非等温时效对<strong>7B50</strong>铝合金组织及性能的影响

doi:10.11900/0412.1961.2020.00004

金属学报

2020, Vol. 56

Issue (9): 1255-1264 DOI: 10.11900/0412.1961.2020.00004

本期目录 | 过刊浏览

非等温时效对7B50铝合金组织及性能的影响

李吉臣¹, 冯迪¹^,²(

), 夏卫生², 林高用³, 张新明³, 任敏文¹

1 江苏科技大学材料科学与工程学院镇江 212003
2 华中科技大学材料科学与工程学院武汉 430074
3 中南大学材料科学与工程学院长沙 410083

Effect of Non-Isothermal Ageing on Microstructure and Properties of 7B50 Aluminum Alloy

LI Jichen¹, FENG Di¹^,²(

), XIA Weisheng², LIN Gaoyong³, ZHANG Xinming³, REN Minwen¹

1 School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China
2 School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
3 School of Materials Science and Engineering, Central South University, Changsha 410083, China

引用本文:

李吉臣, 冯迪, 夏卫生, 林高用, 张新明, 任敏文. 非等温时效对7B50铝合金组织及性能的影响[J]. 金属学报, 2020, 56(9): 1255-1264.
Jichen LI, Di FENG, Weisheng XIA, Gaoyong LIN, Xinming ZHANG, Minwen REN. Effect of Non-Isothermal Ageing on Microstructure and Properties of 7B50 Aluminum Alloy[J]. Acta Metall Sin, 2020, 56(9): 1255-1264.

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摘要:

采用硬度测试、电导率测试、室温拉伸、TEM观察、DSC分析以及剥落腐蚀实验，研究了非等温时效对7B50铝合金热轧厚板的微观组织及耐蚀性能的影响。结果表明：经过480 ℃、1 h固溶后室温水淬火，再经1 ℃/min的加热速率升温至215 ℃后立即炉冷至室温的非等温时效，7B50铝合金的晶内析出相细小弥散，晶界相粗大断续。合金抗拉强度可达605 MPa，剥落腐蚀等级可达EB，综合性能优于单级等温峰时效(T6)和双级等温过时效(T76)，与回归再时效(RRA)态性能类似。非等温时效技术实现了短流程操作，且取消等温保温的措施更适用于厚板的时效热处理。

关键词 ： 7B50铝合金, 非等温时效, 强度, 剥落腐蚀性能

Abstract：

Due to the temperature rising or cooling stage in thick plate, non-isothermal ageing has been the research hotspot of heat treatment for Al-Zn-Mg-Cu alloy thick plate. It is possible to replace the isothermal ageing by non-isothermal one because of the high efficiency and practicability. As one of the Al-Zn-Mg-Cu alloy, 7B50 aluminum alloy and its thick plate have supposed to manufacture the wing in "Yun-20" big plane. In this work, hardness test, electrical conductivity test, room temperature tensile test, DSC analysis, exfoliation corrosion test and TEM observation were used to study the influence of non-isothermal ageing on microstructure and corrosion resistance of 7B50 aluminum alloy hot rolling thick plate. Results revealed that, after 480 ℃, 1 h solution and quenched in room temperature water, followed by ageing from room temperature to 215 ℃ at 1 ℃/min heating rate, and furnace cooling to room temperature immediately, the inner precipitates of 7B50 aluminum alloy are fine and dispersed while the ones on grain boundary are coarsened and discontinuous. The tensile strength and exfoliation corrosion grade reached to 605 MPa and EB level, respectively. Comprehensive performance of 7B50 aluminum alloy are excellent overall those of isothermal peak ageing (T6) or isothermal double stages over ageing (T76), but similar to that of retrogression and re-ageing (RRA) treatment. The non-isothermal ageing realized the short process preparation and the measure removing isothermal stage is more suitable for thick plates.

Key words： 7B50 aluminum alloy non-isothermal ageing strength exfoliation corrosion property

收稿日期: 2020-01-02

ZTFLH:

TG146.2

基金资助:国家自然科学基金项目(51801082);江苏省自然科学基金项目(BK20160560);江苏省大学生创新创业训练计划项目(201910289095Y)

作者简介: 李吉臣，男，1997年生，硕士生

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https://www.ams.org.cn/CN/10.11900/0412.1961.2020.00004 或 https://www.ams.org.cn/CN/Y2020/V56/I9/1255

图1 非等温时效(NIT)工艺路线

图2 7B50铝合金非等温时效过程中的硬度和电导率变化曲线

图3 不同时效状态7B50铝合金的室温拉伸性能

图4 不同时效状态下7B50铝合金的晶内相的TEM明场像及SAED谱Color online

图5 不同时效状态下7B50铝合金的晶界相的TEM明场相

图6 不同时效状态试样侵蚀不同时间的剥落腐蚀形貌(a) C25, 6 h；(b) C25, 12 h；(c) C25, 24 h；(d) C25, 48 h；(e) T76, 48 h；(f) RRA, 48 h

图7 7B50铝合金非等温时效过程中的Scheil积分-升温时间关系曲线

图8 不同非等温时效处理的7B50铝合金的DSC曲线

[1]	Feng D, Zhang X M, Chen H M, et al. Effect of non-isothermal retrogression and re-ageing on microstructure and properties of Al-8Zn-2Mg-2Cu alloy thick plate [J]. Acta Metall. Sin., 2018, 54: 100
[1]	(冯迪, 张新明, 陈洪美等. 非等温回归再时效对Al-8Zn-2Mg-2Cu合金厚板组织及性能的影响 [J]. 金属学报, 2018, 54: 100)
[2]	Rometsch P A, Zhang Y, Knight S. Heat treatment of 7xxx series aluminium alloys—Some recent developments [J]. Trans. Nonferrous Met. Soc. China, 2014, 24: 2003
[3]	Zhang X M, Deng Y L, Zhang Y. Development of high strength aluminum alloys and processing techniques for the materials [J]. Acta Metall. Sin., 2015, 51: 257
[3]	(张新明, 邓运来, 张勇. 高强铝合金的发展及其材料的制备加工技术 [J]. 金属学报, 2015, 51: 257)
[4]	Cina B M. Reducing the susceptibility of alloys, particularly aluminium alloys, to stress corrosion cracking [P]. US Pat, 3856584, 1974
[5]	Ø Grong, Shercliff H R. Microstructural modelling in metals processing [J]. Prog. Mater. Sci., 2002, 47: 163
[6]	Hutchinson C R, Gouné M, Redjaïmia A. Selecting non-isothermal heat treatment schedules for precipitation hardening systems: An example of coupled process-property optimization [J]. Acta Mater., 2007, 55: 213
[7]	Feng D, Zhang X M, Liu S D, et al. The effect of pre-ageing temperature and retrogression heating rate on the microstructure and properties of AA7055 [J]. Mater. Sci. Eng., 2013, A588: 34
[8]	Li K, Zhang K, Yang L, et al. Investigation of non-isothermal aging process of 7085 aluminum alloy [A]. Proceedings of the 12th International Conference on Aluminium Alloys [C]. Yokohama, Japan: The Japan Institute of Light Metals, 2010: 2120
[9]	Tang Q J. Study on cooling ageing process of 7A85 aluminum alloy [D]. Harbin: Harbin Institute of Technology, 2010
[9]	(唐秋菊. 7A85铝合金降温时效工艺的研究 [D]. 哈尔滨: 哈尔滨工业大学, 2010)
[10]	Jiang J T, Tang Q J, Yang L, et al. Non-isothermal ageing of an Al-8Zn-2Mg-2Cu alloy for enhanced properties [J]. J. Mater. Process. Technol., 2016, 48: 110
[11]	Liu Y, Jiang D M, Li B Q, et al. Heating aging behavior of Al-8.35Zn-2.5Mg-2.25Cu alloy [J]. Mater. Des., 2014, 60: 116
[12]	Peng X Y, Guo Q, Liang X P, et al. Mechanical properties, corrosion behavior and microstructures of a non-isothermal ageing treated Al-Zn-Mg-Cu alloy [J]. Mater. Sci. Eng., 2017, A688: 146
[13]	Liu Y, Liang S, Jiang D M. Influence of repetitious non-isothermal aging on microstructure and strength of Al-Zn-Mg-Cu alloy [J]. J. Alloys Compd., 2016, 689: 632 doi: 10.1016/j.jallcom.2016.08.017
[14]	AMS 4252B-2005 Aluminum alloy, plate 6.4Zn-2.4Mg-2.2Cu-0.12Zr (7150-T7751) solution heat treated, stress relieved, and overaged [S]. 2005
[15]	Feng D, Zhang X M, Liu S D, et al. Effect of pre-aging temperature and retrogression heating rate on microstructure and properties of 7150 alloy [J]. Chin. J. Nonferrous Met., 2013, 23: 1173
[15]	(冯迪, 张新明, 刘胜胆等. 预时效温度及回归加热速率对7150铝合金显微组织及性能的影响 [J]. 中国有色金属学报, 2013, 23: 1173)
[16]	Xu D, Li Z H, Wang G J, et al. Phase transformation and microstructure evolution of an ultra-high strength Al-Zn-Mg-Cu alloy during homogenization [J]. Mater. Charact., 2017, 131: 285 doi: 10.1016/j.matchar.2017.07.011
[17]	Azarniya A, Taheri A K, Taheri K K. Recent advances in ageing of 7xxx series aluminum alloys: A physical metallurgy perspective [J]. J. Alloys Compd., 2019, 781: 945 doi: 10.1016/j.jallcom.2018.11.286
[18]	Jiang D M, Liu Y, Liang S, et al. The effects of non-isothermal aging on the strength and corrosion behavior of Al-Zn-Mg-Cu alloy [J]. J. Alloys Compd., 2016, 681: 57 doi: 10.1016/j.jallcom.2016.04.208
[19]	Liu L L, Pan Q L, Wang X D, et al. The effects of aging treatments on mechanical property and corrosion behavior of spray formed 7055 aluminium alloy [J]. J. Alloys Compd., 2018, 735: 261 doi: 10.1016/j.jallcom.2017.11.070
[20]	BjØrneklett B I, Ø Grong, Myhr O R, et al. Additivity and isokinetic behaviour in relation to particle dissolution [J]. Acta Mater., 1998, 46: 6257 doi: 10.1016/S1359-6454(98)00260-2
[21]	Ø Grong, Myhr O R. Additivity and isokinetic behaviour in relation to diffusion controlled growth [J]. Acta Mater., 2000, 48: 445 doi: 10.1016/S1359-6454(99)00360-2
[22]	Myhr O R, Ø Grong. Modelling of non-isothermal transformations in alloys containing a particle distribution [J]. Acta Mater., 2000, 48: 1605 doi: 10.1016/S1359-6454(99)00435-8
[23]	Khalfallah A, Raho A A, Amzert S, et al. Precipitation kinetics of GP zones, metastable η′ phase and equilibrium η phase in Al-5.46wt.%Zn-1.67wt.%Mg alloy [J]. Trans. Nonferrous Met. Soc. China, 2019, 29: 233
[24]	Su R M, Qu Y D, Li R D. Pre-aging of retrogression and re-aging of spray formed 7075 alloy [J]. Acta Metall. Sin., 2014, 50: 863
[24]	(苏睿明, 曲迎东, 李荣德. 喷射态7075合金回归再时效中预时效的研究 [J]. 金属学报, 2014, 50: 863)
[25]	Panigrahi S K, Jayaganthan R. Influence of solutes and second phase particles on work hardening behavior of Al 6063 alloy processed by cryorolling [J]. Mater. Sci. Eng., 2011, A528: 3147
[26]	Han N M, Zhang X M, Liu S D, et al. Effects of pre-stretching and ageing on the strength and fracture toughness of aluminum alloy 7050 [J]. Mater. Sci. Eng., 2011, A528: 3714

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