The paper presents the results of microstructure tests of EN AC-46000 hypoeutectic Al–Si alloy with and without high-melting-point elements: chromium, molybdenum, vanadium, and tungsten. The above-mentioned elements were used individually or simultaneously in various combinations. The tested castings were made using two technologies: shell molding and high pressure die casting (HPDC). Using X-ray diffraction and microanalysis of the chemical composition an attempt to determine the phase structure of the tested alloy was made. It has been shown that the microstructure of the base alloy consists of dendrites of α(Al) solid solution and complex eutectic mixtures: ternary α(Al) + Al₁₅(Fe,Mn)₃Si₂ + β(Si) and quaternary α(Al) + Al₂Cu + AlSiCuFeMgMnNi + β(Si). High-melting point elements, regardless of the combination used, attach mainly to intermetallic phases rich in Fe and form the Al₁₅(Fe,Mn,M)₃Si₂ phase, where M is any high melting point element or a combination of such elements. It has been shown that the area fraction of the above-mentioned phase increases with increasing content of high melting point elements. A greater area fraction of the Al₁₅(Fe,Mn,M)₃Si₂ phase in the casting from the shell mold in relation to the high pressure die casting has been also found.

中文翻译：

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高熔点元素的AlSi9Cu3（Fe）合金的组织结构

本文介绍了具有和不具有高熔点元素（铬，钼，钒和钨）的EN AC-46000次共晶Al-Si合金的组织测试结果。上述元素单独或以各种组合同时使用。被测试的铸件是使用两种技术制成的：壳模和高压压铸（HPDC）。使用X射线衍射和化学成分的微分析，试图确定被测合金的相结构。结果表明，基体合金的微观结构由α（Al）固溶体的树枝状晶体和复杂的共晶混合物组成：三元α（Al）+ Al ₁₅（Fe，Mn）₃ Si ₂ +β（Si）和四元α （铝）+铝₂Cu + AlSiCuFeMgMnNi +β（Si）。高熔点元素，无论使用哪种组合，都主要附着在富含Fe的金属间相上并形成Al ₁₅（Fe，Mn，M）₃ Si ₂相，其中M是任何高熔点元素或这些元素的组合元素。已经表明，上述相的面积分数随着高熔点元素含量的增加而增加。还发现，相对于高压压铸，壳模铸件中的Al ₁₅（Fe，Mn，M）₃ Si ₂相面积更大。