Paper Title:
The Influence of Electric Current Pulses on the Microstructure of Magnesium Alloy AZ91D
  Abstract

The microstructure evolution of magnesium alloy AZ91D solidified with different electric current pulses and cooling rates was investigated and a new method, Low-voltage Electric Current Pulses (LVECP), to produce semi-slurry magnesium alloy was developed in this paper. The experimental results showed that the electric current pulses during solidification changed morphology of dendrites and the equiaxed, non-dendritic grains formed. The size of the primary a-Mg particles in semi-solid AZ91D alloy and the sphericity of the particles decreased with increase of discharging the voltage and treating time of LVECP. The increase of the cooling rate during the solidification of AZ91D alloy with LVECP promoted the formation of finer a-Mg particles, but the value of the sphericity of the particles rised. The formation of equiaxed, nondendritic structure by LVECP might be attributed to the electric current pulses increase the nucleation rate, restrained growth of the dendrites, and made dendrite arms remelted during the solidification of AZ91D alloy.

  Info
Periodical
Materials Science Forum (Volumes 488-489)
Edited by
W.Ke, E.H.Han, Y.F.Han, K.Kainer and A.A.Luo
Pages
201-204
DOI
10.4028/www.scientific.net/MSF.488-489.201
Citation
Y. S. Yang, Q. Zhou, Z. Q. Hu, "The Influence of Electric Current Pulses on the Microstructure of Magnesium Alloy AZ91D", Materials Science Forum, Vols. 488-489, pp. 201-204, 2005
Online since
July 2005
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Hwa Chul Jung, Ye Sik Kim, Kwang Seon Shin
Abstract:The demand for magnesium alloys has increased significantly during the past decade in the automotive and electronic industries where weight...
397
Authors: Guo Fa Mi, Cui Fen Dong, Chang Yun Li, Hai Yan Wang
Abstract:Cast, sub-rapidly solidified and rapidly solidified Al-5Fe alloy and Al-5Fe-3Y alloy were respectively prepared by vacuum melting, suction...
2462
Authors: Chang Jiang Song, Yuan Yi Guo, Liang Zhu, Ke Feng Li, Min Yang, Qi Jie Zhai
Abstract:High chromium cast iron alloys are widely used to produce wear resistant components. However, formation of the large carbides restricts their...
44
Authors: Da Zhi Zhao, Fu Xiao Yu, Fang Liu, Ke Zhun He
Chapter 2: Micro / Nano Materials
Abstract:The billets of AlMg0.9Si0.7 alloy, which were cast through the direct chill (DC) casting process of low superheat, were...
549
Authors: W.M. Mao, Z.Z. Chen, H.W. Liu, Y.G. Li
Chapter 4: Process Development
Abstract:The semi-solid slurry of A356 aluminum alloy was prepared through a serpentine pouring channel, which is a new method proposed recently for...
404