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[1] Li Fan, Huang Haibo, Chen Xin, Wang Dongjing, et al. Mechanical alloying and phase transformation in Fe-Si alloy [J]. Journal of Southeast University (English Edition), 2009, 25 (3): 404-407. [doi:10.3969/j.issn.1003-7985.2009.03.025]
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Mechanical alloying and phase transformation in Fe-Si alloy()
Fe-Si合金的机械合金化及其相变研究
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Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:
25
Issue:
2009 3
Page:
404-407
Research Field:
Materials Sciences and Engineering
Publishing date:
2009-09-30

Info

Title:
Mechanical alloying and phase transformation in Fe-Si alloy
Fe-Si合金的机械合金化及其相变研究
Author(s):
Li Fan;  Huang Haibo;  Chen Xin;  Wang Dongjing
Jiangsu Key Laboratory of Advanced Metallic Materials, Southeast University, Nanjing 211189, China
李凡;  黄海波;  陈鑫;  王东静
江苏省先进金属材料高技术研究重点实验室, 南京 211189
Keywords:
Fe-Si alloy;  mechanical alloying;  phase transformation;  α-FeSi2;  β-FeSi2
Fe-Si合金;  机械合金化;  相变;  α-FeSi2;  β-FeSi2
PACS:
TB34;TF124
DOI:
10.3969/j.issn.1003-7985.2009.03.025
Abstract:
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.
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α-FeSi2; 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.

References:

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Memo

Memo:
Biography: Li Fan(1958—), female, doctor, associate professor, sem@seu.edu.cn.
Citation: Li Fan, Huang Haibo, Chen Xin, et al. Mechanical alloying and phase transformation in Fe-Si alloy[J]. Journal of Southeast University(English Edition), 2009, 25(3): 404-407.
Last Update: 2009-09-20