变形条件对2519A铝合金动态力学性能与组织演化的影响
为研究温度与应变率对2519A铝合金动态力学行为及组织演化的影响,采用霍普金森压杆对2519A铝合金进行了不同温度(-90-350℃)、不同应变率下的动态冲击压缩实验,分析了该合金的动态力学性能,并结合金相显微镜与透射电镜对合金在冲击变形后的微观组织进行分析。结果表明:在250-350℃的高温环境冲击下,合金的流变应力迅速下降,组织以形变带为主,同时组织内伴随有明显的动态回复和动态再结晶。在20-150℃的环境中进行动态冲击,合金变形时组织出现了典型的绝热剪切带特征。在室温、应变率达到8200s-1时,应变率强化效果发生转变。随着温度降至-90℃,在绝热剪切带内的组织出现了长度较短、连续性差的...
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          | Published in | 材料工程 Vol. 44; no. 1; pp. 47 - 53 | 
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| Main Author | |
| Format | Journal Article | 
| Language | Chinese | 
| Published | 
            湖南科技大学高温耐磨材料及制备技术湖南省国防科技重点实验室,湖南湘潭411201
    
        2016
     湖南科技大学机电工程学院,湖南湘潭411201  | 
| Subjects | |
| Online Access | Get full text | 
| ISSN | 1001-4381 1001-4381  | 
| DOI | 10.11868/j.issn.1001-4381.2016.01.007 | 
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| Summary: | 为研究温度与应变率对2519A铝合金动态力学行为及组织演化的影响,采用霍普金森压杆对2519A铝合金进行了不同温度(-90-350℃)、不同应变率下的动态冲击压缩实验,分析了该合金的动态力学性能,并结合金相显微镜与透射电镜对合金在冲击变形后的微观组织进行分析。结果表明:在250-350℃的高温环境冲击下,合金的流变应力迅速下降,组织以形变带为主,同时组织内伴随有明显的动态回复和动态再结晶。在20-150℃的环境中进行动态冲击,合金变形时组织出现了典型的绝热剪切带特征。在室温、应变率达到8200s-1时,应变率强化效果发生转变。随着温度降至-90℃,在绝热剪切带内的组织出现了长度较短、连续性差的微裂纹,同时组织内的长条状第二相粒子发生不同程度的脆性断裂。 | 
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| Bibliography: | 11-1800/TB To study the effect of temperature and strain rate on the dynamic mechanical properties and microstructure evolution of 2519 Aaluminum alloy,the dynamic mechanical properties of 2519 Aaluminum alloy were measured by dynamic impact compression tests using the split Hopkinson pressure bar at different temperatures(-90-350℃)and different strain rates.The dynamic mechanical properties were analyzed,and the microstructure after impact was also investigated by metallographic microscope and transmission electron microscopy(TEM).The results show that the impact flow stress decreases rapidly at 250-350℃.The deformation band is the main deformation character,and obvious dynamic recovery and dynamic recrystallization are generated,so the dislocation density is low.Adiabatic shear band(ASB)occurs when the alloy deforms after dynamic impact at 20-150℃.The strain rate strengthening effect changes at room temperature with strain rate 8200s-1.When temperature drops to-90℃,some short and discontinuous microcracks ap  | 
| ISSN: | 1001-4381 1001-4381  | 
| DOI: | 10.11868/j.issn.1001-4381.2016.01.007 |