Microstructure and properties of Mg-Nd-Zn-Zr alloys

Wang, Hao and Ning, Zhiliang and Liang, W. Z. and Cao, Fuyang and Sun, Jianfei (2009) Microstructure and properties of Mg-Nd-Zn-Zr alloys. In: 4th International Light Metals Technology Biennial Conference (LMT2009), 29 June - 1 July 2009, Gold Coast, Australia.

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Abstract

[Abstract]: One of the limitations of magnesium alloys is their low mechanical properties at elevated temperatures. In order to improve the creep strength, rare earth element neodymium Nd is added to Mg-0.3Zn-0.32Zr alloy. A significant grain refinement has already been achieved by the Zr addition in the base metal. The inclusion of Nd further reduces grain size from 120 m to 75 m. When the Nd content is less than 1%, the Nd is fully dissolved into Mg matrix. Increasing the Nd addition to 1.6% leads to a precipitation of Mg12Nd intermetallic phase at grain boundaries. The Nd-contained materials undergo a T6 heat treatment with a solution treatment at 530ºC for 8 hours followed by an aging at 250ºC for 12 hours. The heat treatment results in the Nd fully dissolved and then re-precipitated as Mg12Nd, distributing as cluster within the grains and along the grain boundaries. These Mg12Nd precipitation significantly increases the mechanical properties of the materials, especially the high temperature properties. The 200ºC tensile strength is 120 MPa for 0.2% Nd-contained alloy and 200 MPa at 2.6% Nd. Even at a higher temperature, 300ºC, the Nd-contained alloys still retain significant strength, 60MPa for 0.2% Nd alloy and 110 MPa for 2.6% Nd alloy. The heat treatment also results in some grain coarsening, and Nd acts as effective barriers for the grain agglomeration


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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Paper)
Refereed: Yes
Item Status: Live Archive
Additional Information: Author version deposited in accordance with the copyright policy of the publisher (Trans Tech). Held prior to International Conference and Exhibition on Materials and AustCeram (MA2009).
Depositing User: Dr Hao Wang
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - Department of Mechanical and Mechatronic Engineering
Date Deposited: 23 Sep 2010 01:37
Last Modified: 02 Jul 2013 23:55
Uncontrolled Keywords: magnesium alloys; strengthening; heat
Fields of Research (FOR2008): 03 Chemical Sciences > 0303 Macromolecular and Materials Chemistry > 030307 Theory and Design of Materials
09 Engineering > 0912 Materials Engineering > 091207 Metals and Alloy Materials
09 Engineering > 0915 Interdisciplinary Engineering > 091502 Computational Heat Transfer
Socio-Economic Objective (SEO2008): B Economic Development > 86 Manufacturing > 8612 Fabricated Metal Products > 861206 Structural Metal Products
URI: http://eprints.usq.edu.au/id/eprint/8209

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