Microstructure and properties of Mg-Nd-Zn-Zr alloys
Paper
Paper/Presentation Title | Microstructure and properties of Mg-Nd-Zn-Zr alloys |
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Presentation Type | Paper |
Authors | Wang, H. (Author), Ning, Z. L. (Author), Liang, W. Z. (Author), Cao, F. Y. (Author) and Sun, J. F. (Author) |
Journal or Proceedings Title | Proceedings of the International Conference and Exhibition on Materials and AustCeram (MA 2009) |
Number of Pages | 8 |
Year | 2010 |
Place of Publication | Melbourne, Australia |
Conference/Event | 2009 International Conference and Exhibition on Materials and AustCeram (MA 2009) |
Event Details | 2009 International Conference and Exhibition on Materials and AustCeram (MA 2009) Event Date 01 to end of 03 Jul 2009 Event Location Gold Coast, Australia |
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 μm to 75 μm. 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 Mg 12Nd intermetallic phase at grain boundaries. The Nd-contained materials undergo a T6 heat treatment with a solution treatment at 530°C for 8 hours followed by an aging at 250°C 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. This Mg12Nd precipitation significantly increases the mechanical properties of the materials, especially the high temperature properties. The 200°C tensile strength is 120 MPa for 0.2% Nd-contained alloy and 200 MPa at 2.6% Nd. Even at a higher temperature, 300°C, 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. |
Keywords | creep strengths; elevated temperature; grain coarsening; intermetallic phase; Mg-Nd-Zn-Zr alloys; microstructure and properties; solution treatments; T6 heat treatment |
ANZSRC Field of Research 2020 | 340205. Main group metal chemistry |
401607. Metals and alloy materials | |
401205. Experimental methods in fluid flow, heat and mass transfer | |
Public Notes | © Institute of Materials Engineering Australasia Ltd. No evidence of copyright restrictions preventing deposit of Accepted Version. |
Byline Affiliations | Department of Mechanical and Mechatronic Engineering |
Harbin Institute of Technology, China | |
Heilongjiang Institute of Science and Technology, China | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q28y2/microstructure-and-properties-of-mg-nd-zn-zr-alloys
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