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高強高導(dǎo)Cu-Nb微觀復(fù)合材料的尺寸效應(yīng)
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西北有色金屬研究院,西北有色金屬研究院

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國家自然科學(xué)基金項目（面上項目，重點項目，重大項目）


Size Effect on high strength and high conductivity Cu-Nb microcomposites
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Northwest Institute for Nonferrous Metal Research,Northwest Institute for Nonferrous Metal Research

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    摘要:

    高強度高電導(dǎo)Cu-Nb微觀復(fù)合材料具有納米結(jié)構(gòu)的Nb芯絲和純Cu層，材料的尺寸效應(yīng)促使力學(xué)性能呈規(guī)律變化。 本文通過不同線材尺寸的應(yīng)力應(yīng)變曲線測試研究了材料強度隨內(nèi)部Nb芯絲尺寸的變化規(guī)律，通過納米壓痕手段分析了材料彈性模量和納米壓痕值隨隨材料尺寸的變化特征。結(jié)果表明，材料的強度實測值遠大于混合定律計算的理論值，且隨Nb芯絲尺寸的減小強度呈指數(shù)增加，Nb芯絲納米硬度值也隨尺寸的減小顯著增加。與電子自由程相關(guān)的界面電子散射作用是影響材料電導(dǎo)的主要因素。

    Abstract:

    High strength and high conductivity Cu-Nb microcomposites are with nano-structured Nb fibers and pure Cu matrix. Strength size effect has been observed. The rule of strength changing with the size of Nb filaments was analyzed by stress-strain curves. The characteristics of elastic modulus and nano-indention hardness varying with the thickness of Nb filaments are investigated by nanoindentation. It is shown that the measured value of strength is considerably higher than that obtained by ROM and the UTS of Cu-Nb increases exponentially with the decreasing of dNb. Moreover, the nano-indention hardness of Nb filaments also increases greatly as the size dreased. It is believed that electronic interface scattering associated with the mean free path of the electrons is the main factor of Cu-Nb conductivity.

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梁明,李成山.高強高導(dǎo)Cu-Nb微觀復(fù)合材料的尺寸效應(yīng)[J].稀有金屬材料與工程,2017,46(3):699~703.[Liang Ming, Li Chengshan. Size Effect on high strength and high conductivity Cu-Nb microcomposites[J]. Rare Metal Materials and Engineering,2017,46(3):699~703.]
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  • 收稿日期:2014-10-27
  • 最后修改日期:2014-12-02
  • 錄用日期:2015-03-25
  • 在線發(fā)布日期: 2017-05-18
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