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- 저자 : Massoud Emamy (검색결과 1 건)
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Hooman Abedi,Massoud Emamy,Jafar Rassizadehghani,Hamed Mirzadeh 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.5
The effects of cerium-based rare earth (RE) addition and hot deformation via extrusion on the microstructure and mechanicalproperties of Mg-0.5Zn-0.5Zr alloy were studied. It was found that RE addition could effectively refine the as-cast microstructureup to 2 wt% RE with a notable grain refining effect up to 1 wt% RE. High RE additions resulted in a less effectivegrain refinement and the appearance of coarse dendritic microstructure. While the as-cast strength and ductility wereenhanced by increasing RE content up to 1 wt% due to grain refinement, alloys with high RE content faced a remarkable dropin total elongation and also showed lower ultimate tensile strength (UTS) values, which was related to the interconnectedintergranular brittle intermetallics (Mg12RE) with high volume fractions. For the extruded alloy with 1 wt% RE, besidesthe fragmentation and dispersion of intermetallics, a remarkable grain refinement due to the recrystallization processes wasobserved. Accordingly, the UTS of 415 MPa, total elongation of 17% and tensile toughness of 65.9 MJ/m3 were obtained afterextrusion, which are quite superior to the corresponding values of 210 MPa, 12% and 22.1 MJ/m3 for the as-cast counterpart,respectively. Regardless of the processing condition, the grain size effect was found to be the dominant factor in determiningthe yield stress (Hall–Petch law), where the deviation of this trend due to the presence of hard Mg12REphase was discussed.
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