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W-Ni-Fe系機械合金化過程中的相變及熱力學和動力學研究
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TG146.4

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Studies on Thermodynamic and Kinetic and Phase Evolution of W-Ni-Fe Powder during Mechanical Alloying
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    摘要:

    W,Ni,Fe粉末按照91.16W6.56Ni2.28Fe的成分配比進行機械合金化(MA)。用XRD確定物相,用TEM(JEM-2000CX型)觀察微觀形貌和顯微結(jié)構(gòu)。并對機械合金化粉末的物相、顆粒尺寸、晶格畸變作了分析討論。MA可以使W-Ni-Fe系形成納米晶超飽和固溶體和非晶。參照Miedema半經(jīng)驗理論模型,計算了該合金系的相變驅(qū)動力,熱力學分析指出該合金系不存在發(fā)生非晶化反應(yīng)的化學驅(qū)動力。應(yīng)用固態(tài)反應(yīng)模型解釋了MA過程非晶形成的熱力學可能性,在MA過程中,非晶的形成并不絕對要求體系ΔHmix<<0和DB>>DA

    Abstract:

    W6.56Ni2.28Fe tungsten heavy alloy from the elemental powders of W, Ni and Fe was mechanically alloyed(MA). Phase was defined by XRD. Microstructure was observed by TEM (JEM-2000 type). Phase evaluation, grain size and lattice distortion of these powders were determined and discussed. And nano-crystalline supersaturated solid solutions and amorphous were prepared by MA. A thermodynamic model was developed based on Miedema semi-experimental theory to calculate the driving force for phase evolution. The thermodynamic analysis showed that there is no chemical driving force to form amorphous alloys. The model of multilayer amorphization during MA was applied to illustrate the feasibility of amorphization of powder with neither ?Hmix << 0 nor DB >DA

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張中武,周敬恩,席生岐,李鵬亮,張文興,冉廣. W-Ni-Fe系機械合金化過程中的相變及熱力學和動力學研究[J].稀有金屬材料與工程,2004,33(10):1045~1048.[Zhang Zhongwu, Zhou Jingen, Xi Shengqi, Li Pengliang, Zhang Wenxing, Rang guang. Studies on Thermodynamic and Kinetic and Phase Evolution of W-Ni-Fe Powder during Mechanical Alloying[J]. Rare Metal Materials and Engineering,2004,33(10):1045~1048.]
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  • 最后修改日期:2003-03-03
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