Effects of Nd on microstructures and properties at the elevated temperature of a Mg-0.3Zn-0.32Zr alloy

Ning, Z. L. and Wang, H. and Liu, H. H. and Cao, F. Y. and Wang, S. T. and Sun, J. F. (2010) Effects of Nd on microstructures and properties at the elevated temperature of a Mg-0.3Zn-0.32Zr alloy. Materials and Design, 31 (9). pp. 4438-4444. ISSN 0264-1275

Abstract

The effects of Nd addition on the microstructures and mechanical properties at elevated temperatures of a Mg–0.3Zn–0.32Zr alloy were investigated in this study. The grain sizes of Mg–0.3Zn–0.32Zr alloys were decreased from 120 lm to 76 lm and grain morphologies were changed from hexahedron to rosette-like by increasing Nd addition from 0.21% to 2.65%. Both Nd and Zn are fully dissolved into the Mg matrix when Nd addition is less than 0.84% and the as-cast structure consists of only a-Mg. Increasing Nd concentration over 1.62%, intermetalitics Mg12(Nd,Zn) phase confirmed by X-ray diffractometer (XRD) occurs at the grain boundaries and triple grain boundaries. The heat treatment results in the Nd fully dissolved and then re-precipitated as Mg12(Nd,Zn), distributing as cluster within the grains and along the grain boundaries. The heat treatment also results in some grain coarsening, and Nd acts as effective barriers for the grain agglomeration. The existing of Mg12(Nd,Zn) phase within the grains and along the grain boundaries for the alloys containing high Nd acts to lock the grain boundaries and reduce grain boundary and dislocation sliding, leading to obvious improvements both in tensile strength and yield strength as well as a slight decrease in elongation at elevated temperatures.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Author version not held.
Depositing User: Dr Hao Wang
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - Department of Mechanical and Mechatronic Engineering
Date Deposited: 28 Mar 2011 07:51
Last Modified: 03 Jul 2013 00:32
Uncontrolled Keywords: alloys; as-cast; dislocation sliding; elevated temperature; grain coarsening; grain morphologies; grain size; Mg matrix; microstructures and mechanical properties; Nd addition; X ray diffractometers; yield strength
Fields of Research (FOR2008): 09 Engineering > 0912 Materials Engineering > 091207 Metals and Alloy Materials
09 Engineering > 0915 Interdisciplinary Engineering > 091502 Computational Heat Transfer
09 Engineering > 0912 Materials Engineering > 091205 Functional Materials
Socio-Economic Objective (SEO2008): E Expanding Knowledge > 97 Expanding Knowledge > 970109 Expanding Knowledge in Engineering
B Economic Development > 86 Manufacturing > 8612 Fabricated Metal Products > 861203 Metal Castings
Identification Number or DOI: doi: 10.1016/j.matdes.2010.04.021
URI: http://eprints.usq.edu.au/id/eprint/18591

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