摘要
以Ｍｉｅｄｅｍｍａ二元合金生成热模型为基础，结合一些基本热力学关系式，利用元素的基本性质计算了１７３３Ｋ下Ａ１－Ｓｃ合金中组元钪的活度及合金的部分热力学函数（Ｈ，Ｇ~Ｅ，Ｓ~Ｅ）．结果表明，在１７３３Ｋ下，溶液中钪的行为相对拉乌尔定律存在较大的负偏差；混合焓，过剩自由能与过剩熵在整个浓度范围内均为负值；混合焓最小值为－１６ｋＪ·ｍｏｌ^(－１)，过剩自由能最小值为－１４．０ｋＪ·ｍｏｌ^(－１)，过剩熵的绝对值较小，接近零．在１７３３Ｋ下，铝钪在全浓度范围内可完全互溶．
Based on Miedemma's model for calculating the formation heat of binary system, the activity of Sc inA1-Sc alloys and some of thermodynamic functions(H, GE, SE) of the alloy at 1733 K were calculated byusing basic properties of the elements (electronegativity , eledronic density nws, mol volume ). The results in-dicated that the Sc conrmhation showed a negative deviation from Rault's Law, mixed enthalpy, excess freeenergy and excess entropy were all negative in the whole range of concention, the minimum value of mixedenthalpy was - 16.5 kJ. mol-1, minimum excess free energy was - 14.0 kJ. mol-1, the absolute value of excess entropy approached zero. A1 and Sc solve each other in the whole range of concentration.
出处
《有色金属》
CSCD
1999年第2期76-78,共3页
Nonferrous Metals
基金
辽宁省科技基金
