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首页> 外文期刊>Journal of Materials Engineering and Performance >Effect of the Temperature Gradient, Growth Rate, and the Interflake Spacing on the Microhardness in the Directionally Solidified Al-Si Eutectic Alloy
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Effect of the Temperature Gradient, Growth Rate, and the Interflake Spacing on the Microhardness in the Directionally Solidified Al-Si Eutectic Alloy

机译：温度梯度，生长速率和晶间间距对定向凝固Al-Si共晶合金显微硬度的影响

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摘要

An alloy of composition Al-12.6 wt. percent Si was prepared using metals of 99.99 percent purity. Weighed amounts of aluminium and silicon were milted in the vacuum-melting furnace. This irregular eutectic alloys were directionally solidified upward with a constant growth rate V (8.3X10~3 mm/s) and different temperature gradients G (2.0-7.8 K/mm) and also with a constant temperature gradient G (7.8 K/mm) and different growth rates V (8.3-498.7X10~3 mm/s) in the directional solidification furnace. The interflake spacings lambda and microhardness H_v were measured from both transverse section and longitudinal section of the specimen. The variations of H_v with respect to G, V, and lambda have been determined by using the linear regression analysis method. It has been shown that H_v increases with the increasing values of G and V. On the other hand H_v values decreases with the increasing lambda values. The Hall-Petch type relationships obtained in this work have been compared with the previous works.
机译：组成为Al-12.6 wt。使用纯度为99.99％的金属制备了49％的Si。在真空熔炉中将称量的铝和硅溶解。这种不规则共晶合金以恒定的增长率V（8.3X10〜3 mm / s）和不同的温度梯度G（2.0-7.8 K / mm）以及恒定的温度梯度G（7.8 K / mm）定向向上凝固在定向凝固炉中的生长速度V（8.3-498.7X10〜3 mm / s）不同。薄片间距λ和显微硬度H_v是从样品的横截面和纵向两个部分测量的。 H_v相对于G，V和lambda的变化已通过使用线性回归分析方法确定。已经显示出，H_v随着G和V的值的增加而增加。另一方面，H_v值随着λ值的增加而减小。在这项工作中获得的Hall-Petch类型关系已与以前的工作进行了比较。

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