The Role of Intermetallic Phases in Fatigue Crack Propagation Behavior of Al-Zn-Mg-Cu Alloys

摘要:

文章预览

The aim of the present work is to determine the role of intermetallic (IM) phases in the fatigue crack propagation behavior of hot-forged Al-Zn-Mg-Cu alloys in T73 condition. To generate differences in the volume fraction and coarseness of various IM particles, the (Fe+Si) impurity level is varied from 0.23 to 0.37 mass%. The fatigue crack propagation tests are conducted in air at ambient temperature and a stress ratio R of 0.1. Characterization of the fatigue fracture surfaces is performed using scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS). Quantified IM particles data for each alloy are then related to the fatigue properties and fractographic analysis results. It was found that almost all particles of the Fecontaining phases (primarily (Cu,Fe,Mn)Al3 and Al7Cu2Fe) are broken and not effective in hindering fatigue crack propagation. On the other hand, the Mg2Si and soluble phase particles smaller than those of the Fe-containing phases contribute beneficially to fatigue life. These particles increase the tortuosity of the crack path and retard the crack growth rate. The crack growth rate decreases as the volume fraction of coarse Fe-containing particles increases, because more secondary cracks are produced decreasing the effective stress intensity at the main crack tip.

信息:

期刊:

编辑:

Dragan P. Uskoković, Slobodan K. Milonjić and Dejan I. Raković

页数:

553-558

引用:

M. Vratnica et al., "The Role of Intermetallic Phases in Fatigue Crack Propagation Behavior of Al-Zn-Mg-Cu Alloys", Materials Science Forum, Vol. 555, pp. 553-558, 2007

上线时间:

September 2007

输出:

价格:

$38.00

[1] I.J. Polmear: Light Alloys: Metallurgy of the Light Metals (Edward Arnold, London 1996).

[2] Y. Ii, P. Li, G. Zhao, X. Liu and J. Cui: Mater. Sci. Eng. A Vol. 397 (2005), p.204.

[3] M. Suzuki, J.O. Peters, G. Lütjering and A. Gysler: Mater. Sci. Forum Vol. 331-337 (2000), p.1543.

[4] B.B. Verma, J.D. Atkinson and M. Kumar: Bull. Mater. Sci. Vol. 24 (2001), p.231.

[5] Z.M. Gasem and R.P. Gangloff: Mater. Sci. Forum Vol. 331-337 (2000), p.1479.

[6] J.T. Staley: Aluminium Vol. 55(4) (1979), p.277.

[7] R. Gurbuz and S.P. Alpay: Scripta Metall. Mater. Vol. 30 (1994), p.1373.

[8] M. Vratnica, Z. Cvijović, H.P. Degischer, G.C. Requena, G. Rumplmair and M. Rakin: Mater. Sci. Forum Vol. 494 (2005), p.217.

DOI: https://doi.org/10.4028/www.scientific.net/msf.494.217

[9] G. Patton, C. Rinaldi, Y. Bréchet, G. Lormand and R. Fougéres: Mater. Sci . Eng. A Vol. 254 (1998), p.207.

从Crossref获取数据。
这可能需要一些时间来加载。