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Effects of Sb Content on Solidification Pathways and Grain Size of AZ91 Magnesium Alloy 被引量:4

Effects of Sb Content on Solidification Pathways and Grain Size of AZ91 Magnesium Alloy
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摘要 The phase constitution and solidification pathways of AZ91+xSb(x = 0, 0.1, 0.5, 1, in wt%) alloys were investigated through ways of microstructure observation, thermal analysis technique, and thermodynamic calculation. It was found that the non-equilibrium solidification microstructure of AZ91+xSb(x = 0.1, 0.5, 1) is composed of a-Mg matrix, b-Mg17Al12 phase, and intermetallic compound Mg3Sb2. The grain size of the alloys with different Sb contents was quantitatively determined by electron backscattered diffraction technique which shows no grain refinement in Sb-containing AZ91 alloy. Thermodynamic calculations are in reasonable agreement with thermal analysis results, showing that the Mg3Sb2 phase forms after a-Mg nucleation, thus impossible acts as heterogeneous nucleus for a-Mg dendrite. Besides,the solid fraction at dendrite coherency point(fDCPs) determined from thermal analysis decreases slightly with increasing Sb content, which is consistent with the fact that Sb does not refine the grain size of AZ91 alloy. The phase constitution and solidification pathways of AZ91+xSb(x = 0, 0.1, 0.5, 1, in wt%) alloys were investigated through ways of microstructure observation, thermal analysis technique, and thermodynamic calculation. It was found that the non-equilibrium solidification microstructure of AZ91+xSb(x = 0.1, 0.5, 1) is composed of a-Mg matrix, b-Mg17Al12 phase, and intermetallic compound Mg3Sb2. The grain size of the alloys with different Sb contents was quantitatively determined by electron backscattered diffraction technique which shows no grain refinement in Sb-containing AZ91 alloy. Thermodynamic calculations are in reasonable agreement with thermal analysis results, showing that the Mg3Sb2 phase forms after a-Mg nucleation, thus impossible acts as heterogeneous nucleus for a-Mg dendrite. Besides,the solid fraction at dendrite coherency point(fDCPs) determined from thermal analysis decreases slightly with increasing Sb content, which is consistent with the fact that Sb does not refine the grain size of AZ91 alloy.
出处 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2015年第1期115-121,共7页 金属学报(英文版)
基金 financially supported by the National Basic Research Program of China (No. 2013CB632202) the National Natural Science Foundation of China (Nos. 51105350 and 51301173)
关键词 Mg–Al–Zn–Sb alloy Solidification pathways Nucleation Grain size Dendrite coherency Mg–Al–Zn–Sb alloy Solidification pathways Nucleation Grain size Dendrite coherency
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