Abstract A trace addition of Zr to a multicomponent Al-14Si-3Cu-4.5Ni casting alloy has often been found to form a coarse plate-like Zr-rich intermetallic compound with a size of a few tens of μm at the beginning of solidification. Evaluation of the phase composition has confirmed that the Zr-rich intermetallic phase consists of multicomponent constituent elements, mainly Al, Si, Ni and Fe, and is present in a form of (Al,Si)3(Zr,Ni,Fe). The existence of such a complex (Al,Si)3(Zr,Ni,Fe) phase has not yet been predicted by phase equilibria calculation of the multicomponent Al-14Si-CuNiMg systems. In this paper, transmission electron microscopy studies combined with electron backscattered diffraction pattern analysis reveals the crystallography information of the (Al,Si)3(Zr,Ni,Fe) phase for the first time and identifies it as a modified Al3Zr-D023 crystal (tetragonal, I4/mmm(139)) with slightly changed lattice parameters of a = b = 3.275 A and c = 15.475 A. The primary (Al,Si)3(Zr,Ni,Fe) phase is found to nucleate directly onto AlP particles. The mechanical properties of the Zr-rich intermetallics were also investigated using nanoindentation at both room and elevated temperatures and were compared to those of the Si phase.

中文翻译：

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添加微量 Zr 的 Al-14Si-3Cu-4.5Ni 铸造合金中一种新的富 Zr 金属间相

摘要 经常发现在多组分 Al-14Si-3Cu-4.5Ni 铸造合金中添加微量 Zr 会在凝固开始时形成粗大的板状富 Zr 金属间化合物，其尺寸为几十微米。相组成的评估证实，富Zr金属间相由多组分元素组成，主要是Al、Si、Ni和Fe，并以(Al,Si)3(Zr,Ni,Fe)的形式存在。这种复杂的 (Al,Si)3(Zr,Ni,Fe) 相的存在尚未通过多组分 Al-14Si-CuNiMg 系统的相平衡计算来预测。在本文中，透射电子显微镜研究结合电子背散射衍射图案分析揭示了 (Al,Si)3(Zr,Ni, Fe) 相，并将其鉴定为改性 Al3Zr-D023 晶体（四方晶系，I4/mmm(139)），晶格参数 a = b = 3.275 A 和 c = 15.475 A。发现 Si)3(Zr,Ni,Fe) 相直接在 AlP 颗粒上成核。还使用纳米压痕在室温和高温下研究了富含 Zr 的金属间化合物的机械性能，并与 Si 相的机械性能进行了比较。