Microstructural Response to Growth Rate and Mg Additions during Directional Growth of Al-Cu-Mg Alloys
Al-rich Al-Cu-Mg alloys have wide range of applications for automotive and aerospace where the control of the original solidification microstructure is important to achieve desired properties. Under constant temperature gradient G (4.84±0.13 K.mm-1), a series of directional solidification experiments were performed at 6 different growth rates V (16.7 – 166.7 µm/s) and 6 different Mg contents C0-Mg (0 – 5 wt.% Mg) of Al – 5wt.% Cu – (0-5)wt.% Mg alloys. The solid-liquid interface was investigated in as-quenched specimens. Primary dendrite arm spacing λ1 was measured on longitudinal and transverse sections of the specimens. The variations of λ1 with respect to V and C0-Mg were determined and the results were compared to the related theoretical models and the published data.
A. Roósz, V. Mertinger, P. Barkóczy and Cs. Hoó
A. Berkdemir and M. Gündüz, "Microstructural Response to Growth Rate and Mg Additions during Directional Growth of Al-Cu-Mg Alloys", Materials Science Forum, Vol. 649, pp. 425-430, 2010