吉林大学学报(工学版) ›› 2019, Vol. 49 ›› Issue (5): 1636-1643.doi: 10.13229/j.cnki.jdxbgxb20180343

• • 上一篇    

蠕变和人工时效对2524铝合金疲劳裂纹扩展性能的影响

刘义伦1,2(),王卿1,刘驰1,李松柏1,何军1,赵先琼1   

  1. 1. 中南大学 机电工程学院，长沙 410083
    2. 中南大学 轻合金研究院，长沙 410083
  • 收稿日期:2018-04-13 出版日期:2019-09-01 发布日期:2019-09-11
  • 作者简介:刘义伦（1955-），男，教授，博士生导师.研究方向：构件疲劳强度理论与应用方法.E-mail:yilunliu@csu.edu.cn
  • 基金资助:
    国家自然科学基金项目(51375500);中南大学中央高校基本科研业务费专项资金项目(2018zzts465);湖南省科技计划项目(2016GK2005);河北省高等学校科学技术研究青年基金项目(QN2018013)

Effect of creep and artificial aging on fatigue crack growth performance of 2524 aluminum alloy

Yi-lun LIU1,2(),Qing WANG1,Chi LIU1,Song-bai LI1,Jun HE1,Xian-qiong ZHAO1   

  1. 1. College of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China
    2. Light Alloy Research Institute, Central South University, Changsha 410083, China
  • Received:2018-04-13 Online:2019-09-01 Published:2019-09-11

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摘要：

针对蠕变时效和人工时效对2524铝合金疲劳裂纹扩展性能的影响进行了研究，结合透射电镜下合金的微观组织演变，分析了不同时效状态下析出相对合金疲劳性能的影响规律。结果表明：时效4 h后蠕变时效和人工时效合金内微观组织都是以Cu-Mg原子团簇和GPB区为主，表现出较好的抗疲劳性能。相比时效4 h，时效9 h后合金内主要析出相为针状S′相，粗大S′相的出现改变了位错滑移方式，降低了滑移的可逆性，加速了疲劳损伤积累，因此在应力强度因子范围 Δ K ≤ 7 ? M P a · m 1 2 的近门槛区，合金抗疲劳性能明显下降。时效24 h后合金晶界处出现无沉淀析出带，晶内析出相尺寸也更大，进一步加速了合金的疲劳裂纹扩展速率。蠕变应力加速了合金的时效析出进程，相比人工时效，在相同时效时间下，蠕变时效合金内析出相尺寸更大，屈服强度和硬度提高，但抗疲劳性能下降。

关键词: 航空航天材料, 疲劳裂纹扩展, 断裂力学, 2524铝合金, 蠕变时效, 析出相

Abstract:

The effects of creep aging and artificial aging on the fatigue crack propagation properties of 2524 aluminum alloy were investigated. The influence of aging conditions on the fatigue properties of the alloy was analyzed based on the microstructure evolution of the alloy under TEM. The results show that the microstructures of artificial aging and creep aging alloys are mainly Cu-Mg clusters and GPB zones after aging for 4 h, showing good fatigue resistance. Compared with 4 h, after aging for 9 h the microstructures of the alloy are mainly acicular S′ phase. The appearance of these coarse S′ phases changes the slip mode of dislocation, which reduces the reversibility of slip and accelerates the accumulation of fatigue damage. Near the threshold section of Δ K ≤ 7 ? M P a · m 1 2 , the alloy fatigue resistance decreases significantly. The precipitate free zone appears at the grain boundary of the alloy after aging for 24 h, and the precipitates in the grain are also larger in size, further accelerating the fatigue crack growth rate of the alloy. Creep stress accelerates the precipitation process of alloy and compared with artificial aging, the creep aging alloy has larger precipitate size, higher yield strength and hardness, but lower fatigue resistance at the same aging time.

Key words: aerospace materials, fatigue crack propagation, fracture mechanics, 2524 aluminum alloy, creep aging, precipitate

中图分类号: 

  • TG146.2

图1

蠕变时效成型试验示意图"

图2

紧凑拉伸试样（CT试样）"

图3

2524铝合金在不同处理工艺下晶内TEM图像"

图4

2524铝合金在不同处理工艺下衍射花样示意图"

图5

2524铝合金在不同处理工艺下晶界TEM图像"

图6

2524铝合金在不同处理工艺下的力学性能"

图7

不同蠕变时间下2524铝合金的疲劳裂纹扩展速率"

图8

不同时效状态下2524铝合金的疲劳裂纹扩展速率"

1 Nakai M ， Eto T . New aspects of development of high strength aluminum alloys for aerospace applications[J]. Materials Science and Engineering A, 2000, 285(1-5): 62-68.
2 Starke E , Staley J T . Application of modern aluminum alloys to aircraft[J]. Progress in Aerospace Sciences, 1996, 32(2): 131-172.
3 Warner T . Recently-developed aluminium solutions for aerospace applications[J]. Materials Science Forum, 2006（519-521）: 1271-1278.
4 Zeng Y , Huang X . Forming technologies of large integral panel[J]. Acta Aeronautica Et Astronautica Sinica, 2008, 29(3): 721-727.
5 Zhan L , Lin J , Dean T A . A review of the development of creep age forming: experimentation, modelling and applications[J]. International Journal of Machine Tools & Manufacture, 2011, 51(1): 1-17.
6 Jeunechamps P P , Ho K C , Lin J , et al . A closed form technique to predict springback in creep age-forming[J]. International Journal of Mechanical Sciences, 2006, 48(6): 621-629.
7 Zhan L , Lin J , Dean T A , et al . Experimental studies and constitutive modelling of the hardening of aluminium alloy 7055 under creep age forming conditions[J]. International Journal of Mechanical Sciences, 2011, 53(8): 595-605.
8 Zhang J , Zhang S N , Liang E W . Blazar Anti-Sequence of spectral variation within individual blazars: cases for Mrk 501 and 3C 279[J]. The Astrophysical Journal, 2013（767): 1-7.
9 Jeshvaghani R A , Zohdi H , Shahverdi H R , et al . Influence of multi-step heat treatments in creep age forming of 7075 aluminum alloy: optimization for springback, strength and exfoliation corrosion[J]. Materials Characterization, 2012, 73(11): 8-15.
10 Xu Y , Zhan L , Li W . Effect of pre-strain on creep aging behavior of 2524 aluminum alloy[J]. Journal of Alloys & Compounds, 2017, 691: 564-571.
11 Yin D , Liu H , Chen Y , et al . Effect of grain size on fatigue-crack growth in 2524 aluminium alloy[J]. International Journal of Fatigue, 2016, 84: 9-16.
12 Srivatsan T S , Kolar D , Magnusen P . The cyclic fatigue and final fracture behavior of aluminum alloy 2524[J]. Materials & Design, 2002, 23(2): 129-139.
13 Baptista C A R P , Adib A M L , Torres S , et al . Describing fatigue crack growth and load ratio effects in Al 2524 T3 alloy with an enhanced exponential model[J]. Mechanics of Materials, 2012, 51: 66-73.
14 Shih H C , Ho N J , Huang J C . Precipitation behaviors in Al-Cu-Mg and 2024 aluminum alloys[J]. Metallurgical & Materials Transactions A, 1996, 27(9): 2479-2494.
15 Bagaryatsky Y A . Structural changes on aging Al-Cu-Mg alloys[J]. Doklady Akademii nauk SSSR， 1952, 87(3): 397-559.
16 Chen Y Q , Yi D Q , Jiang Y , et al . Twinning and orientation relationships of T-phase precipitates in an Al matrix[J]. Journal of Materials Science, 2013, 48(8): 3225-3231.
17 Chen Z , Chen P , Li S . Effect of Ce addition on microstructure of Al20Cu2Mn3 twin phase in an Al-Cu-Mn casting alloy[J]. Materials Science & Engineering A, 2012, 532: 606-609.
18 刘义伦， 羿九火， 杨大炼, 等 . 固溶温度对7075铝合金组织及高周疲劳性能的影响[J]. 金属热处理， 2016， 41(3): 1-7.
Liu Yi-lun , Yi Jiu-huo , Yang Da-lian , et al . Effects of solution treatment on microstructure and high cycle fatigue properties of 7075 aluminum alloy[J]. Heat Treatment of Metals, 2016, 41(3): 1-7.
19 陈宇强, 潘素平, 刘文辉, 等 . 析出相对Al-Cu-Mg合金蠕变行为的影响[J]. 中国有色金属学报, 2015, 25(4): 900-909.
Chen Yu-qiang , Pan Su-ping , Liu Wen-hui , et al . Effect of precipitates on creep behaviors of Al-Cu-Mg alloy [J]. The Chinese Journal of Nonferrous Metals, 2015， 25(4): 900-909.
20 Ringer S P , Sakurai T , Polmear I J . Origins of hardening in aged Al-Cu-Mg-(Ag) alloys[J]. Acta Materialia, 1997, 45(9): 3731-3744.
21 湛利华, 李炎光, 黄明辉 . 应力作用下2124合金蠕变时效的组织与性能[J]. 中南大学学报:自然科学版, 2012, 43(3): 926-931.
Zhan Li-hua , Li Yan-guang , Huang Ming-hui . Microstructures and properties of 2124 alloy creep ageing under stress[J]. Journal of Central South University (Science and Technology), 2012, 43(3): 926-931.
22 汤华国, 马贤锋, 赵伟, 等 . 高性能金属铝的制备、微观结构及其热稳定性[J]. 吉林大学学报: 工学版, 2017, 47(5): 1542-1547.
Tang Hua-guo , Ma Xian-feng , Zhao Wei , et al . Synthesis microstructure and thermal properties of high performance bulk Al[J]. Journal of Jilin University (Engineering and Technology Edition), 2017, 47(5): 1542-1547.
23 杨悦, 陈彬 . SiC纳米颗粒对6060型铝合金微弧氧化膜组织结构及耐蚀性能的影响[J]. 吉林大学学报： 工学版, 2011, 41(增刊1): 106-110.
Yang Yue , Chen Bin . Effects of SiC nano-particles on microstructure and the corrosion resistance of micro-arc oxidation films produced on aluminium alloy[J]. Journal of Jilin University (Engineering and Technology Edition), 2011, 41(Sup.1): 106-110.
24 Krol T , Baither D , Nembach E . The formation of precipitate free zones along grain boundaries in a superalloy and the ensuing effects on its plastic deformation[J]. Acta Materialia, 2004, 52(7): 2095-2108.
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