The Study of Phase Transformations of AlSi9Cu3 Alloy by DSC Method
The Study of Phase Transformations of AlSi9Cu3 Alloy by DSC Method
复制标题
DSC法研究AlSi9Cu3合金的相变
DOI：
10.1515/afe-2016-0093
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发表时间：
2016
影响因子：
0.6
通讯作者：
A. Gontarczyk
中科院分区：
文献类型：
--
作者：
J. Piątkowski;R. Przeliorz;A. Gontarczyk
通过使用差示扫描量热法（DSC），定义了用于例如汽车工业的加压铸件的商业AlSi 9 Cu 3铸造合金（EN AC-46000）的特征温度和相变焓。在10 ℃/min的升温过程中，观察到两种吸热效应。第一个出现在495 ° C和534 ° C之间，另一个出现在555 ° C和631 ° C之间。这些反应的相变焓分别为+6Jg-1和+327Jg-1。在以相同速度冷却过程中，在584 ℃ ~ 471 ℃之间观察到三个吸热反应。转变的总焓为-348 Jg-1。为了补充量热研究，在光学显微镜Reichert和扫描显微镜Hitachi S-4200上进行结构测试（SEM和EDX）。结果表明，在α（Al）固溶体中存在枝晶，同时存在共晶（β）硅晶体，并形成了两种共晶混合物：双共晶α（Al）+β（Si）和复合共晶α+Al 2Cu +β。
With the use of differential scanning calorimetry (DSC), the characteristic temperatures and enthalpy of phase transformations were defined for commercial AlSi9Cu3 cast alloy (EN AC-46000) that is being used for example for pressurized castings for automotive industry. During the heating with the speed of 10 o C min -1 two endothermic effects has been observed. The first appears at the temperature between 495 o C and 534 o C, and the other between 555 o C and 631 o C. With these reactions the phase transformation enthalpy comes up as +6 J g -1 and +327 J g -1 . During the cooling with the same speed, three endothermic reactions were observed at the temperatures between 584 o C and 471 o C. The total enthalpy of the transitions is – 348 J g -1 Complimentary to the calorimetric research, the structural tests (SEM and EDX) were conducted on light microscope Reichert and on scanning microscope Hitachi S-4200. As it comes out of that, there are dendrites in the structure of α(Al) solution, as well as the eutectic (β) silicon crystals, and two types of eutectic mixture: double eutectic α(Al)+β(Si) and compound eutectic α+Al 2 Cu+β.