采用分离式霍布金森(SHPB)压杆装置进行2519A-T87铝合金动态压缩试验,获得温度T为293、423、573、723 K,名义应变速率为(1250±100)、(2400±100)、(5600±220)、(7050±100) s-1条件下2519A铝合金动态屈服应力σs-T关系曲线,并利用TEM对293和723 K 2个温度条件下压缩试样中析出相演变进行显微组织观察.分析研究了不同条件下T对试样σs和微观组织的影响规律.结果表明:在573 K, 5610 s-1下2519A铝合金经受高应变速率冲击后组织中出现明显的绝热剪切带组织.由于2519A铝合金材料具有动态应变时效特性,导致Portevin-Le Chatelier效应产生.当加载T一定时, 越高,冲击后材料内部位错密度越高,致使σs越高;当加载一定时,加载T越高,材料软化效应越明显,σs下降越显著.高条件下,材料的显微组织产生显著变化,θ'析出相增厚效应严重,在723 K下为5380 s-1冲击时,θ'析出相部分会转变为长方体状相;当达到6950 s-1时,θ'析出相完全转变为不共格相.
参考文献
| [1] | 李慧中,张新明,陈明安,周卓平.2519铝合金热变形流变行为[J].中国有色金属学报,2005(04):621-625. |
| [2] | Meng H et al.[J].International Journal of Impact Engineering,2003,28(05):537. |
| [3] | Li Qiang;Xu Yongbo;M. N. Bassim .Dynamic mechanical properties in relation to adiabatic shear band formation in titanium alloy-Ti17[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2003(1/2):128-133. |
| [4] | Lee O S et al.[J].Nuclear Engineering and Design,2003,226:119. |
| [5] | Deshpande V S et al.[J].International Journal of Impact Engineering,2000,24:277. |
| [6] | Albert D E et al.[J].Acta Materialia,1997,45(01):343. |
| [7] | Yia Feng et al.[J].Materials Characterization,2001,47:417. |
| [8] | Al-Mousawi M M et al.[J].Journal of Mechanical Engineering Science,1997,211:273. |
| [9] | Ziegenbein A.;Neuhauser H.;Hahner P. .Propagating Portevin-LeChatelier deformation bands in Cu-15 at.% Al polycrystals: experiments and theoretical description[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2001(0):336-339. |
| [10] | Kovács Z S et al.[J].Materials Science and Engineering A:Structural Materials Properties Microstructure and Processing,2002,325:255. |
| [11] | Draheim K J et al.[J].Computational Materials Science,1996,5:67. |
| [12] | 彭开萍,陈文哲,钱匡武.3004铝合金动态应变时效的微观机理[J].材料热处理学报,2005(06):57-61. |
| [13] | Schwink Ch.[J].Materials Science and Engineering A:Structural Materials Properties Microstructure and Processing,1997(234-236):l. |
| [14] | Weaver M L.[J].Intermetallics,1996(04):593. |
| [15] | Bross S et al.[J].Computational Materials Science,2003,26:46. |
| [16] | Hong Seonggu et al.[J].Journal of Nuclear Materials,2004,328:232. |
| [17] | Fressengeas C.[J].Materials Science and Engineering A:Structural Materials Properties Microstructure and Processing,2005(400-401):226. |
| [18] | 钱匡武,李效琦,萧林钢,陈文哲,张好国,彭开萍.金属和合金中的动态应变时效现象[J].福州大学学报(自然科学版),2001(06):8-23. |
| [19] | Hong Seonggu et al.[J].Journal of Nuclear Materials,2005,340:307. |
| [20] | 郭大浩,吴鸿兴,王声波,洪昕,王劼,戴宇生,夏小平,张永康,张宏,唐亚新,余承业.激光冲击强化机理研究[J].中国科学(E辑),1999(03):222-226. |
| [21] | Cheng J.;Nasser S. N.- .A MODEL FOR EXPERIMENTALLY-OBSERVED HIGH-STRAIN-RATE DYNAMIC STRAIN AGING IN TITANIUM[J].Acta materialia,2000(12):3131-3144. |
| [22] | Li D Y et al.[J].Acta Materialia,1998,46(08):2573. |
| [23] | Ovono Ovono D et al.[J].Journal of Alloys and Compounds,2007,432:241. |
| [24] | Lumley R N et al.[J].Scripta Materialia,2004,50:1227. |
| [25] | Hu S Y et al.[J].Acta Materialia,2006,54:4699. |
| [26] | 刘刚,丁向东,孙军,陈康华.具有盘状析出相铝合金的时效强化模型[J].中国有色金属学报,2001(03):337-347. |
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