کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
777239 | 1463845 | 2007 | 9 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Al–Si cast alloys under isothermal and thermomechanical fatigue conditions Al–Si cast alloys under isothermal and thermomechanical fatigue conditions](/preview/png/777239.png)
This work presents a survey of the isothermal and anisothermal fatigue behavior of aluminum casting alloys obtained from different processes. Experimental results have shown that porosity, especially large and irregular pores, provides the main factor in decreasing fatigue properties of the tested alloys. In materials with similar porosity levels, other microstructural factors became relevant such as, matrix morphology and the amount of alloying elements. Fractographic analyses showed that fatigue cracks preferentially start to propagate in microcracks or interdendritic shrinkage usually located next to the surface. In most cases, propagation takes place in the eutectic phase, although in the thixoformed material, a transition from transgranular to intergranular mode was observed in the crack propagation mode.
Journal: International Journal of Fatigue - Volume 29, Issues 9–11, September–November 2007, Pages 1846–1854