Measurement of liquid permeability in the mushy zones of aluminum-copper alloys
Measurement of liquid permeability in the mushy zones of aluminum-copper alloys
复制标题
铝铜合金糊状区液体渗透率的测量
DOI：
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
S. Viswanathan
中科院分区：
文献类型：
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作者：
A. Duncan;Q. Han;S. Viswanathan
Al-15.42 pct Cu 和 Al-8.68 pct Cu 合金样品糊状区域的液体渗透率测量是在略高于共晶温度的条件下进行的，使用共晶液体作为流体。开发了一种改进的方法，用于根据在这些合金上收集的数据来确定测试期间随时间变化的比磁导率 (Ks)。讨论了影响渗透率测量的因素。在整个实验过程中观察到渗透率发生变化。这是由于实验过程中样品中发生的微观结构粗化和沟道造成的。粗化速率是针对没有流体流动的等温粗化测试确定的，并且观察到结果小于存在流体流动的渗透性测试所指示的速率。仔细测量液体的体积分数 (gL) 表明，gL 在测试过程中下降。然后使用 Kozeny-Carman 方程将渗透率与样品的微观结构相关联。当使用测试初始阶段的微观结构参数时，与之前的研究相比，测量的 KS、gL 和比固体表面积 (SV) 之间的相关性显着改善。
Measurements of liquid permeability in the mushy zones of Al-15.42 pct Cu and Al-8.68 pct Cu alloy samples were performed isothermally just above the eutectic temperature, using eutectic liquid as the fluid. A modified method was developed to determine the specific permeability as a function of time (Ks) during the test from the data collected on these alloys. Factors affecting permeability measurements are discussed. The permeabilities are observed to vary throughout the experiment. This is attributed to microstructural coarsening and channeling that occur in the sample during the experiment. Coarsening rates are determined for the isothermal coarsening tests without fluid flow, and the results are observed to be less than the rates indicated from permeability tests where fluid flow is present. Careful measurement of the volume fraction of liquid (gL) shows that gL decreases during the test. The permeability is then related to the microstructure of the sample using the Kozeny-Carman equation. The correlation between the measured KS, gL, and specific solid surface area (SV) improves markedly when compared to previous studies, when microstructural parameters at the initial stage of the test are used.