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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2020.1
- 수록면
- 1,004 - 1,014 (11page)
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초록· 키워드
KOBO type extrusion and following cyclic forging in two perpendicular directions at temperatures 150–200 °C were appliedto new Mg–9Li–2Al–0.5Sc alloy to study its effect on strength and microstructure evolution. KOBO extrusion of as castingot caused significant grain refinement of (α + β) dual phase Mg–9Li–2Al–0.5Sc alloys down to range 1–10 μm for hcpα phase and 1–5 μm for the β phase as resulted from EBSD studies. At that stage ultimate tensile strength UTS of 168 MPaand elongation of 36% were attained. Additional deformation by cyclic forging alternatively from 2 perpendicular directionscaused formation of much finer grains of average size of few hundred nm observed using TEM and close to 1 μm applyingEBSD technique. Tensile strength increased after that operation above 200 MPa and elongation above 40%, which were thehighest observed in the dual phase Mg–Li based alloys. Deformation by cyclic forging induced formation of strong texturewith 0001 plane parallel to forging directions. Additional precipitates of size below 1 μm at α/β interfaces or within β phasewere identified as hcp AlSc2phase. Fine particles of hcp α phase were observed after severe plastic deformation SPD withinβ phase grains, as effect of diffusion assisted deformation. The amount of hcp α phase increased after SPD up to 70% frominitial 40%. High density of defects at α/β interfaces on 0001 planes observed in HRTEM mode was responsible for promotionof hcp phase formation during SPD.
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