机械合金化合成TiB2/Fe3Al纳米复合粉体
Nanocrystalline TiB2/Fe3Al Composite Synthesized by Mechanical Alloying
摘 要
采用铁、铝、钛、硼四元粉体机械合金化与后续热处理的方法合成纳米TiB2/Fe3Al复合粉体,并利用XRD、DSC、SEM和TEM等对粉体进行了表征.结果表明：在球磨过程中,四元粉体形成了Fe(Al,Ti,B)过饱和固溶体,有序度不断降低,逐渐向非晶态转变,同时粉体晶粒尺寸逐渐细化,球磨40 h后Fe(Al,Ti,B)的晶粒尺寸为9.6 nm；并在热处理过程中Fe(Al,Ti,B)分解生成纳米Fe3Al和TiB2复合粉体,同时发生组成相晶粒生长,结构有序度提高等转变.
机械合金化
热处理
TiB2/Fe3Al nanocrystalline composite
mechanical alloying
heat-treatment
Abstract
Nanocrystalline TiB2/Fe3Al composite powders have been synthesized by mechanical alloying and subsequent heat-treatment of Fe-Al-Ti-B quaternary elemental powders.The microstructure and properties of the nanocrystalline powders were examined by X-ray diffractometer (XRD),differential scanning calorimetry(DSC),scanning electron microscopy(SEM),transmission electron microscopy(TEM) etc.The supersaturation solid solution of Fe(Al,Ti,B) was firstly formed and then transformed into an amorphous state during the milling process.The order degree and grain size were continuously decreased.After milling for 40 h,the crystalline size of the Fe(Al,Ti,B) solid solution was 9.6 nm.The composite powders were decomposited into Fe3Al and TiB2 nanocrystalline during subsequent heat-treatment.The grain size and structural order degree of Fe3Al and TiB2 increased during heat-treatment.
中图分类号 TG156
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收稿日期 2005/8/22
修改稿日期 2005/11/5
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备注李猛(1980-),男,安徽宿州人,硕士研究生.
引用该论文: LI Meng,TANG Wen-ming,ZHENG Zhi-xiang,TANG Hong-jun,WU Yu-cheng. Nanocrystalline TiB2/Fe3Al Composite Synthesized by Mechanical Alloying[J]. Materials for mechancial engineering, 2006, 30(9): 57～60
李猛,汤文明,郑治祥,唐红军,吴玉程. 机械合金化合成TiB2/Fe3Al纳米复合粉体[J]. 机械工程材料, 2006, 30(9): 57～60
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参考文献
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【4】Huang B,Ishihara K N,Shingu P H.Metastable phases of Al-Fe system by mechanical alloying[J].Mater Sci Eng A,1997,231:72-79.
【5】Kuang J P.Microstructures and mechanical properties of an investment cast gamma titanium aluminide[J].Mater Sci Technol,1999,15:840-850.
【6】Semiatin S L.Plastic-flow behavior and microstructural development in a cast alpha-two titanium aluminide[J].Metall Trans,1992,23A:295-305.
【7】Shah D M.Intermetallic compounds:structure and properties[J].JOM,1992,(2):6-7.
【8】Hiroshi K.Formation and characteristics of nano-crystalline TiAl[J].Mater Trans JIM,1995,36:982-987.
【9】Ko S H,Park B G,Hsahioto H,et al.Effect of MA on microstructure and synthesis path of in-situ TiC reinforced Fe-28at.%Al intermetallic composites[J].Mater Sci Eng A,2002,329-331:78-83.
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【12】Park B G,Ko S H,Park Y H.In Situ formation of TiC and TiB2 in the Fe3Al matrix by MA-PDS process[J].Journal of the Japan Society of Powder Metallurgy,2000,47(10):1080-1084.
【13】Kranowski M,Witek A,Kulik T.The FeAl-30%TiC nanocomposite produced by mechanical alloying and hot-pressing consolidation[J].Intermetallic,2002,(10):371-376.
【14】汤文明,郑治祥,吴玉程,等.机械合金化过程中的Fe75Al25二元系统的结构演变[J].材料热处理学报,2004,25(3):18-21.
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