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- W3048691763 abstract "In this work, the effects of Mg contents on the microstructure evolution, Fe–bearing phase selection, and composition microsegregation of Al–xMg–1.0Si–0.2Fe (x = 0.2, 0.7, 1.2, and 1.7 wt.%) alloys were investigated under the sub–rapid solidification (SRS, 102–103 °C/s). The as–cast microstructure transformed from fully columnar to equiaxed grains as Mg content increases, and there was a burst of equiaxed grains in the 1.2Mg sample due to the enhanced constitutional under–cooling. Besides, Mg content altered the types of Fe–bearing intermetallic compounds. β–AlFeSi was the intermetallic compound in the 0.2Mg sample. In contrast, the Fe–bearing phase changed to α–AlFeSi in the 0.7Mg, 1.2Mg, and 1.7Mg samples, because the peritectic transformation of α–AlFeSi to β–AlFeSi was greatly suppressed due to the reduced reaction temperature with increasing Mg contents. Furthermore, 0.7Mg had the weakest composition microsegregation among the studied samples, owing to its fewer number of Mg2Si phase compared to the 1.2Mg and 1.7Mg samples. Moreover, β–AlFeSi in the 0.2Mg sample can form and exist at a high–temperature range, getting coarser and denser, and initiating a more serious composition microsegregation compared to the 0.7Mg sample. The results of this study provide guidelines for reasonably developing high–performance dilute Al–Mg–Si–Fe alloys based on the SRS." @default.
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- W3048691763 date "2020-09-01" @default.
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- W3048691763 title "Effects of Mg contents on the microstructure evolution and Fe–bearing phase selection of Al–Mg–Si–Fe alloys under sub–rapid solidification" @default.
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- W3048691763 doi "https://doi.org/10.1016/j.mtla.2020.100850" @default.
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