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- 저자 : Azim Gökçe (검색결과 1 건)
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Metallurgical Assessment of Novel Mg–Sn–La Alloys Produced by High‑Pressure Die Casting
Azim Gökçe 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.7
Mg alloys containing Al are widely used for industrial applications, but the use of these alloys as an automotive part is limiteddue to the low melting temperature of the Mg17Al12intermetallic phase. Therefore, magnesium alloys without aluminumthat can withstand higher operating temperatures are of interest to the automotive industry. The objective of this work is todevelop Al-free Mg alloys for industrial applications. In the current work, four types of alloys were produced with varyingLa contents. The high-pressure die casting method was selected to overcome the problems inherent in the gravity castingmethod with respect to the production of parts with complex shapes and thin walls. X-ray diffraction analysis revealed thatthe base alloy (Mg–5Sn wt%) comprises of α-Mg and Mg2Snphases whereas La containing alloys included intermetallicphases such as LaMg3,Mg17La2,and La5Sn3. Corresponding grain sizes of the alloys with La are lower than those of theMg5Sn alloy. Due to this lower grain size and emerging dispersoids, the tensile strength of the Mg5Sn4La alloy (205 MPa)is roughly double that of Mg5Sn. Moreover, the addition of the 4% wt. La to the Mg5Sn alloys led to an increase in yieldstrength and ductility by 25% and 50%, respectively.
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