第37卷第5期 2016年10月
·新材料制备与性能·
热处理技术与装备
RECHULI JISHU YU ZHUANCBEI
高压扭转对铁合金组织和性能的影响
王梦得，康鹏超，武高辉，许鲁江，张孟孟
（哈尔滨工业大学材料科学与工程学院，黑龙江哈尔滨150001）
Vol.37,No.5 Oct,2016
摘要：综述了应用高压担转(HPT)技术的铁亿合金组织和性能的变化。研究结果表明，经过HPT 后的铁纪合金能获得致密度较好的纳米级晶粒，呈大角度晶界。由于塑性变形导致其硬度明显增加，且由于应变的不同分布使硬度值从中心到边缘呈上升势；经过HPT处理后的晶粒与晶粒间Y 元素的加入可以有效地在火过程中抑制晶粒的长大。根据VSM的测定得出软磁材料具有很高的饱和磁感应强度、较低的矫顽力和较小的磁滞回线面积，经过HPT处理后的晶粒能够获得更大的饱和磁感应强度；随着Y原子含量的增加，高压扭转铁基纳米晶软磁材料的比饱和磁感强度减小，矫
顽力增大。然而，随着退火温度的升高，比饱和磁感强度增大，矫顽力减小。关键词：高压扭转(HPT)；铁基纳米晶；细化晶粒；显微组织；软磁材料；磁性能
中图分类号：TG113.25文献标志码：A
文章编号：1673-4971(2016)05-0026-04
EffectsofHighPressureTorsiononMicrostructure
andPropertiesofYttriumIronAlloy
WANG Meng-de,KANG Peng-chao,WU Gao-hui, XU Lu-jiang,ZHANG Meng-meng
(School of Materials Science and Engineering, Harbin Institute of Technology,Harbin Heilongjiang 150001,China)
Abstract: The change of microstructure and properties of yttrium iron alloy processed by HPT technique is summarized ,The results show that yttrium iron alloy can get the nanoscale grains with better density after HPT to present the large angle grain boundaries. Plastic deformation leads to significant increase of hard-ness which its value increases from center to edge due to the different distribution of strain. Grain after HPT treatment and adding Y element between grains can effectively inhibit grain growing up during annea-ling. Soft magnetic material has very high saturation flux density, lower coercivity and smaller hysteresis loop area according to the result measured by VSM, and grains can get greater saturation flux density after HPT. With Y atom content increases, specific saturated magnetic induction intensity of nanocrystalline soft magnetic material after HPT decreases, and the coercivity increases. However, with the annealing temper-ature increasing, the specific saturation magnetic induction intensity increases and the coercivity decrea-ses.
Key words: high pressure torsion (HPT) ; iron based nanocrystalline; grain refinement; microstructure; soft magnetic materials; magnetic
研究者们对材料磁性的研究一直给予了很大
的关注，众所周知，磁性是材料的基本属性之一，也
收稿日期：2016-01-07
作者简介：王梦得（1991.9-），女，硕士研究生，主要从事热防护材料方面研究。
联系电话：18945091681;E-mail：wmd_hit@163.com
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