膨胀仪测试材料初熔点的方法探讨  

Discussion about initial melting point test of materials by expansion method

作　　者：李雄伟[1] 时园园 姜亚南[1] 张重远[1] LI Xiongwei;SHI Yuanyuan;JIANG Ya'nan;ZHANG Zhongyuan(Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China)

机构地区：[1]中国科学院金属研究所,辽宁沈阳110016

出　　处：《物理测试》2023年第6期11-16,共6页Physics Examination and Testing

基　　金：中国科学院金属研究所技术创新项目(E1298502)。

摘　　要：材料在发生一级相变时,会伴随着热量和体积的同时突变。目前利用DSC/DTA方法基于热量变化来测试材料的熔点是主要采用的测试方法,但DSC/DTA测试方法中针对活性材料或熔点高于坩埚熔点的材料的测试存在一定的局限性。从材料一级相变时的体积变化入手,采用膨胀法对材料熔点测试进行初步研究。分别对纯金属、无限固溶合金、单晶等材料进行了膨胀法测试,并与DSC/DTA测试方法进行比较,数据吻合性好。试验结果表明,膨胀法能够准确测试材料初熔点,是对现有熔点测试方法的有益补充。When the material undergoes a first-order phase transition,it will be accompanied by the simultaneous mutations in heat and volume.At present,DSC/DTA method is mainly used to test the melting point of materials based on heat changes,but there are some limitations in DSC/DTA test method for active materials or materials with a melting point higher than the melting point of the crucible.Based on the volume change of material in the first-order phase transition,the expansion method was used to preliminarily study the melting point of the material.Pure metal,infinite solution alloy,single crystal and other materials were tested by expansion method,and the results were compared with DSC/DTA test method.It was found that the data were in good agreement.The results showed that the expansion method could accurately test the initial melting point of the material,which was a useful supplement to the existing melting point test method.

关 键 词：一级相变 膨胀法 初熔点 

分 类 号：TG115[金属学及工艺—物理冶金]