Effect of cooling rate on the microstructure of ZA48 alloy |
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Authors: | Jiefang Wang Shuqing Yan Jingpei Xie Zhongxia Liu Jiwen Li Wenyan Wang |
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Affiliation: | (1) Department of Physics and Laboratory of Materials Physics of the Ministry of Education of China, Zhengzhou University, Zhengzhou, 450052, China;(2) The College of Material Science & Engineering, Henan University of Science and Technology, Luoyang, 471003, China |
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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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