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基于文献报道的相平衡和热化学实验数据,利用相图计算(Calphad)方法对Ni-Yb二元系进行热力学评估。考虑到液相混合焓在25%Yb(摩尔分数)附近有急剧变化,液相采用缔合物模型,组份为Ni、Yb Ni3和Yb;端际固溶体相包括FCC_A1(Ni)、FCC_A1(Yb)和BCC_A2(Yb),均采用亚规则溶体模型,并按照Redlich-Kister多项式进行描述;中间化合物Yb_2Ni_(17)、YbNi_5、YbNi_3、YbNi_2、α-YbNi和β-YbNi都没有明显的固溶度实验数据,均按严格计量比处理。优化得到的Ni-Yb二元系热力学参数自洽合理,能够很好地再现该体系的热化学性质和相图数据。 相似文献
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ThermodynamicAssessmentofGd-NiSystemSuXuping;ZhangWeijingandDuZhenmin(苏旭平)(张维敬)(杜振民)(DepartmentofMaterialsScienceandEngineeri... 相似文献
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采用三维有限元方法计算了不同形状因子的γ’强化相在基体为γ相的Ni基高温合金中引起的弹性应变能密度,进而建立了以形状因子为变量的弹性应变能密度表达式。通过最小化γ’强化相引起的弹性应变能和界面能之和,得到了γ’强化相的平衡形状与其特征半径之间的函数关系。本文的分析很好地解释了文献报道的Ni基高温合金中γ’强化相形状演变的实验规律,结果表明:通过三维有限元法结合强化相粒子形状近似法计算模型,可以给出复杂情况下强化相粒子引起的弹性应变能密度的表达式,并有效地应用于材料共格相变的热力学研究。 相似文献
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The thermodynamic optimization of the Sn-Y and Mg-Sn-Y systems was critically carried out by means of the CALPHAD(CALculation of PHAse Diagram) technique. In the Sn-Y system, the solution phases(liquid, bcc, bct and hcp) were described by the substitutional solution model. The compound Sn3Y5, which has a homogeneity range, was treated as the formula(Sn, Y)3(Sn, Y)2Y3 by a three-sublattice model in accordance with the site occupancies. In the Mg-Sn-Y system, the liquid phase was treated as the formula(Mg, Sn, Y, Mg2Sn) using an associated solution model, and bcc, bct and hcp were treated as the formula(Mg, Sn, Y). The compound Sn3Y5 was treated as the formula(Sn, Y, Mg)3(Sn, Y, Mg)2Y3. The ternary compound MgSnY was treated as stoichiometric compound. A set of self-consistent thermodynamic parameters of the Mg-Sn-Y system was obtained. The projection of the liquidus surfaces and the reaction scheme of the Mg-Sn-Y system were predicted. 相似文献
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文中介绍了国内压缩天然气发展的现状以及大庆地区发展压缩天然气的优势,从国家能源战略、大庆产业结构调整及社会效益等方面进行了分析.对发展车用天然气项目的必要性、可行性、经济效益等方面作了详细的阐述,并且通过与其他车用燃料各种性能进行对比,着重论述了压缩天然气在节约能源等方面的作用。 相似文献
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ThermodynamicEvaluationofGadoliniumShenHuasen,ZhangWeijing,LiuGuoquan,WangRunandDuZhenmin(沈化森)(张维敬)(刘国权)(王润)(杜振民)(Departmento... 相似文献