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Technologies 2017, 5(2), 23; doi:10.3390/technologies5020023

Effect of Heat Treatment on the Microstructure of Mg-4Al-Nd Alloys

1
School of Minerals, Metallurgical and Materials Engineering, Indian Institute of Technology Bhubaneswar, Bhubaneswar 751007, Odisha, India
2
CSIR (Council of Scientific and Industrial Research)-Institute of Minerals and Materials Technology, Bhubaneswar 751013, Odisha, India
*
Author to whom correspondence should be addressed.
Academic Editor: Manoj Gupta
Received: 27 March 2017 / Revised: 17 May 2017 / Accepted: 18 May 2017 / Published: 23 May 2017
(This article belongs to the Section Innovations in Materials Processing)
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Abstract

In the present work, Mg-4Al-xNd (x = 0, 1, 4 wt.%) alloys were prepared by a stir casting method, and the effect of the addition of Neodymium (Nd) as-cast and of heat-treated microstructures was studied. The addition of 1 wt.% Nd preferentially formed the Al2Nd phase and completely suppressed the formation of the intermetallic Mg17Al12 (γ) phase, which was initially present in the base alloy (Mg-4Al alloys). On increasing the Nd percentage from 1 to 4 wt.% in the base alloy, two intermetallic phases, Al2Nd and Al11Nd3, were observed in the microstructure, as higher levels of Nd led to a peritectic reaction between Al and the Al2Nd phase, and part of the Al2Nd transformed into the Al11Nd3 phase. The hardness of the as-cast alloy increased with the Nd content. Thus, the hardness increased from 57.1 ± 4.1 Hv of Mg-4Al to 66.5 ± 2.6 Hv of Mg-4Al-4Nd. It was also found that solutionizing and isothermal aging of alloys containing Nd at 180 °C for 96 h led to the size reduction of Al- and Nd-containing intermetallics without altering their morphologies. Further, it was found that Nd does not have any effect on the aging kinetics of the alloys because all of the alloys with and without Nd attained peak hardness at 24 h of aging time. View Full-Text
Keywords: magnesium alloys; microstructure; Neodymium; intermetallics; Vickers micro hardness magnesium alloys; microstructure; Neodymium; intermetallics; Vickers micro hardness
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Mishra, S.; Chaubey, A.; Mandal, A. Effect of Heat Treatment on the Microstructure of Mg-4Al-Nd Alloys. Technologies 2017, 5, 23.

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