热性能分析对一种Al-Cu合金的相转变研究  

RESEARCH ON PHASE TRANSITION OF AN Al-Cu ALLOY BY THERMAL ANALYSIS

作　　者：吴玉丰[1,2] 刘克家[2] 张中可 李谦[1] 付伟英 

机构地区：[1]上海大学材料科学与工程学院,上海200072 [2]上海应用技术学院材料科学与工程学院,上海200233 [3]贵州华科铝材料工程技术研究有限公司,贵州贵阳550014

出　　处：《上海金属》2013年第3期27-30,共4页Shanghai Metals

摘　　要：运用热膨胀和差示扫描量热法(DSC)两种热性能分析试验研究了一种新型铸造Al-Cu合金固溶处理后的相转变。结果表明:热膨胀试验中,经固溶处理后的试样过饱和固溶体在190～250℃有一种相析出,在320～450℃析出相再溶解成单相固溶体;差示扫描量热法(DSC)试验结果显示,固溶处理后的试样在236℃有过饱和固溶体的析出。对比两种试验结果,热膨胀曲线更能灵敏地反映出此合金的相转变过程。The thermal expansion and differential scanning calorimetry （DSC） experiment of a kind of A1-Cu alloy after solid solution treatment were investigated by thermal analysis. Thermal expansion result showed that the expansion curve was obviously non-linear in two intervals of both 190 250 ℃ and 320 -450 ℃ for the samples after solution treatment which corresponded two phases transition processes of both precipitate and dissolving of precipitation of the alloy respectively. Furthermore, the result of differential scanning calorimetry （DSC） experiment showed that it had only one peak corresponding to the precipitate process of over-saturated solid solution. Compared with the results of the two experiments, one could obtain that thermal expansion was more sensitive for the phase transition processes of the alloy than that of the DSCg.

关 键 词：AL-CU合金 热膨胀 热效应 相转变 

分 类 号：TG146.21[一般工业技术—材料科学与工程]