CAJ | 학술논문

为了探讨机械合金化法制备Fe-Si合金的有效性,研究了Fe-Si的机械合金化及其相变.用扫描电子显微镜、X射线能谱仪和X射线衍射仪研究了Fe-si粉体的机械合金化过程,结果表明:球磨初期,韧性的Fe粉体磨成块状,脆性的Si粉体磨成小颗粒;随着球磨强度的增加,韧性的Fe粉体形成层片状而脆性的Si颗粒则分布在Fe的层片间或层片上;最后,Fe-Si粉体通过原子扩散实现机械合金化.因此,Fe,Si粉体在球磨机转速400 r/min、球料比40:1的条件下,球磨15 h可以合金化.机械合金化后的Fe-Si合金经过1 243 K退火1 h可得到单相的Ot-αFeSi2;机械合金化后的Fe-Si合金经过1 243 K退火1 h再冷却到1 073 K保温1 h可得到单相的β-FeSi2.因而,单相的α-FeSi2或β-FeSi2可通过对机械合金化的Fe-Si合金进行热处理获得.
위료탐토궤계합금화법제비Fe-Si합금적유효성,연구료Fe-Si적궤계합금화급기상변.용소묘전자현미경、X사선능보의화X사선연사의연구료Fe-si분체적궤계합금화과정,결과표명:구마초기,인성적Fe분체마성괴상,취성적Si분체마성소과립;수착구마강도적증가,인성적Fe분체형성층편상이취성적Si과립칙분포재Fe적층편간혹층편상;최후,Fe-Si분체통과원자확산실현궤계합금화.인차,Fe,Si분체재구마궤전속400 r/min、구료비40:1적조건하,구마15 h가이합금화.궤계합금화후적Fe-Si합금경과1 243 K퇴화1 h가득도단상적Ot-αFeSi2;궤계합금화후적Fe-Si합금경과1 243 K퇴화1 h재냉각도1 073 K보온1 h가득도단상적β-FeSi2.인이,단상적α-FeSi2혹β-FeSi2가통과대궤계합금화적Fe-Si합금진행열처리획득.
The Fe-Si mechanical alloying and its transformation are investigated to evaluate whether mechanical alloying is a useful process for producing Fe-Si alloy.The mechanical alloying process of Fe-Si powders is studied by SEM(scanning electron microscopy), EDS(energy dispersive spectrometer) and XRD(X-ray diffraction).The results show that the ball milling process first makes tough Fe powder a lump structure and brittle Si powder a small particle, and then as the mill power increases, the tough powder of iron with a lamellar structure forms and the Si particles lies on or between the Fe lamellas.Finally, the Fe and Si powders are mechanically alloyed through atom diffusion.So the Fe and Si powders can be alloyed by 15 h ball milling at a speed of 400 r/min and with a ball-to-powder ratio of 40 : 1.After heating at 1 243 K for 1 h, the milled powders transform to α-FeSi2, and after heating at 1 243 K for 1 h, then cooling to 1 073 K for 1 h, the milled powders transform to β-FeSi2.Therefore, the monophase α-FeSi2 or β-FeSi2 can be obtained by heat treatment of mechanically alloyed Fe-Si powders.