采用分级淬火试验方法,结合对合金峰时效态硬度、淬火态电导率的测试,拟合得到新型Al-7.5Zn-1.7Mg-1.4Cu-0.12Zr合金的温度—时间—性能(TTP)曲线,并与传统的7B04和7150合金进行比较.结果表明:新型合金的TTP曲线鼻温大约在290℃,其孕育期约为4.5 s,与同等条件下制备的7150合金(320℃,2.6s)和7B04合金(335℃,0.1 s)相比,其TTP曲线的鼻温最低,对应的孕育期最长,反映出新型合金过饱和固溶体的稳定性最高,具有最低的淬火敏感性.进一步的TEM分析表明,随着鼻温附近保温处理时间的延长,合金内部的淬火脱溶析出现象不断加剧.淬火诱导脱溶η相优先在(亚)晶界上形核析出,在晶内依附于已存在的Al3Zr弥散相粒子形核析出；时效后,在这些粗大η相周围形成一定宽度的无沉淀析出带.合金的成分及组织形态影响和决定着合金的淬火敏感性；新型合金淬火可以适当降低冷却速度以减小残余应力.
参考文献
| [1] | T. Warner .Recently-Developed Aluminum Solutions for Aerospace Applications[J].Materials Science Forum,2006(Pt.2):1271-1278. |
| [2] | MILLER W S;ZHUANG L;BOTTEMA J;WITTEBROOD A J de SMET P HASZLER A VIEREGGE A .Recent development in aluminium alloys for the automotive industry[J].Materials Science and Engineering A:Structural Materials Properties Microstructure and Processing,2000,280(03):37-49. |
| [3] | J. Liu .Advanced Aluminum and Hybrid Aerostructures for Future Aircraft[J].Materials Science Forum,2006(Pt.2):1233-1238. |
| [4] | CHAKRABARTI D J;LIU J;SAWTELL R R;VENEMA G B.New generation high strength high damage tolerance 7085 thick alloy product with low quench sensitivity[A].Melbourne:Institute of Materials Engineering Australasia Ltd,2004:969-974. |
| [5] | BERNARDIN J D;MUDAWAR I .Validation of the quench factor technique in predicting hardness in heat treatable aluminum alloys[J].International Journal of Heat and Mass Transfer,1995,38(05):863-873. |
| [6] | STALEY J T .Quench factor analysis of aluminium alloys[J].Materials Science and Technology,1987,3(11):923-935. |
| [7] | 张新明,刘文军,刘胜胆,袁玉宝,邓运来.7050铝合金的TTP曲线[J].中国有色金属学报,2009(05):861-868. |
| [8] | Deschamps A.;Brechet Y. .Influence of quench and heating rates on the ageing response of an Al-Zn-Mg-(Zr) alloy[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,1998(1/2):200-207. |
| [9] | J.S. Robinson;R.L. Cudd;D.A. Tanner .Quench sensitivity and tensile property inhomogeneity in 7010 forgings[J].Journal of Materials Processing Technology,2001(1/3):261-267. |
| [10] | Shengdan Liu;Qimin Zhong;Yong Zhang;Wenjun Liu;Xinming Zhang;Yunlai Deng .Investigation of quench sensitivity of high strength Al-Zn-Mg-Cu alloys by time-temperature-properties diagrams[J].Materials & design,2010(6):3116. |
| [11] | EVANCHO J W;STALEY J T .Kinetics of precipitation in aluminum alloys during continuous cooling[J].Metallurgical and Materials Transactions,1974,5(01):43-47. |
| [12] | 熊柏青,李锡武,张永安,李志辉,朱宝宏,王锋,刘红伟.新型高强韧低淬火敏感性Al-7.5Zn-1.65Mg-1.4Cu-0.12Zr合金[J].中国有色金属学报,2009(09):1539-1547. |
| [13] | MACKENZIES D S .Quench rate and aging effects in AlZnMgCu aluminum alloy[D].Missouri:University of Missouri-Rolla,2000. |
| [14] | S.T. Lim;S.J. Yun;S.W. Nam .Improved quench sensitivity in modified aluminum alloy 7175 for thick forging applications[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2004(1/2):82-90. |
| [15] | A. Deschamps;Y. Brechet .Nature and distribution of quench-induced precipitation in an Al-Zn-Mg-Cu alloy[J].Scripta materialia,1998(11):1517-1522. |
| [16] | CONSERVA M;FIORINI P .Interpretation of quench-sensitivity in Al-Zn-Mg-Cu alloys[J].Metallurgical and Materials Transactions,1973,4(03):857-862. |
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