| 大挤压形变AZ91 D镁合金半固态等温组织演变 |
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| 引用本文： | 夏明许,郑红星,袁森,李建国.大挤压形变AZ91 D镁合金半固态等温组织演变[J].材料科学与工艺,2005,13(3):287-290. |
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| 作者姓名： | 夏明许 郑红星 袁森 李建国 |
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| 作者单位： | 1. 上海交通大学,材料科学与工程学院,上海,200030
2. 西安理工大学,材料科学与工程学院,西安,710048 |
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| 摘 要： | 通过液淬法获得挤压比为40的AZ91D镁合金等温处理过程中的半固态组织,研究其球化机制.结果表明:密集位错促使再结晶速度加快,球化时间缩短.球化机制为等温过程中再结晶导致形变组织粒化,晶界低熔点组份聚集处以及位错密度相对较高的区域熔化,形成蜂巢状组织;固液界面张力和曲率过热促使多边形晶粒进一步球化.
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| 关 键 词： | SIMA 曲率过热 固液界面张力 球化机制 |
| 文章编号： | 1005-0299(2005)03-0287-04 |
| 修稿时间： | 2004年2月20日 |
Microstructural evolution of highly extruded AZ91D magnesium alloys |
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| XIA Ming-xu,ZHENG Hong-xing,Yuan Sen,LI Jian-guo.Microstructural evolution of highly extruded AZ91D magnesium alloys[J].Materials Science and Technology,2005,13(3):287-290. |
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| Authors: | XIA Ming-xu ZHENG Hong-xing Yuan Sen LI Jian-guo |
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| Abstract: | Microstructural spheroidization of extruded AZ91D magnesium alloys with a high extrusion ratio of 40 was investigated at semisolid state. It shows that the recrystallization accelerated by intensive dislocations and the spheroidization time shortened. The mechanism of spheroidization was that the globalization of preformed structure was result in by recrystallization and cells microstructures formed in the places where the low melting point composition and the high density dislocation aggregated, and then solid-liquid tension and curvatural overheating strengthened the spheroidization of polygon grains. |
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| Keywords: | SIMA curvatural overheating solid-liquid boundary tension spheroidization mechanism |
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