施加超声波时

试样的枝晶宽大

枝晶平均长度和宽度分别是19.23mm和5.96mm;在不同超声波功率条件下

随着超声波功率升高

铸锭中粗大的柱状晶枝晶长度和宽度先减小后增大

功率为250、500、750、1000W对应枝晶长度分别是19.23、14.42、12.07和14.61mm;宽度分别是5.58、3.08、2.21和4.99mm。此外

当超声波功率为0、250、500、750和1000W时

所得试样的气孔率分别是11.2%、3.4%、1.9%、1.48%和2.24%。可以看出

铸锭内气孔率随着超声波功率的增大呈先迅速降低、后缓慢增高的趋势。

Abstract

Effects of different ultrasonic powers on solidification structure of commercial pure magnesium were investigated

and changes of porosity in surface of commercial pure magnesium were observed by OM（optical microscope）.The results show that the coarse columnar dendrites can be observed in the sample without ultrasonic treatment

where the average length and width reach 19.23mm and 5.96mm

respectively.With the increase of ultrasonic power

the coarse columnar crystals in the ingot are refined firstly and then coarsened.The average length of dendritic crystals is changed from 19.23mm to 14.42mm to 12.07mm and to 14.61mm;and the average width is changed from 5.58mm to 3.08mm to 2.21mm and to 4.99mm

corresponding to ultrasonic power of 250

500

750and to 1 000W.In addition

the porosity of the products obtained is changed to 11.2%、3.4%、1.9%、1.48%and to 2.24%

corresponding to ultrasonic power of 0

250

500

750and 1 000 W.The results show that with the increase of ultrasonic power

the porosities in the ingot is decreased rapidly at first and then increased slowly.