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The role of Cr additions and Fe-rich compounds on microstructural features and impact toughness of AlSi9Cu3(Fe) diecasting alloys

机译:Cr和富Fe化合物对AlSi9Cu3(Fe)压铸合金的显微组织和冲击韧性的影响

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摘要

The effect of chromium content on the microstructural evolution of primary and secondary Fe-rich compounds in a high-pressure die-cast AlSi9Cu3(Fe) alloy is reported and then addressed to the impact toughness of the material. Metallographic and image analysis techniques have been used to quantitatively examine the microstructural changes occurring at different Cr levels. The results reveal that the salient microstructural features of diecastings, such as segregation bands and externally solidified grains, are not affected by Cr content, which contrary promotes the formation of primary sludge particles and proeutectic α-Al_x(Fe,Mn,Cr)_ySi_z intermetallic compounds. Any increase in the amount of these Fe-rich particles is coupled with an increase in their size. Upon increasing the Cr level, the modification of sludge morphology from more or less well-formed hexagon to branched or star-like shapes occurs. The polyhedral sludge is associated to a regular rhombic dodecahedron, while the star-like and branched morphologies originate from hollowed rhombic dodecahedron. On the other hand, the morphology of secondary Fe-rich particles seems to not be influenced by Cr content and mainly determined by high cooling rate of diecasting. The impact toughness and the maximum load of the diecast AlSi9Cu3(Fe) alloy decrease as the Cr level exceeds 0.12 wt%.
机译:报道了铬含量对高压压铸AlSi9Cu3(Fe)合金中富铁初生和富仲化合物的微观组织演变的影响,然后针对材料的冲击韧性进行了研究。金相和图像分析技术已用于定量检查在不同铬含量下发生的微观结构变化。结果表明,压铸件的显着微观结构特征,如偏析带和外部凝固的晶粒,不受Cr含量的影响,相反促进了初生污泥颗粒和共晶α-Al_x(Fe,Mn,Cr)_ySi_z金属间化合物的形成。化合物。这些富铁颗粒的量的任何增加都与它们的尺寸增加有关。随着Cr含量的增加,污泥形态从或多或少良好形成的六边形变为分支或星形。多面体污泥与规则的菱形十二面体相关,而星形和分支形态则来自空心的菱形十二面体。另一方面,次生富铁颗粒的形貌似乎不受铬含量的影响,而主要取决于压铸的高冷却速率。当Cr含量超过0.12wt%时,压铸AlSi9Cu3(Fe)合金的冲击韧性和最大载荷降低。

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