Paper Title:
Preparation of Large-Diameter Semi-Solid 7075 Aluminum Alloy Billets
  Abstract

Preparation of semi-solid microstructure of 7075 aluminum alloy industrial extrusion billets was studied in this paper. A new semi-solid microstructure preparation process is proposed. In the treatment, melting-stirring and predeformation of the alloy billets are not required. An ideal microstructure and higher dimensional precision of the billet can be obtained only with a direct heating and insulation method. The influences of different heating temperatures and insulation time on the microstructure evolution were studied with orthogonal testing methods. The obtained microstructure was observed and analyzed by optical microscopy, and the formation mechanism of the semi-solid microstructure is further discussed. The results indicate that a fine microstructure can be obtained with the proposed process and the processing parameters can be controlled over a wide range. Also, the grain microstructure obtained by the present process is better than that of the SIMA. For 7075 aluminum alloy billets, perfect fine equiaxial grains can be obtained under a heating temperature of 620°C and a holding time of about 25 minutes. The average grain size is around 80μm.

  Info
Periodical
Solid State Phenomena (Volumes 141-143)
Edited by
G. Hirt, A. Rassili, A. Bührig-Polaczek
Pages
361-365
DOI
10.4028/www.scientific.net/SSP.141-143.361
Citation
W. W. Wang, J. L. Song, S. J. Luo, "Preparation of Large-Diameter Semi-Solid 7075 Aluminum Alloy Billets", Solid State Phenomena, Vols. 141-143, pp. 361-365, 2008
Online since
July 2008
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: Ju Fu Jiang, Shou Jing Luo
Abstract:By using equal channel angular extrusion (ECAE) as strain induced step in strain induced melt activated (SIMA) and completing melt activated...
132
Authors: Kai Kun Wang, Peng Zhang, Yan Mei Du, Zeng Pan, Hong Gao Li
Abstract:Thixo-forming is in the forefront of metal processing technology in the 21st century. The research on thixo-co-extrusion of multi-layer tube...
73
Authors: Shi Kun Xie, Rong Xi Yi, Xiu Yan Guo, Xiao Liang Pan, Xiao Qiu Zheng
Abstract:In semi-solid remelting process, the various stages of reheating temperature and isothermal holding time must be accurately controlled in...
1
Authors: Fei Han, Wei Wei Wang, Shou Jing Luo, Zhi Ming Du
Abstract:The impeller is an important component applied in airplanes, ships and weapons. It is difficult to form the complicated geometry of the...
3852
Authors: Guang An Zhang, Cui Yan Ma, Qi Zhou
Abstract:Stress-induced melt activation (SIMA) has a certain advantage during the preparation of semi-solid billet of Mg alloy. However, Equal-Channel...
380