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CALORIMETRY OF PARTIAL MARTENSITIC TRANSFORMATIONS

LI Jianchen , NAN Shenghui and JIANG Qing.(Department of Materials Science and Engineering , Jilin University of Technology , Changchun 130025 , China)Manuscript received 20 Angust 1995 , in revised form 7 April 1996

金属学报(英文版)

Partial thermoelastic martensitic transformations have been studied by calorimetry on CuAlNi single crystals with special methods. The chemical enthalpy change, the elastic energy stored at the interfaces or inside of the martensite and the energy dissipated in acoustic emission were calculated for a partial transformation; the relationship among them was studied based on measured latent heat and transformation temperatures. The influence of specimen shape on the stored elastic energy was evaluated and discussed.

关键词: : partial martensitic transformation , null , null , null

新型三元氯化物熔盐材料的设计及热稳定性研究

宋明 , 魏小兰 , 彭强 , 丁静 , 杨建平

工程热物理学报

为了满足规模化太阳能热发电高温传热蓄热和工业余热回收利用的要求,分析并设计了NaCl-CaCl2-MgCl2三元熔盐体系作为传热蓄热介质.在已有的二元相图的基础上通过共形离子溶液(conformal ionic solution,CIS)模型模拟计算获得计算相图,根据计算相图所预测的低共熔点配比制样,采用热重差热联用分析仪(TG-DSC)对样品的熔点、相变潜热进行了表征,采用高温静态法对熔盐的稳定性进行了初步分析.结果表明:计算相图预测的低共熔点(424℃)与测试结果(428.5℃)基本一致,该熔盐相变潜热高达到191.7 J/g,熔盐在低于600℃下较稳定,适合作为高温潜热蓄热材料.研究为氯化物熔盐相图和热物性提供了宝贵的数据.

关键词: 三元熔盐 , 相图 , 潜热 , 热稳定性

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