通过力学性能和电导率测试以及显微组织的TEM分析,研究新型Al-7.5Zn-1.7Mg-1.4Cu-0.12Zr合金的单级时效行为特征.结果表明:当时效温度由100 ℃升高至160 ℃时,合金时效硬化响应速度明显加快,合金进入过时效状态所需的时间缩短,合金的电导率明显提高.与通常的120 ℃,24 h峰时效态相比,合金经140 ℃, 14 h时效处理后,抗拉强度、屈服强度、断后伸长率和电导率分别达到585 MPa, 560 MPa, 16.1 %和22.6 MS/m,其抗拉强度仅降低1%,屈服强度却提高4%,电导率更是提高11%,作为单级时效制度具有较明显的优势.合金峰时效状态下的主要强化相是细小弥散分布的η'相和GP区.随着时效温度的升高,晶内和晶界的析出相粗化,140 ℃时效时出现明显的晶间无析出带.
参考文献
| [1] | John L.[J].Materials Science Forum,2006(519-521):1233. |
| [2] | Warner T.[J].Materials Science Forum,2006(519-521):1271. |
| [3] | Heinz A;Haszler A;Keidel C et al.[J].Materials Science and Engineering A:Structural Materials Properties Microstructure and Processing,2000,280(03):102. |
| [4] | Starke E A;Staley J T .[J].Progress in Aerospace Sciences,1996,32(2-3):131. |
| [5] | Chakrabarti D J;Liu J;Sawtell R R.[A].Melbourne:Institute of Materials Engineering Australasia Ltd,2004 |
| [6] | 陈文.先进铝合金在A380上的应用[J].航空维修与工程,2005(2):40-41. |
| [7] | Boselli J;Chakrabarti D J;Shuey R T.[A].Weinheim:WILEY-VCH Verlag GmbH & Co.KGaA,2008 |
| [8] | Karabin M E;Barlat F;Schultz R W .[J].Journal of Materials Processing Technology,2007,189(01):45. |
| [9] | Clinch M R;Harris S J;Hepples W.[A].Weinheim:WILEY-VCH Verlag GmbH & Co.KGaA,2008 |
| [10] | Gang Sha;Alfred Cerezo .Early-stage precipitation in Al-Zn-Mg-Cu alloy (7050)[J].Acta materialia,2004(15):4503-4516. |
| [11] | Engdahl T.;Hansen V.;Warren PJ.;Stiller K. .Investigation of fine scale precipitates in Al-Zn-Mg alloys after various heat treatments[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2002(1 SpecialIssueSI):59-64. |
| [12] | Starink M J;Li X M .[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,2003,34A(04):899. |
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