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材料工程  2016, Vol. 44 Issue (1): 47-53    DOI: 10.11868/j.issn.1001-4381.2016.01.007
  材料与工艺 本期目录 | 过刊浏览 | 高级检索 |
变形条件对2519A铝合金动态力学性能与组织演化的影响
刘文辉1,2, 何圳涛1,2, 唐昌平1,2, 陈宇强1,2
1. 湖南科技大学机电工程学院, 湖南湘潭 411201;
2. 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
Effect of Deformation Condition on Dynamic Mechanical Properties and Microstructure Evolution of 2519A Aluminum Alloy
LIU Wen-hui1,2, HE Zhen-tao1,2, TANG Chang-ping1,2, CHEN Yu-qiang1,2
1. College of Mechanical and Electrical Engineering, Hunan University of Science and Technology, Xiangtan 411201, Hunan, China;
2. Key Laboratory of High Temperature Wear Resistant Materials and Preparation Technology of Hunan Province, Hunan University of Science and Technology, Xiangtan 411201, Hunan, China
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摘要 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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刘文辉
何圳涛
唐昌平
陈宇强
关键词 2519A铝合金绝热剪切带动态力学性能裂纹    
Abstract:To study the effect of temperature and strain rate on the dynamic mechanical properties and microstructure evolution of 2519A aluminum alloy, the dynamic mechanical properties of 2519A aluminum 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 appear within the ASBs, and some long strip particles are broken by brittle fracture.
Key words2519A aluminum alloy    ASB    dynamic mechanical property    crack
收稿日期: 2014-08-11      出版日期: 2016-01-20
中图分类号:  TG146.2+1  
通讯作者: 刘文辉(1978-),男,博士,副教授,主要从事轻合金加工工艺与性能、损伤疲劳与断裂等方面的研究工作,联系地址:湖南省湘潭市雨湖区桃园路湖南科技大学机电工程学院(411201)     E-mail: lwh@hnust.edu.cn
引用本文:   
刘文辉, 何圳涛, 唐昌平, 陈宇强. 变形条件对2519A铝合金动态力学性能与组织演化的影响[J]. 材料工程, 2016, 44(1): 47-53.
LIU Wen-hui, HE Zhen-tao, TANG Chang-ping, CHEN Yu-qiang. Effect of Deformation Condition on Dynamic Mechanical Properties and Microstructure Evolution of 2519A Aluminum Alloy. Journal of Materials Engineering, 2016, 44(1): 47-53.
链接本文:  
http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2016.01.007      或      http://jme.biam.ac.cn/CN/Y2016/V44/I1/47
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