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The influence of melt superheating treatment on the microstructures of Mg-3.5Si-1Al alloys unmodified and modified with 0.2%Sr-Sb(mass fraction) was investigated.The results show that when the melt superheating temperature increases from 750 to 900℃,the average size of primary Mg2Si in the unmodified alloys decreases progressively from about 27 to about 19μm,while that in Sr-Sb-modified alloys is refined considerably from about 14 to about 7μm when the temperature increases from 750 to 850℃,and then slig... 相似文献
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