Abstract
The effect of cooling rate on the microstructure of ZA48 alloy was investigated. The alloy was prepared using a relatively simple technique, i e, rapid cooling of the melt in a steel wedge mould. The dependence of microstructure on the cooling rate (about 40 to 103 K/s) was determined by the secondary dendrite arm space size measurement, optical microscopy(OM), and transmission electron microscopy (TEM). It is found that the matrix structure over a large cooling rate is composed of α-Al dendrite and eutectoid (α+η), the size of α-Al dendrite decreases with increasing cooling rate. The relationship between the cooling rate and the secondary dendrite arm space size has been established. TEM shows that a large number of small and dispersed precipitations can be seen in the primary α phase of tip region. Electron diffraction pattern shows that the precipitate phase is Zn3Mg2 phase.
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Wang, J., Yan, S., Xie, J. et al. Effect of cooling rate on the microstructure of ZA48 alloy. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 25, 811–813 (2010). https://doi.org/10.1007/s11595-010-0098-8
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DOI: https://doi.org/10.1007/s11595-010-0098-8