采用紧凑拉伸(CT)试样,研究了含氢110μg/g的Ti-2Al-2.5Zr钛合金在室温的静载延迟裂纹扩展(da/dt)和疲劳加载裂纹扩展(da/dN)行为,用扫描电镜观察了断口形貌.结果表明,Ti-2Al-2.5Zr合金含氢110μg/g即足以引起材料的静载氢致延迟断裂,氢在裂纹尖端扩散聚集并析出氢化物,导致材料变脆,是氢致延迟断裂的微观机制;而相同含氢量时对疲劳断裂过程的影响微弱,疲劳断裂受通常的裂纹萌生、稳态扩展和瞬断机制控制.
参考文献
| [1] | Shih D S;ROBERTSON I M .Hydrogen embrittlement of alpha titanium[J].Acta Materialia,1988,36:111-124. |
| [2] | MOODY N R;COSTA J E;KIM Y W;BOYER R P.Review of microstructure effects on hydrogen-induced sustained load cracking in structural titanium alloys[A].,1991:587-604. |
| [3] | SASTRY S M L et al.Subcritical crack-growth under sustained load in Ti-6Al-6V-2Sn[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,1981,12:83-94. |
| [4] | Shintaro Ishiyama;Kiyoshi Fukaya;Motokuni Eto;Naoyuki Miya .Metal-hydride characterization and mechanical properties of Ti-6Al-4V alloy[J].Journal of Nuclear Science and Technology,2000(2):144-152. |
| [5] | Yeh MS.;Huang JH. .Hydrogen-induced subcritical crack growth in Ti-6Al-4V alloy[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,1998(1/2):96-107. |
| [6] | Hall I W;HAMMOND C .In situ electron microscopy observations of strain-induced hydrides in α titanium alloy[J].Metal Science Journal,1978,7:339-342. |
| [7] | Petit J;HENAFF G;SARRAZIN-BAUDOUX C.Mechanism and modeling of near-threshold fatigue crack propagation[A].Conshocken PA: ASTM Special Technical Pubication, No.1372,2000:3-30. |
| [8] | Pao P S;FENG C R;GILL S G .Hydrogen-assisted fatigue crack growth in β-annealed Ti-6Al-4V[J].Scripta Materialia,1998,40(11):19-26. |
| [9] | Gao S et al.Fatigue crack growth for Ti-6Al-4V alloy in water[J].Acta Metallurgica Sinica,1986,22(06):195-200. |
| [10] | Paris P C;GOMEZ M P;ANDERSON W P .A rational analytic theory of fatigue[J].The Trend in Engineering,1961,13:9-14. |
| [11] | Suresh S.Fatigue of materials[M].London: Cambridge University Press,1991:193-274. |
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