Abstract

The effect of 0.25, 0.5 and 1 wt% Ni addition on the impression creep behavior of the cast A356 alloy was investigated. Optical and scanning electron microscopy (SEM) equipped with energy dispersive spectrometry (EDS) were used for examination of the microstructure. The alloy’s creep properties were investigated using the impression creep technique under normalized stress of 0.022–0.03 (corresponding to 600–675 MPa) and temperature of 473–513 K. The results showed that the creep properties of A356 alloy were improved by the addition of Ni. The improved creep properties were attributed to the modification of eutectic silicon and the formation of Ni-rich intermetallics. Calculating the values of stress exponent (n) and creep activation energy (Q) indicated that the dominant mechanism was the lattice self-diffusion climb controlled and Ni had no effect on the creep mechanism.

Graphic Abstract

中文翻译：

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镍对A356铝合金组织和蠕变行为的影响

摘要

研究了添加0.25、0.5和1 wt％的Ni对铸造A356合金的压痕蠕变行为的影响。配备有能量色散光谱仪（EDS）的光学和扫描电子显微镜（SEM）用于检查微观结构。使用压痕蠕变技术在归一化应力为0.022–0.03（对应于600–675 MPa）和温度为473–513 K的条件下研究了该合金的蠕变性能。结果表明，添加A356可以改善A356合金的蠕变性能。你。改善的蠕变性能归因于共晶硅的改性和富镍金属间化合物的形成。

图形摘要