???????????????????? ?? ???????????????? ?????????????????? ???????????????????? Mg???Si ?? ?????????????? ?????????????? Al-Mg -Si
???????????????????? ?? ???????????????? ?????????????????? ???????????????????? Mg???Si ?? ?????????????? ?????????????? Al-Mg -Si
???????????????????????? ???????????????????? ???????????????????? ?? ???????????????? ?????????? ?????????????????? ???????????????????? Mg???Si ?? Al-Mg-Si ??????????????. ?????????????????? ?????????????????? Mg???Si ?????????? ?????????????????? ?????????? ?????????????????? ???????????????????????????? ??????????, ?????? ??????????????, ??????, ?????????????????? ?????????????? ?? ??????, ?????????????????? ???????????????? ?? ??????????????, ???? ?????? ?????????? ?????????????????? ?? ?????????????????????? ????????????????, ?????????????????? ???????????????????? ?????????? ?? ?????????????????????? ?????????????????????????? ????????????????. ???????????????? ?????? ?????????????????? ??????????????????????, ?? ?????????? ???????????????????????????????? ?????????????? ???????????????????? ?????????????????? (Mn, Sr, Li, Ti) ???? ???????????? ?? ???????????????????? ?????????????????? ???????????????????? Mg???Si.
???????????????????????? ???????????????????? ???????????????????? ?? ???????????????? ?????????? ?????????????????? ?????????????????? Mg???Si ?? Al-Mg-Si ??????????????. ???????????????? ???????????????? Mg???Si ???????????????????????? ???????? ?????????? ?????????????????????? ??????????, ???? ??????????????, ??????, ?????????????? ?????????????? ???? ??????, ?????????????????? ???????????????? ???? ??????????????, ???????? ???????? ?????????? ?????????????????? ???? ?????????????????? ????????????????, ?????????????????? ???????????????????? ??????????, ?? ?????????????????????? ?????????????????????? ????????????????. ???????????????? ?????? ?????????????????? ??????????????????????, ?? ?????????? ???????????????????????????? ?????????? ???????????????? ?????????????????? (Mn, Sr, Li, Ti) ???? ???????????? ?? ???????????????????? ?????????????????? ?????????????????? Mg???Si.
Three-dimensional morphologies and growth mechanism of primary crystals Mg???Si in Al-Mg-Si alloys were studied. Primary crystals Mg???Si in the alloys display various geometric shapes, such as octahedron, hopper, truncated octahedron, cube and dendrite, although they tend to form faceted octahedron (equilibrium shape) with minimized total surface free energy. Two mechanisms of modification was presented in the paper, as well as the influence on the size and morphology of the primary crystals Mg???Si of alloying elements (Mn, Sr, Li, Ti) was analyzed.
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