Influence of Higher Zn/Y Ratio on the Microstructure and Mechanical Properties of Mg-Zn-Y-Zr Alloys
文献类型：期刊论文
| 作者 | D. K. Xu ; E. H. Han ; L. Liu ; Y. B. Xu |
| 刊名 | Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science
 |
| 出版日期 | 2009 |
| 卷号 | 40A期号:7页码:1727-1740 |
| 关键词 | metal-matrix composites quasi-crystalline particles icosahedral phase strengthening mechanisms solidification behavior magnesium fatigue diagram systems |
| ISSN号 | 1073-5623 |
| 中文摘要 | This work mainly investigated the microstructure and mechanical properties of Mg-Zn-Y-Zr alloys with Zn/Y ratios of 5 and 10. An X-ray diffraction (XRD) analysis indicated that the two alloys were mainly composed of an icosahedral phase (I-phase) and alpha-Mg matrix. For the alloy with a Zn/Y ratio of 10, however, the diffraction peaks of the I-phase were stronger. Microstructure observation showed that the I-phase preferentially existed in the form of I-phase/alpha-Mg matrix interdendritic eutectic pockets at grain boundaries. Moreover, when the Zn/Y ratio was increased 2 times, the volume fraction of the I-phase in the alpha-Mg matrix increased 1.5 times and a tiny Mg(7)Zn(3) phase formed. Energy-dispersive spectroscopy (EDS) mapping and electron probe microanalysis (EPMA) results suggested that the chemical composition of the I-phase was not a constant value. Computer-aided cooling curve analysis (CA-CCA) indicated that, for the alloy with a Zn/Y ratio of 5, formation of the I-phase relied on the W-phase transformation and the eutectic reaction of the residual melt. However, the I-phase formation for the alloy with a Zn/Y ratio of 10 depended on the eutectic reaction of the melt. Tensile tests indicated that the mechanical properties of the two as-cast alloys were poor. After hot extrusion processing, the mechanical properties of the alloy with a Zn/Y ratio of 10 were noticeably increased. The ultimate tensile strength (UTS) and elongation to failure reached 320 MPa and 13 pct, respectively. |
| 原文出处 | |
| 公开日期 | 2012-04-13 |
| 源URL | [http://210.72.142.130/handle/321006/32456]  |
| 专题 | 金属研究所_中国科学院金属研究所 |
| 推荐引用方式 GB/T 7714 | D. K. Xu,E. H. Han,L. Liu,et al. Influence of Higher Zn/Y Ratio on the Microstructure and Mechanical Properties of Mg-Zn-Y-Zr Alloys[J]. Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science,2009,40A(7):1727-1740. |
| APA | D. K. Xu,E. H. Han,L. Liu,&Y. B. Xu.(2009).Influence of Higher Zn/Y Ratio on the Microstructure and Mechanical Properties of Mg-Zn-Y-Zr Alloys.Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science,40A(7),1727-1740. |
| MLA | D. K. Xu,et al."Influence of Higher Zn/Y Ratio on the Microstructure and Mechanical Properties of Mg-Zn-Y-Zr Alloys".Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science 40A.7(2009):1727-1740. |
入库方式： OAI收割
来源：金属研究所
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