| 铸造Mg-5Zn-0.6Zr-1RE-2Y镁合金的时效硬化和时效析出相 |
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| 引用本文： | 陈敬区,刘江文,焦东玲,罗承萍. 铸造Mg-5Zn-0.6Zr-1RE-2Y镁合金的时效硬化和时效析出相[J]. 金属热处理, 2010, 35(6) |
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| 作者姓名： | 陈敬区 刘江文 焦东玲 罗承萍 |
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| 作者单位： | 华南理工大学材料科学与工程学院,广东广州,510640 |
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| 摘 要： | 通过X射线衍射、光学金相、扫描电镜以及能谱分析、透射电镜等试验手段,对Mg-5Zn-0.6Zr-1RE-2Y合金铸态及固溶时效后的晶界和晶内合金相进行了研究.结果表明,Mg-5Zn-0.6Zr-1RE-2Y合金铸态晶界合金相主要以两种形态出现,一种是在三角晶界形核,呈"鱼骨状";另一种,在晶界呈连续网状分布.XRD及能谱分析表明晶界的"鱼骨状"共晶组织由Mg3Y2Zn3、Mg12YZn和MSZn2组成,而连续网状组织是Mg3Y2Zn3相.该合金经450℃×12 h固溶处理后,晶粒内和晶界处组织特征有所改变.固溶过程中晶界处部分组织溶解,使固溶处理后晶界组织明显纤细和均匀.经200℃时效处理后,晶内析出Mg3Y2Zn3、MgZn和MgZ2:相,且随时效时间的延长,Mg3Y2Zn3和MgZn相的含量逐渐增多,至8 h时达到最高,而MgZn2相逐渐减少.杆(块)状Mg3Y2Zn3析出相(尺寸大小约为100～300 nm)和针(棒)状的Mgzn析出相(长约100～200 nm)是Mg-SZn-0.6Zr-1RE-2Y镁合金时效强化的两个主要特点.
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| 关 键 词： | Mg-Zn系合金 固溶处理 时效硬化 析出相 |
Precipitates and aging hardening of cast Mg-5Zn-0. 6Zr-1RE-2Y magnesium alloy |
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| CHEN Jing-qu,LIU Jiang-wen,JIAO Dong-ling,LUO Cheng-ping. Precipitates and aging hardening of cast Mg-5Zn-0. 6Zr-1RE-2Y magnesium alloy[J]. Heat Treatment of Metals, 2010, 35(6) |
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| Authors: | CHEN Jing-qu LIU Jiang-wen JIAO Dong-ling LUO Cheng-ping |
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| Affiliation: | CHEN Jing-qu,LIU Jiang-wen,JIAO Dong-ling,LUO Cheng-ping(School of Materials Science and Engineering,South China University of Technology,Guangzhou Guangdong 510640,China) |
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| Abstract: | Alloy phases of the as-cast,solution treated and aged Mg-5Zn-0.6Zr-1RE-2Y magnesium alloy were studied by means of X-ray diffraction analysis(XRD),optical microscopy(OM),scanning electron microscopy(SEM),energy spectrum analysis(EDS),and transmission electron microscopy(TEM).The results indicated that there were two kinds of the alloy phases along grain boundary of the as-cast Mg-5Zn-0.6Zr-1RE-2Y alloy.The ones nucleated and grew at triangular grain boundary,which were fish-bone-like eutectic and were compo... |
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| Keywords: | Mg-Zn alloys solution treatment aging hardening precipitates |
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