研究了回归时间对RRA处理后高Zn超高强度铝合金的组织和性能的影响.结果表明,以100℃/24 h为预时效和再时效参数,合金在200℃回归7 min的RRA(回归再时效)状态综合性能最好.其室温力学性能达到:σb=795 MPa,σ0.2=767 MPa,δ5=9.1%;抗应力腐蚀性能达到:在3.0%NaCl+0.5%H2O2腐蚀液环境及210 MPa拉伸应力下,断裂时间大于720 h.在200 ℃/7 min回归的RRA状态,其晶内的弥散粒子和再时效期间变窄的晶界无析出带保证了合金的超高强度.随着回归时间的延长,晶内粒子的弥散度下降,回归时形成的较宽的晶界无析出带不能再时效粒子填充而使强度大幅度降低.同时,处于该状态的合金具有优良的抗应力腐蚀性能,得益于晶界大尺寸,大间距粒子具有捕获氢原子、逸出氢气泡的作用,以及回归降低了晶界附近的位错密度、切断了氢原子向晶界迁移的通道.
参考文献
| [1] | LI Hongying,GENG Jinfeng,ZHANG Jianfei,DONG Xianjuan,Influence of ageing on fracture toughness and stress corrosion cracking resistance of B95 лч forging,Journal of Material Engineering,4,28(2006)(李红英,耿进锋,张建飞,董显娟,时效制度对B95 лч锻件断裂韧性和抗应力腐蚀性能的影响,材料工程,4,28(2006)) |
| [2] | LI Hal,WANG Zhixiu,ZHENG Ziqiao,Influence of predeformation and aging on properties and microstructures of 7055 Al alloy,Rare Metal Materials and Engigeering,35(8),1276(2006)(李海,王芝秀,郑子樵,预变形及时效处理对7055铝合金组织和性能的影响,稀有金属材料与工程,35(8),1276(2006)) |
| [3] | ZHANG Kun,LIU Zhiyi,ZHENG Qingchun,XU Xiaochang,YE Chengwu,Effects of different retrogression and reaging heat treatment on high zinc super high strength aluminum alloy,J.Cent.South Univ.(Science and Technology),36(2),188(2005)(张坤,刘志义,郑青春,许晓嫦,叶呈武,高Zn超高强铝合金的同归再时效处理,中南大学学报(自然科学版),36(2),188(2005)) |
| [4] | B.Cina,Reducing the Susceptibility of Alloys,Particularly Aluminium Alloys,to Stress Corrosion Cracking,U.S.Patent 3856584,December 24,1974 |
| [5] | T.Ashish,R.Raman,S.N.Malhotra,Hydrogen embrittlement studies of aged and retrogressed -reaged Al-Zn-Mg alloys,Materials Chemistry and Physics,101,441(2007) |
| [6] | M.U.Islam,W.Wallace,Retrogression and reaging response of 7475 aluminium alloy,Metals Technology,10(10),386(1983) |
| [7] | LI Zhihui,XIONG Baiqing,ZHANG Yongan,ZHU Baohong,WANG Feng,LIU Hongwei,Ageing behavior of an Al-Zn-Mg-Cu alloy pre-stretched thick plate,Journal of University of Science and Technology Beijing,14(3),246(2007) |
| [8] | N.Danh,K.Rajan,W.Wallaee,Discussion of effect of retrogression and reaging treatments on the microstructure of Al-7075-T651,Metallurgical Transactions A (Physical Metallurgy and Materials Science),16(11),2068(1985) |
| [9] | M.U.Islam,W.Wallace,Stress corrosion crack growth behaviour of 7475 T6 retrogressed and reaged aluminum alloy,Metals Technology,11(8),320(1984) |
| [10] | R.T.Holt,V.R.Parameswaran,W.Wallace,RRA treatment of 7075-T6 aluminum components,Canadian Aeronautics and Space Journal,42(2),83(1996) |
| [11] | A.Gazda,M.Warmuzek,W.Wierzchowski,DTA investigation of the retrogression and re-ageing in some A1ZnMgCu alloys,Thermochimica Acta,303,197(1997) |
| [12] | NING Ailin,LIU Zhiyi,FENG Chun,ZENG Sumin,Analysis on the behavior of exceeding peak aging strength of aluminum alloy at condition of retrogression and reaging,Acta Metallurgica Sinica,42(12),1253(2006)(宁爱林,刘志义,冯春,曾苏民,铝合金回归再时效状态的超峰时效强度行为分析,金属学报,42(12),1253(2006)) |
| [13] | M.Puiggali,A.Zielinski,Effect of microstrucure on stress corrosion cracking of an Al-Zn-Mg-Cu alloy,Corrosion Science,40(4/5),805(1998) |
| [14] | M.K.Tseng,J.Liu,Z.H.Jin,Role of Mg segregation to grain boundary in hydrogen-induced crack process of 7050 aluminum alloy,Proc.of ICAA Ⅱ,Beijing,662(1990) |
| [15] | L.Wang,Stress corrosion cracking of aluminium alloy,Proc.of ICAA Ⅱ,Beijing,687(1990) |
| [16] | T.C.Tsai,T.H.Chuang,Role of grain size in the stress corrosion cracking of 7475 aluminum alloy,Mater.Sci.Eng.A,225(2),135(1997) |
| [17] | L.Christodoulou,H.M.Flowet,Hydrogen embritlement and trapping in Al-6%Zn-3%Mg.Acta Metall.,28,481(1980) |
| [18] | M.Talianker,B.Cina,Retrogression and reaging and the role of dislocations in the stress corrosion of 7000-type aluminum alloys,Metallurgical Transactions A (Physical Metallurgy and Materials Science),20(10),2087(1989) |
| [19] | NING Ailin,LIU Zhiyi,FENG Chun,ZENG Sumin,Effect of heat-treatment on the mechanicalproperties of 7A04 alloy with large cross section,Chinese Journal of Materials Research,21(5),511(2007)(宁爱林,刘志义,冯春,曾苏民,热处理对大截面7A04铝合金棒材力学性能的影响,材料研究学报,21(5),511(2007)) |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%