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2222材料工程  2021, Vol. 49 Issue (2): 79-87    DOI: 10.11868/j.issn.1001-4381.2020.000085
  研究论文 本期目录 | 过刊浏览 | 高级检索 |
形变热处理工艺对2519A铝合金动态变形行为的影响
孙大翔1,2, 董宇2, 叶凌英2, 唐建国2
1. 广东省工业分析检测中心, 广州 510650;
2. 中南大学 材料科学与工程学院, 长沙 410083
Effect of thermo-mechanical treatments on dynamic deformation behaviors of 2519A aluminum alloy
SUN Da-xiang1,2, DONG Yu2, YE Ling-ying2, TANG Jian-guo2
1. Guangdong Industrial Analysis and Testing Center, Guangzhou 510650, China;
2. School of Materials Science and Engineering, Central South University, Changsha 410083, China
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摘要 通过霍普金森压杆实验研究2519A铝合金T87,T8,T9和T9I6 4种形变热处理状态在1040~5900 s-1应变率范围的动态冲击变形行为,并利用金相、透射电镜等手段分析在动态变形中合金微观组织的演变规律,研究不同形变热处理工艺对2519A铝合金动态变形行为的影响。结果表明:与T87态合金相比,强冷变形的T8和T9态合金高速冲击的动态屈服强度大幅提升,但是合金的绝热剪切敏感性也显著增加,更容易发生绝热剪切开裂。断续时效T9I6工艺可以提高2519A合金强化析出相的密度,使θ'相(Al2Cu)更细小弥散分布。这样降低了θ'析出相在高应变率下被位错切割分解的速率,提高合金在高速变形过程中的稳定性。2519A-T9I6铝合金在高应变率下拥有较高的动态屈服强度和较低的绝热剪切敏感性,在高速变形过程中表现最佳。
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孙大翔
董宇
叶凌英
唐建国
关键词 2519A铝合金形变热处理高应变率动态屈服强度绝热剪切敏感性θ'析出相    
Abstract:The dynamic deformation behaviors of 2519A aluminum alloy treated by T87, T8, T9 and T9I6 were investigated by the split Hopkinson pressure bar in the strain rate range of 1040-5900 s-1, and the microstructure evolution of the alloys during high velocity impact were analyzed by means of metallography and transmission electron microscopy, the effect of different thermo-mechanical treatments on dynamic responses of aluminum alloy 2519A was revealed. The results show that the dynamic yield strength of 2519A-T8 or T9 aluminum alloy is increased significantly than T87 treated alloy, but the adiabatic shear susceptibility is dramatically improved. Interrupted aging T9I6 can improve θ' (Al2Cu) precipitates density and make them much finer and denser, which reduce the decomposition rate of θ' precipitates and enhance its stability at high strain rate. So 2519A-T9I6 aluminum alloy has much higher dynamic yield strength, and lower adiabatic shear susceptibility, which shows best performance at high strain rate.
Key words2519A aluminum alloy    thermo-mechanical treatment    high strain rate    dynamic yield strength    adiabatic shear susceptibility    θ' precipitate
收稿日期: 2020-02-01      出版日期: 2021-02-27
中图分类号:  TG146.21  
基金资助:广东省科学院实施创新驱动发展能力建设专项资金项目(2018GDASCX-0954);广州市对外科技合作计划项目(201907010004);广东省自然科学基金(2018A030310417);2020年广东省省属科研机构改革创新领域稳定支持
通讯作者: 孙大翔(1984-),男,工程师,博士,研究方向:高性能铝合金制备与表征,金属材料失效分析,联系地址:广州市天河区长兴路363号广东省工业分析检测中心(510650),E-mail:18802081724@163.com     E-mail: 18802081724@163.com
引用本文:   
孙大翔, 董宇, 叶凌英, 唐建国. 形变热处理工艺对2519A铝合金动态变形行为的影响[J]. 材料工程, 2021, 49(2): 79-87.
SUN Da-xiang, DONG Yu, YE Ling-ying, TANG Jian-guo. Effect of thermo-mechanical treatments on dynamic deformation behaviors of 2519A aluminum alloy. Journal of Materials Engineering, 2021, 49(2): 79-87.
链接本文:  
http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2020.000085      或      http://jme.biam.ac.cn/CN/Y2021/V49/I2/79
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