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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2022.10
- 수록면
- 2,462 - 2,471 (10page)
- DOI
- 10.1007/s12540-021-01127-y
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초록· 키워드
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The microstructure evolution and mechanical properties of as-extruded Mg-10Li-3Al-3Zn-0.22Si during heat treatment from473 to 673 K were investigated in this paper, and then the strengthening mechanism and fracture behavior of the studied alloywas also analyzed. Experimental results show that the matrix of as-extruded Mg-10Li-3Al-3Zn-0.22Si alloy mainly consistsof α-Mg and β-Li, and dispersive granular phases are AlLi and Li2MgAl.Mg2Siphase shows banded distribution alongextrusion direction. The morphology of α-Mg is from long strip to nearly spherical block at 573 K. The α-Mg reprecipitatesfrom β-Li matrix in the orientation relationship: (0001) α-Mg // (110) β-Li, [11 −2 0] α-Mg // [1 −1 0] β-Li at 623 K. While theAl-rich granular phase is decomposed and dissolve into the gradually, and then AlLi increase again at 673 K, which may becaused by the dissolution at high temperature and precipitation during air cooling in heat treatment. Besides, the solid solutionand dispersion strengthening enhances the strength of alloy after heat treatment. After heat-treated at 573 K for 1 h and thenair cooling, alloy presents excellent mechanical properties with the ultimate tensile strength of 253 ± 3 MPa and elongationof 27 ± 3%, respectively. Compared with the extruded state, ultimate tensile strength of alloy can be increased by about 49%.
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