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Acta Metall Sin  2013, Vol. 49 Issue (11): 1452-1456    DOI: 10.3724/SP.J.1037.2013.00521
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ORDERED STRUCTURE AND MECHANICAL PROPERTIES  OF  Fe-6.5%Si ALLOY FABRICATED BY RAPID QUENCHING
LI Hui 1), LIANG Yongfeng1), HE Ruiqi2), LIN Junpin1), YE Feng1)
1) State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing,Beijing 100083
2) Postal Scientific Research & Planning Academy, Beijing 100096
Cite this article: 

LI Hui, LIANG Yongfeng, HE Ruiqi, LIN Junpin, YE Feng. ORDERED STRUCTURE AND MECHANICAL PROPERTIES  OF  Fe-6.5%Si ALLOY FABRICATED BY RAPID QUENCHING. Acta Metall Sin, 2013, 49(11): 1452-1456.

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Abstract  

Fe-6.5%Si alloy is one excellent soft magnetic material. However, due to the appearance of ordered phases, this alloy is very brittle at room temperature and is very hard to be fabricated into thin sheet by conventional rolling process. In this work, continuous Fe-6.5%Si ribbons of 20 mm in width, and 35-50 μm in thickness were fabricated by rapid quenching technique. The ribbons exhibited good ductility compared with ordinary cast ingots. TEM and XRD were employed to analyze the ordering and microstructure of the ordinary cast ingots and the ribbons. The long range order parameters of B2 ordered phase in these two alloys were calculated. The results showed that the cast ingot contained amounts of B2 and D03 ordered phases, and had high degree of order. While in rapid quenched ribbons, the grains were extremely fine, the formation of D03 ordering was suppressed effectively and the growth of B2 was largely decreased. The decreased ordering content and degree of order in rapid quenched ribbons lowered the anti-phase boundary energy, leading to the reduction in slip resistance, which improved the mobility of superlattice dislocations, and then obviously enhanced the ductility of the alloy.

Key words:  Fe-6.5%Si alloy      rapid quenching      ordered phase      anti-phase boundary      TEM     
Received:  27 August 2013     

URL: 

https://www.ams.org.cn/EN/10.3724/SP.J.1037.2013.00521     OR     https://www.ams.org.cn/EN/Y2013/V49/I11/1452

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