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材料工程  2015 

热处理对7A85铝合金组织和性能的影响

DOI: 10.11868/j.issn.1001-4381.2015.08.003, PP. 13-18

Keywords: 7A85铝合金,时效硬化,显微组织,晶间腐蚀

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Abstract:

采用室温拉伸测试,电导率测试,晶间腐蚀及透射电镜等手段研究不同时效制度对7A85铝合金显微组织,力学性能以及晶间腐蚀性能的影响。结果表明合金经过峰时效(120℃/24h)处理,抗拉强度,伸长率和电导率分别达到760.8MPa,8.9%和29.7%IACS;合金的主要强化相为GP区,峰时效(T6)合金晶内分布着大量细小而弥散的GP区和少量的η'相。双级时效(120℃/8h+165℃/12h)时,合金抗拉强度及电导率分别达到597.7MPa和38.1%IACS,且随着时效时间的延长,晶间析出相长大粗化,PFZ带宽化,晶间腐蚀敏感性降低。因此,采用120℃/8h+165/12h双级时效可以获得较好的综合性能。

References

[1]  HEINZ A, HASZLER A, KEIDEL C, et al. Recent development in aluminum alloys for aerospace applications[J]. Materials Science and Engineering:A,2000,280(1):102-107.
[2]  胡本润, 马少俊, 童策华, 等. 7050铝合金锻件缺陷容限值试验方法研究[J]. 航空材料学报,2015,35(1):82-86.HU B R, MA S J, TONG D H, et al. Test methods for determining flaw tolerance value of 7050 aluminum alloy forging[J]. Journal of Aeronautical Materials,2015,35(1):82-86.
[3]  王少华, 马志锋, 张显峰, 等. Al-Zn-Mg-Cu-Zr-0.5Er合金型材组织性能研究[J]. 材料工程,2014,(3):27-33.WANG Shao-hua, MA Zhi-feng, ZHANG Xian-feng, et al. Investigation on microstructure and properties of Al-Zn-Mg-Cu-Zr-0.5Er alloy profile[J]. Journal of Materials Engineering,2014,(3):27-33.
[4]  宁爱林.析出相及其分布对高强铝合金力学性能的影响[D]. 长沙:中南大学,2007.NING Ai-lin. Effect of precipitates and its distribution on mechanical properties of high-strength aluminum alloy[D]. Changsha:Central South University,2007.
[5]  辛星, 张新明, 刘胜胆, 等. 回归再时效中预时效温度对7050铝合金应力腐蚀性能的影响[J]. 材料工程,2014,(5):29-34.XIN Xing, ZHANG Xin-ming, LIU Sheng-dan, et al. Effect of pre-aging temperature in retrogression and re-aging treatment on stress corrosion resistance of 7050 aluminum alloy[J]. Journal of Materials Engineering,2014,(5):29-34.
[6]  ADLER P N, DEILSI R. Calorimetric studies of 7000 series aluminum alloys: Ⅱ.comparison of 7075, 7050 and RX720 alloys[J]. Metallurgical Transactions A,1977,8(7):1182-1190.
[7]  ROBSON J D. Microstructural evolution in aluminum alloy 7050 during processing[J]. Materials Science and Engineering:A,2004,382:112-121.
[8]  SHA G, CEREZO A. Early-stage precipitation in Al-Zn-Mg-Cu alloy (7075)[J]. Acta Materialia,2004,52(15):4503-4516.
[9]  SALEH A E-A. Intergranular corrosion behavior of the 7075-T6 aluminum alloy under different annealing conditions[J]. Materials Chenistry and Physics,2011,126(3):607-613.
[10]  CHEN Song-yi, CHEN Kang-hua, PENG Guo-sheng, et al. Effect of heat treatment on strength, exfoliation corrosion and electrochemical behavior of 7085 aluminum alloy[J]. Materials and Design,2012,35:93-98.
[11]  SPROWLS D O, BROWN R H. Fundamental aspects of stress corrosion cracking[A]. STACHLE R W, FORT A J, ROOYEN D V. National Association of Corrosion Engineers[C]. Houston, TX, 1969.466-512.
[12]  万彩云. AlZnMgCu合金微观组织及强化相的研究[D].长沙: 湖南大学,2010. WAN Cai-yun. Study of the micro-structure & hardening precipitates in AlZnMgCu aluminium alloy[D]. Changsha:Hunan University,2010.
[13]  VALIEV R Z, MURASHKIN Y M, SABIROV I. A nanostructural design to produce high-strength Al alloys with enhanced electrical conductivity[J]. Scripta Materialia,2014,76:13-16.
[14]  田莳,李秀臣,刘正堂. 金属物理性能[M]. 北京:航空工业出版社,1994.36-37.
[15]  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]. Materials Science and Engineering:A, 2011,528(10):3714-3721.
[16]  贺俊光,文九巴,周旭东. 第二相对Al-Zn-Sn-Ga-Mg合金腐蚀行为的影响[J]. 中国有色金属学报,2013,23(3):628-634. HE Jun-guang, WEN Jiu-ba, ZHOU Xu-dong. Influence of second phase on corrosion behavior of Al-Zn-Sn-Ga-Mg alloy[J]. The Chinese Journal of Nonferrous Metals,2013,23(3):628-634.
[17]  DAVIES J R. Corrosion of aluminum and aluminum alloys[M]. Ohio:ASM International,1999.28-29.
[18]  李国峰,张新明. 回归冷却速率对7050铝合金力学性能及晶间腐蚀抗力的影响[J]. 中国有色金属学报,2013,23(5):1234-1240. LI Guo-feng,ZHANG Xin-ming. Effect of retrogression cooling rate on mechanical properties and resistance to intergranular corrosion of 7050 aluminum alloy[J]. The Chinese Journal of Nonferrous Metals,2013,23(5):1234-1240.

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