Journal ArticleDOI
An electron microscope investigation of the microstructure in an aluminium-zinc-magnesium alloy
J. Gjønnes,Chr.J. Simensen +1 more
TLDR
In this paper, the microstructure of the precipitates in an Al(Zn, Mg) alloy after age hardening has been studied by means of electron microscopy.About:
This article is published in Acta Metallurgica.The article was published on 1970-08-01. It has received 222 citations till now. The article focuses on the topics: Microstructure & Alloy.read more
Citations
More filters
Journal ArticleDOI
Analysis of precipitate density of an aluminium alloy by TEM and AFM
Abstract: The quantification of nanometric precipitates in Al-Zn-Mg-Cu alloys has been performed by a series of experimental techniques. Especially in the AA7050 alloy, after ageing heat treatment, the particles responsible for the hardening become very thin. Typically, these precipitates of nanometric sizes are mainly characterized by transmission electron microscopy (TEM), which in this particular case, requires a very meticulous preparation. This study investigated a possible alternative quantification of the precipitates by atomic force microscopy (AFM) to complement the technique by TEM. For this, three conditions for heat treatment of an aged aluminium alloy AA7050 were therefore chosen to produce different density and sizes of precipitates. The experimental results showed that the AFM technique proved to be a valid qualitative tool and may complement the results obtained by TEM an exploratory analysis for the microstructures.
Journal ArticleDOI
On the intergranular fracture mechanism due to ledge formation in an Al-6.0% Zn-2.5% Mg alloy
Takeshi Kawabata,Osamu Izumi +1 more
TL;DR: In this paper, the ledges observed on the over-load fracture surfaces of an Al-60% Zn-25% Mg alloy variously heat treated are discussed and the fracture stress, calculated from a modified equation of Stroh's theory, supports the possibility of fracture occurring at a stress beyond yielding.
Book ChapterDOI
Precipitation and solute clustering in aluminium: advanced characterisation techniques
TL;DR: In this article, the effect of solute clustering and micro-alloying on precipitate microstructure evolution in aluminium alloys is discussed. And a brief review is given on the effects of severe plastic deformation on the precipitate evolution in Al alloys.
Journal ArticleDOI
The direct observation of copper segregation at the broad faces of η′ and η precipitates in AA7010 aluminium alloy
TL;DR: In this article, the composition of strengthening precipitates has been studied at the atomic scale in microstructures of commercially processed AA7010 alloy in the standard over-aged temper state.
Journal ArticleDOI
Self-accommodated defect structures modifying the growth of Laves phase
TL;DR: In this paper, the authors reported the coexistence of C14, C36 and C15 structures in MgZn2 precipitates by using atomic resolution scanning transmission electron microscopy.
References
More filters
Journal ArticleDOI
The nucleation of precipitates: The system Al-Zn-Mg
TL;DR: In this article, a semiquantitative theory has been developed for the formation of precipitate free zones at grain boundaries and the results have been used to develop a model of nucleation by vacancy/solute atom clusters.
Related Papers (5)
HREM study and structure modeling of the η′ phase, the hardening precipitates in commercial Al–Zn–Mg alloys
Microstructures of the commercial 7075 Al alloy in the T651 and T7 tempers
J. K. Park,Alan J. Ardell +1 more