Abstract

In this study, A356 powder was alloyed with elemental Nickel (Ni) powder in different ratios using a mechanochemical alloying method. Alloyed A356/XNi powders were cold pressed along one axis under a load of 350 MPa and sintered at 600°C. To determine the effect of intermetallic phases formed on the microstructure in proportion to the amount of Ni, the A356/XNi alloys were characterized by X-ray diffraction (XRD) analysis, density, and microhardness values. As a result, after mechanical alloying, the spherical microstructure of the A356 alloy turned into a spongy form due to the sponge-like Ni elemental powders. After sintering, it was determined by optical microscopy and scanning electron microscopy (SEM) examinations that the grain size of A356/XNi alloys increased with an increasing amount of Ni. In addition, it was determined that the relative density and amount of porosity increased with an increasing amount of Ni. According to the XRD analysis results, it was determined that AlNi, Al₃Ni₂, Al₃Ni and AlFeNi intermetallic phases formed in the microstructure due to the mechanochemical and sintering process.

中文翻译：

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机械化学法制备A356/Ni合金的显微组织和力学性能

摘要

在这项研究中，使用机械化学合金化方法将 A356 粉末与不同比例的元素镍 (Ni) 粉末合金化。合金 A356/XNi 粉末在 350 MPa 载荷下沿一个轴冷压并在 600°C 下烧结。为了确定形成的金属间相对微观结构的影响与 Ni 的量成正比，通过 X 射线衍射 (XRD) 分析、密度和显微硬度值对 A356/XNi 合金进行了表征。结果，在机械合金化之后，由于海绵状镍元素粉末，A356合金的球形微观结构变成了海绵状。烧结后，通过光学显微镜和扫描电子显微镜 (SEM) 检查确定 A356/XNi 合金的晶粒尺寸随着 Ni 含量的增加而增加。此外，确定了相对密度和孔隙率随着Ni量的增加而增加。根据XRD分析结果，确定AlNi、Al₃ Ni ₂、Al ₃ Ni 和AlFeNi 金属间相由于机械化学和烧结过程在微观结构中形成。