Microstructure and mechanical properties of AlSi10Cu3 alloy with (La+Yb) addition processed by heat treatment

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• 作者：Hong YAN (闫 洪)^a ; ^b ; ^{hyan@ncu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Fanhui CHEN (陈凡荟)^a ; ^b ; Zhenghua LI (李正华)^a ; ^b
• 关键词：AlSi10Cu3 ; (La+Yb) ; heat treatment ; eutectic Si ; β-Al5FeSi ; α-Al8Fe2Si ; mechanical properties ; rare earths
• 刊名：Journal of Rare Earths
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：34
• 期：9
• 页码：938-944
• 全文大小：2282 K

文摘

The optical microscopy, scanning electron microscopy (SEM) and energy-dispersive spectrometry (EDS) were used to assess the influence of micro-addition of (La+Yb) on the microstructure and mechanical performance of the AlSi10Cu3 alloy in heat treatment conditions. It was shown that the appropriate (La+Yb) addition (0.3 wt.% or 0.6 wt.%) transformed the needle-like β-Al₅FeSi phase into Chinese script or spherical α-Al₈Fe₂Si phase. Eutectic silicon refined the long needle-like particles into granular or round particles at 0.6 wt.% (La+Yb) content. Moreover, the La₃Al₁₁ and YbAl₃ phases acted as strengthening phases during the heat treatment processing in the alloy with the addition of (La+Yb). Consequently, the alloy with 0.6 wt.% (La+Yb) exhibited an enhanced mechanical properties response with ultimate tensile strength, elongation, and hardness at 69.35%, 113.26% and 23.61% higher than those of the unmodified alloy, respectively. Further addition (0.9 wt.%) of (La+Yb) resulted in the increasing of the black acicular RE-rich intermetallics during heat treatment, which could aggravate the situation of stress concentration leading to deterioration of the mechanical properties of alloy.