Paper Title:
Effects of Al/Zn Ratio on the Microstructure and Strengthening of Mg-Al-Zn Alloys
  Abstract

The morphology and crystallography of precipitates formed in three Mg-Al-Zn alloys containing various Al/Zn ratios, conventionally designated as AZ91, AZ64 and AZ46, were characterized, and the mechanical properties determined. Three morphologically and crystallographically different types of lath- or rod-shaped γ-(Mg17All2) precipitates were identified in AZ91, and needle-like η-(MgZn2) in addition to γ-(Mg17All2) occurred in the alloys containing higher Zn. With increasing Zn content, i.e. with decreasing Al/Zn ratio, the fraction of γ-(Mg17All2) decreased, while that of η-(MgZn2) increased. The peak aged hardness and tensile properties of the alloys were slightly decreased, rather than increased, with increasing the Zn content from AZ91 through AZ64 to AZ46. The mechanism by which the γ-(Mg17All2) and η-(MgZn2) precipitates affected the age strengthening of the alloys was discussed in terms of the morphology, crystallography, interfacial structure, and relative quantity of the precipitates, and of their ability to block dislocation basal slip in the Mg-rich matrix.

  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
205-210
DOI
10.4028/www.scientific.net/MSF.488-489.205
Citation
C. P. Luo, J. W. Liu, H. W. Liu, "Effects of Al/Zn Ratio on the Microstructure and Strengthening of Mg-Al-Zn Alloys", Materials Science Forum, Vols. 488-489, pp. 205-210, 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: Shang Ming He, Xiao Qin Zeng, Li Ming Peng, Xin Wu Guo, Jian Wei Chang, Wen Jiang Ding
Abstract:The microstructure, mechanical properties, creep and corrosion resistance of Mg-Gd-Y-Zr(-Ca) alloys were studied. Small additions of 0.4-0.6...
101
Authors: S.G. Shabestari, M.M. Hejazi, M. Bahramifar
Abstract:The effect of magnesium addition up to 0.9 wt.% on the microstructure and mechanical properties of Al-9Si-0.35Mn alloy has been investigated...
415
Authors: Zheng Tian, Zhan Yi Cao, Jian Meng
Abstract:The effect of yttrium addition and heat treatment on the mechanical properties and microstructure of AM60 magnesium alloy have been...
1319
Authors: Hong Wei Liu, Yon Gan Zhang, Jian Bo Zhang, Bao Hong Zhu, Feng Wang, Zhi Hui Li, Xi Wu Li, Bai Qing Xiong
Chapter 1: Materials Properties
Abstract:Microstructural characterization of Al-Cu-Mg-Ag alloy ageing at low and elevated temperature were investigated by differential scanning...
1225
Authors: Dai Dong Zhang, Xiao Ru Zhang, Xiu Qin Ge, Da Qing Fang, Xue Hua Yu
Chapter 2: Modeling, Analysis and Simulation of Manufacturing Processes
Abstract:The effect of low content of Ca (0.9 or less)on the microstructure and mechanical properties of AZ63 alloys were studied in this paper. The...
579