亚稳相的纳米尺度稳定化：热力学模型与实验研究  

Nanoscale stabilization of metastable phase:thermodynamic model and experimental studies

作　　者：宋晓艳[1] 徐文武[1] 张哲旭[1] 

机构地区：[1]北京工业大学材料科学与工程学院,新型功能材料教育部重点实验室,北京100124

出　　处：《物理学报》2012年第20期151-158,共8页Acta Physica Sinica

基　　金：国家重点基础研究发展计划(批准号:2011CB612207);国家自然科学基金(批准号:51174009);北京市自然科学基金(批准号:2112006)资助的课题~~

摘　　要：建立了亚稳相合金的热力学模型,描述亚稳相的各种热力学物理量及其随成分、温度、晶粒尺寸等因素的变化.结合模型计算和系列实验,揭示了亚稳相的热力学性质、变化特征及其纳米尺度效应.以亚稳相SmCo_7合金为例,定量研究了亚稳相以单相形式稳定存在的条件及失稳发生的相分解行为.研究结果对亚稳相合金应用过程中相稳定性和相变的调控具有定量化指导意义.A thermodynamic model, into which the nanoscale effect is introduced, is established to describe the thermal parameters of metastable phase, as well as their changes with the concentration, temperature and grain size. Based on the model calculations and experiments, the thermodynamic properties and dependence on the grain size are disclosed. Taking the metastable SmCor phase for example, the conditions for the single-phase stability and the phase decomposition are studied. The results are important for the control of the phase stability and phase transformation of the metastable-phase alloy.

关 键 词：亚稳相 热力学 相稳定性 纳米尺度效应 

分 类 号：TB383.1[一般工业技术—材料科学与工程]