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氣相蒸發(fā)Ti-Fe系合金納米粉末相生成規(guī)律及尺寸效應(yīng)研究
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TG111.5

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國家自然科學(xué)基金（50304008）;博士點基金（20030532016）和博士后基金項目資助（2004035642）


Phase Formation Regularities and Size Effect of Ti-Fe Alloy Nanometer Powders by Gas Evaporation
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    摘要:

    采用電弧加熱蒸發(fā)法制備出粉末粒度在5nm～30nm的Ti-Fe系合金納米粉末，研究了納米粉末的相生成規(guī)律以及混合物粉末的尺寸效應(yīng)。實驗結(jié)果表明，納米粉末中化合物相的生成規(guī)律與Ti-Fe合金平衡相圖的不同。蒸發(fā)Fe含量大于73％（質(zhì)量分數(shù)，下同）的母合金時易得到FCC相和Fe2Ti相，而蒸發(fā)Ti含量大于47％的母合金易得到以FCC相和FeTi相為主的粉末，且所有粉末中FCC相含量最多。當(dāng)母合金中Fe含量為53％時，粉末中FeTi相的相對含量是所有粉末中最高的。只有在蒸發(fā)Ti含量為90％的母合盒所得的粉末中檢測到了少量Ti單質(zhì)相。FCC相的d（111）晶面間距隨母合金中Ti含量的增加而增加，說明FCC為固溶體相。DSC結(jié)果表明，納米粉末的平均熔點明顯低于粉末中各個合金相在平衡狀態(tài)下的熔點。

    Abstract:

    Ti-Fe alloy nanometer powders with particle size between 5 nm~30 nm were prepared by gas evaporation with arc as a heating source.The formation regularities of the phases and the melting point of the powers were investigated.The results indicate that the as-formed alloy phases in the nanometer powders are different from that in the Ti-Fe equilibrium phase diagram.FCC and TiFe2 phases were easily obtained when the master alloy rich in Fe was evaporated;by contrast,we gained FCC and TiFe phases when the master alloy rich in Ti were evaporated.The relative amount of the FCC phase is always the highest in all the powder samples.As the component of Fe in the master alloy is 53wt%,the relative amount of FeTi phase in the as-prepared powder was the highest among all the samples.A little amount of Ti phase was detected in the nanometer powders only when the Fe10Ti90 master alloy was evaporated due to the formation of the FCC phase.The lattice spacing of d(111) plane of FCC phase increased with the increase of Ti amount in the master alloys,which confirmed the solution of the Ti in the phase.The DSC curves showed that the mean melting points of these nanometer powders were lower than that of the as-formed alloy phases at equilibrium state.

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高偉麗 嚴紅革 盛紹頂 陳振華.氣相蒸發(fā)Ti-Fe系合金納米粉末相生成規(guī)律及尺寸效應(yīng)研究[J].稀有金屬材料與工程,2007,36(2):250~254.[Gao Weli, Yan Hongge, Sheng Shaoding, Chen Zhenhua. Phase Formation Regularities and Size Effect of Ti-Fe Alloy Nanometer Powders by Gas Evaporation[J]. Rare Metal Materials and Engineering,2007,36(2):250~254.]
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  • 最后修改日期:2005-11-29
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