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- 저자 : Gizem Ayata (검색결과 1 건)
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Ali Paşa Hekimoğlu,Merve Çalış,Gizem Ayata 대한금속·재료학회 2019 METALS AND MATERIALS International Vol.25 No.6
In this study, a binary Al–12Si, eight ternary Al–12Si–Sr, and six quaternary Al–12Si–0.1Sr–(0.2–1)Mg alloys were producedby permanent mold casting. It was observed that microstructure of the binary alloy consisted of the phases of aluminum richα grains (dendrites), primary silicon, plate like β and eutectic Al–Si containing needle like silicon particles. The ternaryalloys have fine and globular (modified) eutectic silicon particles and higher volume fraction of α (Al) dendrites than binaryalloys. They also contained Al4Srphase after 0.02 wt% Sr, in addition to the phases in the binary alloy. This phase got coarsewhen the strontium ratio exceeded 0.1%. It was observed that the plate like β phase seen in the binary alloys transformed intothe fibrous form δ phase in the ternary alloys. Magnesium addition resulted in transformation of δ phase into script like πphase, and the formation of lamellar like Mg2Siphase when the ratio of it in the quaternary alloys reached the 0.6 wt%. Thelamellar like form of Mg2Siphase changed to Chinese-script type after the 0.6 wt% Mg. The results showed that hardness,yield and tensile strength of the Al–12Si–Sr alloys increased with increasing strontium content up to 0.1 wt%. The resultsalso showed that hardness of the quaternary alloys increased with increasing magnesium content, while yield and tensilestrength increased only up to 0.6 wt% Mg.
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