Preliminary phase equilibrium relationships have been established in the Zr-Cu-Al system at 800 degree, usign a combination of X-ray diffraction and electron probe microanalysis. These results rae similar to previous investigatios that have been reported in the literature. Several teranry phases are found to exist in this system, many of which lie within the gross compositional vicinity of interest to bulk amorphous alloy formation. The equilibrium phases present in the alloy Zr sub 65Cu sub 27.5Al sub 7.5, whihc exhibits a particularly high T sub x-T sub g in the amorphous state, are Zr sub 2Cu and minor amounts of two additional phases: Zr sub 3Al and what may be a termary phase with a composition near Zr sub 6CuAL sub 3. When the 800 degree phase diagram isotherm is correlated with the known glass forming compostion range of the Zr-CU-AL system, it is found that the best glass forming behavior is confined to those regions of the diagram in which all equilibria include Zr-Cu constituent binary phases and al-poor ternary phases. This may suggest that difficulites in the nucleation of these binary phases plays a role in the glass forming ability of Zr-Cu-Al and related higher order alloys.
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机译：在Xr衍射和电子探针显微分析的结合下，在Zr-Cu-Al体系中以800度建立了初步的相平衡关系。这些结果与文献中报道的先前研究相似。发现该体系中存在数个叔戊烯相，其中许多位于本体非晶态合金形成所关注的总组成附近。 Zr sub 65Cu sub 27.5Al sub 7.5合金中存在的平衡相，在非晶态下表现出特别高的T sub xT sub g，是Zr sub 2Cu和少量的两个附加相：Zr sub 3Al和可能是Zr sub 6CuAL sub 3附近具有组成的三元相。当800度相图等温线与Zr-CU-AL系统的已知玻璃形成组成范围相关时，发现最佳的玻璃形成行为限于图中所有平衡包括Zr-Cu组成的二元相和Al-贫三元相的区域。这可能表明，在这些二元相的成核过程中，难燃物在Zr-Cu-Al和相关高阶合金的玻璃形成能力中起作用。
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