Thermodynamic description and unidirectional solidification of eutectic organic alloys: IV. Binary systems neopentylglycol脙脙脙脙脙脙succinonitrile and amino-methyl-propanediol脙脙脙脙脙脙succinonitr
- 作者：Witusiewicz ; V.T. ; Sturz ; L. ; Hecht ; U. ; Rex ; S.
- 关键词：Neopentylglycol脙脙脙脙脙脙succinonitrile ; Amino-methyl-propanediol脙脙脙脙脙脙succinonitrile ; Binary system ; Thermodynamic description ; Bridgman solidification ; Eutectic growth
- 刊名：Acta Materialia
- 出版年：2005
- 期刊代码：1_13596454
- 类别：ms
- 出版时间：January 3, 2005
- 卷：53
- 期：1
- 页码：173-183
- 文件大小：811 K
摘要
The temperature and enthalpy of transformations of organic alloys from the binary systems neopentylglycol芒芒芒succinonitrile (NPG芒芒芒SCN) and 2-amino-2-methyl-1,3-propanediol芒芒芒succinonitrile (AMPD芒芒芒SCN) were measured by means of differential scanning calorimetry (DSC). The phase diagrams of these binary systems were assessed via the CALPHAD approach using Thermo-Calc by simultaneously optimizing the thermodynamic and phase equilibrium data measured in the present work. Proper agreements between the experimental and calculated data for the phase diagrams as well as for the thermochemical properties were achieved. Experiments and calculations show that both the NPG芒芒芒SCN and the AMPD芒芒芒SCN systems exhibit a non-variant eutectic reaction with the eutectic point at 90.45 mol%SCN (318.0 K) and at 97.39 mol%SCN (325.7 K), respectively. In the NPG芒芒芒SCN system the temperature of the eutectic reaction is about 3 K higher than the temperature of the transformation from the ordered crystals (OCs) to the orientationally disordered crystals (ODICs), whereas the eutectic reaction in the AMPD芒芒芒SCN involves the OCs of AMPD and the ODICs of SCN.