skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: TEM study of continuous precipitation in Mg-9 wt%Al-1 wt%Zn alloy[Transmission Electron Microscopy]

Abstract

The development of continuous precipitate morphology in heat-treated Mg-9 wt%Al-1 wt%Zn alloy (AZ91) for a range of ageing temperatures is investigated in detail using TEM. The matrix/precipitate orientation relationships (ORs), sizes, shapes and the number of precipitates per unit volume (N{sub V}) are described for ageing at temperatures from 70 to 300 C. Most of the continuous precipitates have a Burgers OR and are plate-shaped with the primary habit plane parallel to the basal plane of the matrix. These precipitates are initially lozenge-shaped plates that elongate with time at temperature to become long laths. Two other smaller populations of precipitates that have ORs different from the Burgers OR are also present. These precipitates are rod-shaped with their long direction either perpendicular to or inclined to the basal plane. The relationship between the continuous precipitate morphology and the hardness response is discussed and comparisons are made with high-strength aluminum alloys.

Authors:
Publication Date:
Research Org.:
CSIRO Manufacturing Science and Technology, Melbourne, Victoria (AU)
OSTI Identifier:
20075933
Resource Type:
Journal Article
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Volume: 48; Journal Issue: 8; Other Information: PBD: 11 May 2000; Journal ID: ISSN 1359-6454
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; MICROSTRUCTURE; HARDNESS; MAGNESIUM ALLOYS; ALUMINIUM ALLOYS; ZINC ALLOYS; PRECIPITATION; AGING; TEMPERATURE DEPENDENCE; TRANSMISSION ELECTRON MICROSCOPY

Citation Formats

Celotto, S. TEM study of continuous precipitation in Mg-9 wt%Al-1 wt%Zn alloy[Transmission Electron Microscopy]. United States: N. p., 2000. Web. doi:10.1016/S1359-6454(00)00004-5.
Celotto, S. TEM study of continuous precipitation in Mg-9 wt%Al-1 wt%Zn alloy[Transmission Electron Microscopy]. United States. doi:10.1016/S1359-6454(00)00004-5.
Celotto, S. Thu . "TEM study of continuous precipitation in Mg-9 wt%Al-1 wt%Zn alloy[Transmission Electron Microscopy]". United States. doi:10.1016/S1359-6454(00)00004-5.
@article{osti_20075933,
title = {TEM study of continuous precipitation in Mg-9 wt%Al-1 wt%Zn alloy[Transmission Electron Microscopy]},
author = {Celotto, S.},
abstractNote = {The development of continuous precipitate morphology in heat-treated Mg-9 wt%Al-1 wt%Zn alloy (AZ91) for a range of ageing temperatures is investigated in detail using TEM. The matrix/precipitate orientation relationships (ORs), sizes, shapes and the number of precipitates per unit volume (N{sub V}) are described for ageing at temperatures from 70 to 300 C. Most of the continuous precipitates have a Burgers OR and are plate-shaped with the primary habit plane parallel to the basal plane of the matrix. These precipitates are initially lozenge-shaped plates that elongate with time at temperature to become long laths. Two other smaller populations of precipitates that have ORs different from the Burgers OR are also present. These precipitates are rod-shaped with their long direction either perpendicular to or inclined to the basal plane. The relationship between the continuous precipitate morphology and the hardness response is discussed and comparisons are made with high-strength aluminum alloys.},
doi = {10.1016/S1359-6454(00)00004-5},
journal = {Acta Materialia},
issn = {1359-6454},
number = 8,
volume = 48,
place = {United States},
year = {2000},
month = {5}
}