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| 铈镧混合稀土对AZ91D压铸镁合金显微组织和蠕变性能的影响 | |
| 引用本文： | 张德平,田政,唐定骧,孟健,L.L.Rokhlin,T.V.Dobatkina.铈镧混合稀土对AZ91D压铸镁合金显微组织和蠕变性能的影响[J].稀有金属,2010,34(2). |
| 作者姓名： | 张德平 田政 唐定骧 孟健 L.L.Rokhlin T.V.Dobatkina |
| 作者单位： | 1. 中国科学院长春应用化学研究所稀土资源利用国家重点实验室,吉林,长春,130022 2. 中科希美镁业有限责任公司,吉林,长春,130025 3. Baikov Institute of Metallurgy and Materials Science,Russian Academy of Sciences,Moscow |
| 基金项目： | 国家高技术研究发展计划863项目，国际科技合作项目 |
| 摘 要： | 研究了不同含量Ce/La(x=0,0.1,0.5,1.0)对AZ91D镁合金显微组织及蠕变性能的影响。通过X射线衍射(XRD)、金相显微镜(OM)、扫描电镜(SEM)及能谱分析(EDX)观察与分析表明,压铸AZ91D镁合金中添加Ce/La后,除了α-Mg,β-Mg17Al12相之外,还生成了新的稀土化合物Al11RE3(RE=Ce/La)化合物,并且细化了合金显微组织、提高了合金室温和高温力学性能。生成的Al11RE3(RE=Ce/La)高温热稳定相使AZ91D+xCe/La(x=0,0.1,0.5,1.0)合金在150℃,50MPa下的蠕变抗力优于AZ91D镁合金,1%Ce/La的合金与AZ91D相比,蠕变延伸率低了0.2%,最小蠕变速率从2.30×10-8s-1降低到2.02×10-8s-1。蠕变试样的微观组织结构分析表明:AZ91D合金的蠕变机制主要以晶界滑移方式为主,Al11RE3(RE=Ce/La)热稳定相在晶界处延缓和阻碍了晶界断裂的过程。 |
| 关 键 词： | AZ91D镁合金 晶粒细化 抗蠕变性能 显微组织 铈镧混合稀土 |
Effect of Ce/La on Microstructure and Creep Property of Die-Cast AZ91D Alloys |
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| Zhang Deping,Tian Zheng,Tang Dingxiang,Meng Jian,Rokhlin L. L.,Dobatkina T. V..Effect of Ce/La on Microstructure and Creep Property of Die-Cast AZ91D Alloys[J].Chinese Journal of Rare Metals,2010,34(2). | |
| Authors: | Zhang Deping Tian Zheng Tang Dingxiang Meng Jian Rokhlin L L Dobatkina T V |
| Affiliation: | Zhang Deping1,Tian Zheng2,Tang Dingxiang1,Meng Jian1,Rokhlin L.L.3,Dobatkina T.V.3(1.State Key Laboratory of Rare Earth Resources Application,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,China,2.Changchun Seemay Magnesiumco.,LTD,Changchun 130025,3.Baikov Institute of Metallurgy , Materials Science,Russian Academy of Sciences,Moscow) |
| Abstract: | The effect of Ce/La on the microstructures and creep property of die-cast AZ91D alloys containing varied contents of Ce/ La (0%, 0. 1%, 0.5%, 1.0% ) was studied. X-ray diffraction, optical microscopy, scanning electron microscopy and energy dis-perse spectroscopy were used to analyze microstructures and creep properties of the alloys at room temperature and high temperature. Results showed that the new phase compositions of die-cast AZ91D alloys adding in a small amount of Ce/La mainly consisted of β-Mg_(17)Al_(12) and Al_(11) RE_3 ( RE = Ce/La) phases. It not only refined the microstructure and improved mechanical properties of alloy but al-so improved the creep resistant properties of alloy. Compared 1% Ce/La with AZ91D, the total strain of alloy decreased 0.2% and the minimum creep rate decreased from 2.30 × 10~(-8)s~(-1) to 2.02 × 10~(-8) s~(-1). The creep resistant of the alloy with the heat-resistant phases was superior to that of AZ91D alloy. The results indicated that the creep mechanism of AZ91D alloy was the grain boundary sliding and the heat-resistant phases postponed the process of creep resistant and improved the creep resistant properties of AZ91D alloy. |
| Keywords: | AZ91D grain refinement creep resistance microstructure Ce/La misch metal |
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