通过维氏硬度、电导率及拉伸性能测试和TEM观察研究欠时效状态7150合金的高温回归时效行为.结果表明:回归过程对合金的硬度和电导率影响显著.随着回归温度的提高,回归曲线上的谷值点变低,达到谷值点所需的时间变短;在190 ℃回归超过30 min后,晶界析出相明显粗化,并且断开;经过(110 ℃,16 h)+(190 ℃,120 min)+(120 ℃,24 h)的三级时效处理后,合金的抗拉强度为595 MPa,屈服强度为565 MPa,伸长率为12.5%,电导率为21.9 MS/m.采用此三级时效制度,合金的电导率较高,强度损失较小.此三级时效处理具有较长的第二级高温时效时间,适宜工业化操作.
参考文献
| [1] | T. Warner .Recently-Developed Aluminum Solutions for Aerospace Applications[J].Materials Science Forum,2006(Pt.2):1271-1278. |
| [2] | MUKHOPADHYA A K .High strength aluminium alloys for structural application[J].Matals Materials and Processes,2007,19(01):1-26. |
| [3] | A.F. Oliveira Jr.;M.C. de Barros;K.R. Cardoso;D.N. Travessa .The effect of RRA on the strength and SCC resistance on AA7050 and AA7150 aluminium alloys[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2004(1/2):321-326. |
| [4] | Zhihui Li;Baiqing Xiong;Yongan Zhang;Baohong Zhu;Feng Wang;Hongwei Liu .Ageing behavior of an Al-Zn-Mg-Cu alloy pre-stretched thick plate[J].Journal of University of Science and Technology Beijing,2007(3):246-250. |
| [5] | STILLER K;WARREN P J;HANSEN V;ANGENETE J GJONNES J .Investigation of precipitation in an Al-Zn-Mg alloy after two-step ageing treatment at 100 ℃ and 150 ℃[J].Materials Science and Engineering A:Structural Materials Properties Microstructure and Processing,1999,207:55-63. |
| [6] | CINA B .Reducing the susceptibility of alloys,particularly aluminium alloys,to stress corrosion cracking[P].US Patent:3856584,1974-12-24. |
| [7] | Wang, D;Ni, DR;Ma, ZY .Effect of pre-strain and two-step aging on microstructure and stress corrosion cracking of 7050 alloy[J].Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing,2008(1/2):360-366. |
| [8] | T.S. Srivatsan;G. Guruprasad;Vijay K. Vasudevan .The quasi static deformation and fracture behavior of aluminum alloy 7150[J].Materials & design,2008(4):742-751. |
| [9] | SRIVATSAN T S .The low-cycle fatigue and cyclic fracture behaviour of 7150 aluminium alloy[J].International Journal of Fatigue,1991,13(04):313-321. |
| [10] | 大西忠一;张林平 .降低Al-Zn-Mg-Cu系合金应力腐蚀开裂敏感性的热处理方法[J].轻合金加工技术,1989,12:32-42. |
| [11] | 阎大京.时效制度对7475和7050铝合金应力腐蚀及剥层腐蚀性能的影响[J].材料工程,1993(02):13. |
| [12] | LIN J;KERSKER M M .Heat treatment of precipitation hardening alloy[P].US Patent:5108520,1992-04-28. |
| [13] | 冯春,刘志义,宁爱林,曾苏民.超高强铝合金RRA热处理工艺的研究进展[J].材料导报,2006(04):98-101. |
| [14] | X.J. Wu;M.D. Raizenne;R.T. Holt .Thirty Years of Retrogression and Re-Aging (RRA)[J].Canadian Aeronautics and Space Journal,2001(3):131-138. |
| [15] | Reda Y;Abdel-Karim R;Elmahallawi I .Improvements in mechanical and stress corrosion cracking properties in Al-alloy 7075 via retrogression and reaging[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2008(1/2):468-475. |
| [16] | 曾渝,尹志民,朱远志,潘青林,周昌荣.RRA处理对超高强铝合金微观组织与性能的影响[J].中国有色金属学报,2004(07):1188-1194. |
| [17] | 张坤,刘志义,郑青春,许晓嫦,叶呈武.高Zn超高强铝合金的回归再时效处理[J].中南大学学报（自然科学版）,2005(02):188-192. |
| [18] | AMS 4345B.Aluminum alloy,extrusions 6.4Zn-2.4Mg-2.2Cu-0.12Zr (7150-T77511) solution heating treated,stress relieved,and overaged[S].,2005. |
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