The influence of Mg₁₇Al₁₂ phase volume fraction on the corrosion behaviour of AZ91 magnesium alloy
by Andrzej Kielbus, Grzegorz Moskal
International Journal of Microstructure and Materials Properties (IJMMP), Vol. 4, No. 2, 2009

Abstract: The microstructure and the corrosion behaviour of AZ91 magnesium alloy in the as-cast and after heat treatment conditions were investigated. The microstructure of the cast alloy consisted of an α-Mg phase matrix with a continuous and discontinuous β phase (Mg₁₇Al₁₂) at the grain boundaries. The β phase had a twofold influence on corrosion: as a barrier (high volume fraction) and as a galvanic cathode (small volume fraction). After the T4 treatment, the β phase dissolved in the matrix and after the T6 treatment, discontinuous precipitation of the β phase along the grain boundaries was observed. The microstructural examinations were conducted using light microscopy. The corrosion behaviour was investigated in a 3.5% solution of NaCl. The aim of this paper is to present the results of investigations on the microstructure of the AZ91 magnesium alloy after heat treatment.

Online publication date: Mon, 21-Sep-2009

The full text of this article is only available to individual subscribers or to users at subscribing institutions.

 
Existing subscribers:
Go to Inderscience Online Journals to access the Full Text of this article.

Pay per view:
If you are not a subscriber and you just want to read the full contents of this article, buy online access here.

Complimentary Subscribers, Editors or Members of the Editorial Board of the International Journal of Microstructure and Materials Properties (IJMMP):
Login with your Inderscience username and password:

Username:        Password:          Forgotten your password?

Want to subscribe?
A subscription gives you complete access to all articles in the current issue, as well as to all articles in the previous three years (where applicable). See our Orders page to subscribe.

If you still need assistance, please email subs@inderscience.com