Fe_3Al合金中D0_3有序化过程的场离子显微镜研究  

FIM STUDY ON (D0)3 ORDERING IN Fe3Al ALLOY

作　　者：翁军[1] 朱逢吾[1] 王文东[1] 职任涛[1] 张得志[1] 肖纪美[1] 

机构地区：[1]北京科技大学,北京科技大学材料物理系

出　　处：《金属学报》1996年第11期1154-1158,共5页Acta Metallurgica Sinica

基　　金：国家自然科学基金;高等学校博士学科点专项科研基金

摘　　要：经５００℃保温５天有序化处理得到的Ｄ０３结构Ｆｅ３Ａｌ，其场离子显微镜（ＦＩＭ）像具有十分发达的环结构，但〈１１１〉极环结构的清晰程度明显低于〈１００〉极．连续观察可以发现，〈１００〉极的场蒸发过程简洁，而〈１１１〉极较复杂．分析表明，经这种有序化处理后，Ｄ０３结构下的ＳＩ型有序已趋于完成，而ＳＩＩ型有序尚未完成．在同一温度下，即使延长保温时间，〈１１１〉极衬度也未有明显好转，表明在５００℃下处理得到的Ｄ０３有序结构并不完整．Samples of Fe3Al with (D0)3 structure after annealing at 500℃ for 5 days were studied with field-ion microscope (FIM). Although the overall FIM ring structures of the treated Fe3Al are much developed, the ring structure of <111> pole is rather confused while that of the <100> pole is very clear. By successive observation, it was found that the <100> pole has a simple field evaporation sequence, while the <111> pole possesses a rather complicated one. This indicates that the ordering of type SI occurred in the (D0)3 order transformation tends to end, but the ordering of type SII is not completed.Prolonging the annealing time to 20 days under the same temperature did not result in a better <111> pole contrast.

关 键 词：场离子显微镜 有序化 金属间化合物 铁铝合金 

分 类 号：TG131[一般工业技术—材料科学与工程]