| Mechanical properties and microstructure of as-cast and extruded Mg-（Ce, Nd）-Zn-Zr alloys |
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| 引用本文： | 余琨,黎文献,王日初.Mechanical properties and microstructure of as-cast and extruded Mg-（Ce, Nd）-Zn-Zr alloys[J].中南工业大学学报(英文版),2005,12(5):499-502. |
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| 作者姓名： | 余琨 黎文献 王日初 |
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| 作者单位： | School of Materials Science and Engineering, Central South University, Changsha 410083, China |
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| 摘 要： | 1INTRODUCTION Thebeneficialinfluenceofrareearth(RE)metalsontheambientandelevatedtemperature mechanicalpropertiesofmagnesiumalloyhaslongbeenrecognized13].Recently,Yttriumisaddedto Magnesiumalloytoimproveitstensilestrength andcreepresistance,andsuchinvestigationsatheat resistantmagnesiumalloyhaveledtothede velopmentofWE43andWE54alloys4,5].Al thoughsuchalloysexhibitgoodpropertiesupto573Kthroughcastingandextruding,therelativelyhighcostofYttriumrestrictstheapplicationof suchalloys.Otherr…
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| 关 键 词： | 合金 铸件 机械性能 微观结构 稀土 镁 锌 |
| 文章编号： | 1005-9784（2005）05-0499-04 |
| 收稿时间： | 2004-12-18 |
| 修稿时间： | 2005-01-20 |
Mechanical properties and microstructure of as-cast and extruded Mg-(Ce, Nd)-Zn-Zr alloys |
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| Yu Kun , Li Wen-xian and Wang Ri-chu.Mechanical properties and microstructure of as-cast and extruded Mg-(Ce, Nd)-Zn-Zr alloys[J].Journal of Central South University of Technology,2005,12(5):499-502. |
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| Authors: | Yu Kun Li Wen-xian and Wang Ri-chu |
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| Affiliation: | (1) School of Materials Science and Engineering, Central South University, 410083 Changsha, China |
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| Abstract: | Studies on the mechanical properties and microstructures of as-cast and extruded Mg-Ce-Zn-Zr and Mg-Nd-Zn-Zr alloys have been made before and after heat treatment. The results show that the mechanical properties of as-cast Mg-Ce and Mg-Nd alloys are as good as those of typical die cast AZ91 alloy and the heat resistant WE43 alloy. In Nd-containing alloys, the precipitated phase Mg12Nd contributes significantly to age hardening. The mechanical properties of extruded alloys are improved obviously compared with those of as-cast alloys. The ultimate strength is 257.8 MPa for extruded Mg-Ce alloy and 265.6 MPa for extruded Mg-Nd alloy. Extrusion is a useful method to improve both the strengths and elongations of the two experimental alloys at both ambient and elevated temperatures. The grain refinement and precipitation strengthening are the main strengthening mechanisms in the alloys. Tensile fracture surfaces show a dimple pattern after extruding and therefore reflect an improved elongation. |
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| Keywords: | Mg-(Ce Nd)-Zn-Zr alloy rare earth extrusion |
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