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yousefi parchin oliya, A., Azadi, M., Mokhtari Shirazabad, M. (2022). Sensitivity Analysis of Ageing Parameters on Properties of AZ91 Magnesium Alloy by Regression Method. , 33(1), 49-70. doi: 10.22067/jmme.2021.70587.1016
Ahmad yousefi parchin oliya; Mohammad Azadi; Mehdi Mokhtari Shirazabad. "Sensitivity Analysis of Ageing Parameters on Properties of AZ91 Magnesium Alloy by Regression Method". , 33, 1, 2022, 49-70. doi: 10.22067/jmme.2021.70587.1016
yousefi parchin oliya, A., Azadi, M., Mokhtari Shirazabad, M. (2022). 'Sensitivity Analysis of Ageing Parameters on Properties of AZ91 Magnesium Alloy by Regression Method', , 33(1), pp. 49-70. doi: 10.22067/jmme.2021.70587.1016
yousefi parchin oliya, A., Azadi, M., Mokhtari Shirazabad, M. Sensitivity Analysis of Ageing Parameters on Properties of AZ91 Magnesium Alloy by Regression Method. , 2022; 33(1): 49-70. doi: 10.22067/jmme.2021.70587.1016

Sensitivity Analysis of Ageing Parameters on Properties of AZ91 Magnesium Alloy by Regression Method

مهندسی متالورژی و مواد
Article 4, Volume 33, Issue 1 - Serial Number 25, May 2021, Pages 49-70    PDF (1.4 M)
Document Type: Original Article
DOI: 10.22067/jmme.2021.70587.1016
Authors
Ahmad yousefi parchin oliya1; Mohammad Azadi* 2; Mehdi Mokhtari Shirazabad3
1Department of Aerospace - Aeronautical Structures / Faculty of Modern Sciences and Technologies Campus / Semnan State University / Semnan / Iran
2Faculty of Mechanical Engineering, Semnan University, Semnan, Iran.
3Department of Mechanical Engineering, University of Bristol, Bristol, United Kingdom.
Abstract
In this article, the effects of the ageing temperature and the ageing time in the heat treatment have been investigated on the hardness and the microstructure of AZ91 and AZ91+1%RE magnesium alloys, using the sensitivity analysis with the Minitab software. For this purpose, 8 ageing treatments with different temperatures and times were performed on AZ91 and AZ91+1%RE magnesium alloys and then, results related to the Brinell hardness and the microstructure of the optical microscopy, were compared. Based on results of the sensitivity analysis, the influence of the ageing temperature on hardness increasing was more than the ageing time. Moreover, ageing at 215°C and 3 hours enhanced the hardness of the AZ91 magnesium alloy about 57% and ageing at 215°C and 5 hours increased the hardness of the AZ91+1%RE magnesium alloy about 47%. In addition, ageing converted a large part of continuous precipitations to needle-shaped precipitations on the alpha phase and also reduced the amount of precipitations around the Mg17Al12 phase in the microstructure of both alloys.
Keywords
Hardness; Ageing temperature; Ageing time; Microstructure; Magnesium alloy
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