通过力学拉伸、DSC热分析和透射电镜观察,研究了150℃不同时间热暴露对2524合金组织与性能的影响.结果表明:经自然时效(T351)和高温短时人工时效处理(170℃×30min)的合金在热暴露过程中,合金强度随热暴露时间的延长先增加后下降,而伸长率逐渐下降.热暴露500h后,高温短时人工时效处理的试样力学性能退化较快.2524合金高温短时人工时效获得的较大尺寸的原子偏聚(GPB)区比自然时效中的GPB区较难回溶,因此形成的S'相尺寸较大,更易粗化.150℃热暴露合金力学性能衰退的主要原因可归结为合金基体主要强化相S'(Al2CuMg)相粗化以及晶界无析出带(PFZ)的宽化.
参考文献
[1] | 田荣璋;王祝堂.铝合金及其加工手册[M].长沙:中南大学出版社,2000:213-221. |
[2] | Manabu Nakai;Takehiko Eto .New aspects of development of high strength aluminum alloys for aerospace applications[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2000(1/2):62-68. |
[3] | Sfivatsan T S;Kolar D;Maguusen P .Influence of temperature on cyclic stress responset straln resistance,andfracture behavior of aluminum alloy 2524[J].Materials Science and Engineering A,2001,314(1-2):118-130. |
[4] | Srivatsan T S;Kolar D;Maguuscn P .The cyclic fatigue and final fracture behavior of aluminum alloy 2524[J].Materials & Design,2002,23:129-139. |
[5] | I. J. Polmear;G. Pons;Y. Barbaux;H. Octor;C. Sanchez;A. J. Morton;W. E. Borbidge;S. Rogers .After concorde: evaluation of creep resistant Al-Cu-Mg-Ag alloys[J].Materials Science and Technology: MST: A publication of the Institute of Metals,1999(8):861-868. |
[6] | Ortiz D;Brown J;Abdelshehid M et al.The effects of prolonged thermal exposure on the mechanical properties and fracture toughness of C458 aluminum-hthium alloy[J].ENGINEERING FAILURE ANALYSIS,2006,13:170-180. |
[7] | Bray G H;Clazov M;Rioja R J et al.Effect of artificial aging on the fatigue crack propagation resistance of 2000 series aluminum alloys[J].Intemafional Journal of Fatigue,2001,23:265-276. |
[8] | Kamp N;Gao N;Starink M J;Sinclair I .Influence of grain structure and slip planarity on fatigue crack growth in low alloying artificially aged 2xxx alumirtium alloys[J].Intematiohal Journal of Fatigue,2007,29:869-878. |
[9] | suresh S;Vasudevan A K;Bretz P E .Mechanisms of slow fatigue crack growth in high strength Aluminum alloys:role of microstructure and environment[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,1984,15:369-379. |
[10] | 刘延斌,刘志义,李云涛,邓才智.时效对2524铝合金热稳定性的影响[J].材料研究学报,2007(06):585-588. |
[11] | Bet L B .Accelerated artificial ageing regimes of commercial aluminum alloys:I.Al-Cu-Mg alloys[J].Materials Science and Engineering A,2000,280:83-90. |
[12] | HAN-CHENG SHIH;NEW-JIN HO;J.C. HUANG .Precipitation Behaviors in Al-Cu-Mg and 2024 Aluminum Alloys[J].Metallurgical and Materials Transactions, A. Physical Metallurgy and Materials Science,1996(9):2479-2494. |
[13] | S.C. Wang;M.J. Starink .Two types of S phase precipitates in Al-Cu-Mg alloys[J].Acta materialia,2007(3):933-941. |
[14] | Liu YB;Liu ZY;Li YT;Xia QK;Zhou J .Enhanced fatigue crack propagation resistance of an Al-Cu-Mg alloy by artificial aging[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2008(1/2):333-336. |
[15] | 王顺才.高温瞬时和热暴露对2024铝合金组织与性能的影响[J].航空材料学报,1991(01):32. |
[16] | Majimel J;Molenat G;CasanoveM J et al.Investigation of the evolution of hardening precipitates during thermal exposttre or creep of a 2650 aluminium alloy[J].Scripta Materialia,2002,46(02):113-119. |
[17] | 李松瑞;周善初.金属热处理[M].长沙:中南大学出版社,2003:221-224. |
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