通过2024-T3和新型2524-T34铝合金的疲劳实验和对试样表面及疲劳断口的观测,研究了材料的微观结构和疲劳裂纹萌生机制.实验在室温下完成,应力比为0.1、加载频率为15 Hz.结果表明:实验材料呈现了再结晶的层状晶粒结构,晶粒沿着轧制方向被拉长,并较为平坦.2024铝合金中二相粒子的分布更为密集无序,且粗大、不规则形状的二相粒子分布更多,而2524铝合金中二相粒子多沿轧制方向呈带状分布.2524铝合金中的多数裂纹萌生于材料中含Fe的粗大的β相粒子,并伴有少量的滑移带裂纹形核和材料缺陷裂纹形核等;包铝层的滑移带形成的挤入挤出为2024和2524包铝合金的裂纹多处形核提供了主要位置.
参考文献
| [1] | A.Zabett,A.Plumtree,Microstructural effects on the small fatigue crack behavior of an aluminum alloy plate,Fatigue and Fract.of Engng.Mater.and Struc.,18,8019(1995) |
| [2] | C.Q.Bowles,J.Schijve,The role of inclusions in fatigue crack initiation in an aluminum alloy,International J.of fatigue,9,171(1973) |
| [3] | J.C.Grosskreutz,G.G.Shaw,Critical Mechanisms in the Development of Fatigue Cracks in 2024-T4 Aluminum,1968. |
| [4] | C.Y.Kung,M.E.Fine,Fatigue crack initiation and microcrack growth in 2024-T4 and 2124-T4 aluminum alloys,Metallurgical Transactions,10(A),603(1979) |
| [5] | E.A.DeBartolo,B.M.Hillberry,Characterization of fatigue crack nucleation sites in 2040-T3 aluminum alloy,Fatigue'99; Proceedings of the Seventh International Fatigue Congress,(Beijing,China,1999) |
| [6] | J.C.Newman,Fracture mechanics parameters for small fatigue cracks,In:Small Crack Test Methods,ASTM STP 1149,edited by J.M.Larsen and J.E.Allison (American Society for Testing and Materials,Philadelphia,1992) p.6-33 |
| [7] | J.C.Newman,P.R.Edwards,Short-Crack Growth Behavior in an Aluminum Alloy-An AGARD Cooperative Test Programme,AGARD 732,Dec.1988. |
| [8] | Ali Merati,A study of nucleation and fatigue behavior of an aerospace aluminum alloy 2024-T3,International Journal of Fatigue,27,33(2005) |
| [9] | T.S.Srivatsan,D.Kolar,P.Maguusen,The cyclic fatigue and final fracture behavior of aluminum alloy 2524,Materials and Design,23,129(2003) |
| [10] | T.S.Srivatsan,D.Kolar,P.Magnusen,Influence of temperature on cyclic stress response,strain resistance and fracture behavior of aluminum alloy 2524,Materials Science and Engng.,A314,118(2001) |
| [11] | P.J.Golden,A.F.Grandt Jr.,G.H.Bray,A comparison of fatigue crack formation at holes in 2024-T3 and 2524-T3 aluminum alloy specimens,International J.of Fatigue,21,211(1999) |
| [12] | A.F.Grandt,D.G.Sexton Jr.,P.J.Golden,A comparison of 2024-T3 and 2524-T3 aluminum alloys under multi-site damage scenarios,in:Proceedings of the 19th Symposium of the International Committee on Aeronautical Fatigue,edited by R.Cooke and P.Poole (Edinburgh.Scotland.1997) p.659-669 |
| [13] | T.Li,Z.G.Chen,High cycle fatigue properties of an 2524 A1 alloy in four-point bend,in:Proceedings of ICHMM2008 (Huangshan,China,2008) |
| [14] | T.Zhai,Y.G.Xu,J.W.Martin,A.J.Wilkinson,G.A.D.Briggs,A self-aligning four-pointbend testing rig and sample geometry effect in four-point bend fatigue,Int.J.Fatigue,21,889(1999) |
| [15] | LI Tang,Investigation on fatigue behavior of 2000 series high strength aluminum alloys,Ph.D thesis,Sichuan University (2008)(李棠,2XXX系列高强铝合金疲劳行为的研究,四川大学博士论文(2008)) |
| [16] | Metals Handbook,9th ed.,Metallography and Microstructures,Vol.9 (Materials Park,OH:ASM Int.,1985) p.355-357 |
| [17] | R.Hutchinson,S.P.Ringer,Metall.Mater.Trans.A,31,2731(2000) |
| [18] | L.M.Wang,H.M.Flower,T.C.Lindley,Precipitation of the Omega phase in 2024 and 2124 aluminum alloys,Scr.Mater.,41,391(1999) |
| [19] | B.Q.Li,F.E.Wawner,Dislocation interaction with semicoherent precipitates (Ω phase) in deformed Al-Cu-Mg-Agalloy,Acta Mater.,46,5483(1998) |
| [20] | L.F.Mondolfo,Aluminum Alloys,Structure and Properties (Butterworths,Boston,1976) p.842 |
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%