铝镁锌共晶合金的热分析研究  

THERMAL ANALYTICAL INVESTIGATIONS OF Al-Mg-Zn EUTECTIC ALLOY

作　　者：孙建强[1] 钟润萍[1] 

机构地区：[1]广东水利电力职业技术学院,广州510635

出　　处：《理化检验（物理分册）》2007年第3期112-116,120,共6页Physical Testing and Chemical Analysis(Part A:Physical Testing)

基　　金：国家自然科学基金资助项目(59876010)

摘　　要：利用差示扫描量热仪（DSC）和H-90型膨胀仪，对潜热储能材料Al—34％Mg-6％Zn和Al-28%，5Mg-14%Zn合金的热物性参数——固液态时的比热容、30-500℃间的质量密度、熔化温度和熔化潜热等进行了测定。测试结果表明，两种合金的熔化温度和熔化潜热分别为454和447℃及314．4和303．2kJ／kg。从室温加热到熔化温度时，两种合金的密度分别减少1.05％和1．09％。在相变之前，两种合金的比热容随温度的升高而增大，在445℃时，分别为1368．5和1203．6J／（kg·K）。在相变过程中，由于熔化潜热的原因，合金的比热容变化很大。对合金组元和合金相对热物性参数的影响进行了讨论。The thermo-physical properties of Al-34% Mg-6% Zn （in wt.%） and Al-28%Mg-14%Zn alloys used for thermal energy storage applications, such as the specific heat capacity including solid and liquid state; the mass density in the temperature range 30 - 500℃ ;the melting temperature and the latent heat of fusion were determined by differential scanning calorimetry （DSC） and H-90 type Dilatometer. The test results showed that the melting temperature and latent heat of fusion for the two alloys were 454, 447℃ and 314. 4, 303. 2kJ/kg, respectively. The density of the two alloys heated from room temperature to melting temperature were decreased by 1.05%, 1. 09%, respectively. The specific heat capacity of the two alloys were growing with the temperature increasing before the beginning of phase change, and were 1368. 5, 1203. 6J/（kg · K）at 445℃, respectively. The change of specific heat capacity were great due to existing of latent heat of fusion during the phase transformation process. The mechanism of alloy compositions and phases＇s effection on these properties were also discussed in this paper.

关 键 词：铝合金 比热容 熔化潜热 质量密度 热分析 

分 类 号：O657.99[理学—分析化学]