钪锆复合添加对Al-Zn-Mg合金淬火敏感性的影响
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摘要
以Al-5. 7Zn-2. 0Mg和Al-5. 7Zn-2. 0Mg-0. 10Sc-0. 10Zr(wt%)合金为研究对象,通过分级淬火方法,获得两种合金的时间-温度-性能(TTP)曲线,结合淬火因子分析法及电子显微分析技术,对比研究了钪锆复合添加对铝锌镁合金淬火敏感性的影响。结果表明:Al-Zn-Mg和Al-Zn-Mg-Sc-Zr合金的鼻尖温度分别为300℃和290℃,淬火敏感区间分别为230～350℃和170～380℃,临界淬火速率分别为2℃/s和8℃/s。钪锆添加提高铝锌镁合金淬火敏感性的原因主要为:在淬火连续冷却过程中,当淬火冷却速度较慢时,Al-Zn-Mg-Sc-Zr合金存在的纳米级Al_3(Sc,Zr)粒子会成为粗大时效相η(MgZn_2)的异质形核中心,降低了过饱和固溶体的稳定性。
Time-temperature-properties(TTP)curves of two alloys(Al-5.7Zn-2.0Mg and Al-5.7Zn-2.0Mg-0.10Sc-0.10Zr)were obtained by step quenching.Meanwhile,effect of adding extra Sc and Zr on quenching sensitivity of the Al-Zn-Mg alloy was investigated by electronic microanalysis and quench factor analysis.The results indicate thatnose temperature ofthe Al-Zn-Mg alloy,quenching interval and critical quenching speed are 300℃,230-350℃ and 2℃/s,respectively.The corresponding data of the Al-Zn-Mg-Sc-Zr alloy are 290℃,170~380℃and 8℃/s,respectively.The main reasons for improving the quenching sensitivity of Al-Zn magnesium alloy by adding scandium and zirconium are during the continuous cooling process,the nanoscaled Al_3(Sc,Zr)particles in the Al-Zn-Mg-Sc-Zr alloy will become the heterogeneous nucleation core of the coarsephaseη(MgZn_2)when the cooling rate is relatively slow,and the stability of supersaturated solid solution is reduced.
Time-temperature-properties(TTP)curves of two alloys(Al-5.7Zn-2.0Mg and Al-5.7Zn-2.0Mg-0.10Sc-0.10Zr)were obtained by step quenching.Meanwhile,effect of adding extra Sc and Zr on quenching sensitivity of the Al-Zn-Mg alloy was investigated by electronic microanalysis and quench factor analysis.The results indicate thatnose temperature ofthe Al-Zn-Mg alloy,quenching interval and critical quenching speed are 300℃,230-350℃ and 2℃/s,respectively.The corresponding data of the Al-Zn-Mg-Sc-Zr alloy are 290℃,170~380℃and 8℃/s,respectively.The main reasons for improving the quenching sensitivity of Al-Zn magnesium alloy by adding scandium and zirconium are during the continuous cooling process,the nanoscaled Al_3(Sc,Zr)particles in the Al-Zn-Mg-Sc-Zr alloy will become the heterogeneous nucleation core of the coarsephaseη(MgZn_2)when the cooling rate is relatively slow,and the stability of supersaturated solid solution is reduced.
引文
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[2]Liu Shengdan,Zhong Qimin,Zhang Yong,et al.Investigation of quench sensitivity of high strength Al-Zn-Mg-Cu alloys by time-temperatureproperties diagrams[J].Materials and Design,2010,31(6):3116-3120.
[3]You Jianghai,Liu Shengdan,Zhang Xinming,et al.Influence of quench transfer time on microstructure and mechanical properties of7055 aluminum alloy[J].Journal of Central South University of Technology,2008,15(2):153-158.
[4]Liu S,Liu W,Zhang Y,et al.Effect of microstructure on the quench sensitivity of Al Zn Mg Cu alloys[J].Journal of Alloys and Compounds,2010,507(1):53-61.
[5]张新明,王雷,欧阳惠,等.Cu含量对Al-9.0Zn-1.5Mg-x Cu合金淬火敏感性的影响[J].金属热处理,2013,38(11):45-51.Zhang Xinming,Wang Lei,Ouyang Hui,et al.Influence of Cu content on quenching sensitivity of Al-9.0Zn-1.5Mg-x Cu alloys[J].Heat Treatment of Metals,2013,38(11):45-51.
[6]Deng Y,Ye R,Xu G,et al.Corrosion behaviour and mechanism of new aerospace Al-Zn-Mg alloy friction stir welded joints and the effects of secondary Al3ScxZr1-x,nanoparticles[J].Corrosion Science,2015,90:359-374.
[7]Tang L,Xu G,Deng Y,et al.Mechanical properties and microstructure of an Al-Zn-Mg-Sc-Zr alloy processed by warm equal channel angular pressing and subsequent aging[J].JOM,2017(10):1-8.
[8]Evancho J W,Staley J T.Kinetics of precipitation in aluminum alloys during continuous cooling[J].Metallurgical Transactions,1974,5(1):43.
[9]Shang B C,Yin Z M,Wang G,et al.Investigation of quench sensitivity and transformation kinetics during isothermal treatment in6082 aluminum alloy[J].Materials and Design,2011,32(7):3818-3822.
[10]Staley J T.Quench factor analysis of aluminium alloys[J].Metal Science Journal,2013,3(11):923-935.
[11]Gang Sha,Alfred Cerezo.Early-stage precipitation in Al-Zn-Mg-Cu alloy(7050)[J].Acta Materialia,2004,52(15):4503-4516.
[12]刘胜胆,张新明,游江海,等.7055铝合金的TTP曲线及其应用[J].中国有色金属学报,2006,16(12):2034-2039.Liu Shengdan,Zhang Xinming,You Jianghai,et al.TTP curve of7055 aluminum alloy and its application[J].The Chinese Journal of Nonferrous Metals,2006,16(12):2034-2039.
[13]Dumont D,Deschamps A,Bréchet Y,et al.Characterisation of precipitation microstructures in aluminium alloys 7040 and 7050 and their relationship to mechanical behaviour[J].Metal Science Journal,2013,20(5):567-576.
[14]刘露露,潘学著,高萌,等.6061铝合金TTP曲线的研究[J].金属热处理,2012,37(4):20-23.Liu Lulu,Pan Xuezhu,Gao Meng,et al.TTP curves of 6061aluminum alloy[J].Heat Treatment of Metals,2012,37(4):20-23.
[15]Mokhtari O,Roshanghias A,Ashayer R,et al.Disabling of nanoparticle effects at increased temperature in nanocomposite solders[J].Journal of Electronic Materials,2012,41(7):1907-1914.
[16]孙辉,刘志勇,杨丽辉,等.含钪7075铝合金的回归热处理[J].金属热处理,2017,42(4):86-90.Sun Hui,Liu Zhiyong,Yang Lihui,et al.RRA treatment of 7075aluminum alloy containing Sc[J].Heat Treatment of Metals,2017,42(4):86-90.
[17]Zhang Yuxin,Yi Youping,Huang Shiquan,et al.Investigation of the quenching sensitivity of forged 2A14 aluminum alloy by timetemperature-tensile properties diagrams[J].Journal of Alloys and Compounds,2017,728:1239-1247.
[18]Wang H,Yi Y,Huang S.Investigation of quench sensitivity of high strength 2219 aluminum alloy by TTP and TTT diagrams[J].Journal of Alloys and Compounds,2017,690:446-452.
[19]Deng Y,Yin Z,Duan J,et al.Evolution of microstructure and properties in a new type 2mm Al-Zn-Mg-Sc-Zr alloy sheet[J].Journal of Alloys and Compounds,2012,517(2):118-126.