(1. 蘇州有色金屬加工研究院, 蘇州 215026;
2. Unité de Thermique et d'Analyse Physique, Laboratoire d'Energétique et d'Optique, Université de Reims, BP 1039, 51687 Reims Cedex 2, France)
摘 要: 通過噴丸處理方法在純鈦表面形成一定厚度的超細(xì)晶組織(納米及亞微米組織), 利用掃描熱顯微鏡(SThM)對超細(xì)晶組織的熱性能進(jìn)行分析。 在實(shí)驗(yàn)基礎(chǔ)上建立理論模型。 根據(jù)從SThM掃描探針針尖傳輸?shù)皆嚇痈鞣N組織中的熱流變化, 分析材料的熱導(dǎo)率與組織的變化關(guān)系。 結(jié)果表明, 超細(xì)晶組織的熱導(dǎo)率與具有較大晶粒的基體相比有明顯的降低, 其原因主要與細(xì)晶組織中導(dǎo)電電子濃度的降低、 晶格缺陷密度的增加及電子與聲子在該類組織中的強(qiáng)烈散射有關(guān)。
關(guān)鍵字: 鈦; 噴丸處理; 超細(xì)晶組織; 熱導(dǎo)率
(1. Suzhou Institute for Nonferrous Metals Processing Technology,
Suzhou 215026, China;
2. Unité de Thermique et d'Analyse Physique, Laboratoire d'Energétique et d'Optique, Université de Reims, BP 1039, 51687 Reims Cedex 2, France)
Abstract: Scanning thermal microscopy (SThM) was used to analyze thermal properties of an ultrafine-grained titanium surface layer produced by ultrasonic shot peening. A theoretical approach, based on this experiment, was used to calculate the heat flow from the probe tip to the various microstructures in the sample. The results show that the thermal conductivity of the nanostructured surface layer decreases obviously compared with that of the coarse-grained matrix of the sample. This is mainly due to the decrease of electron concentration and strongly scattering of electrons and phonons in the ultrafine-grained structures.
Key words: titanium; ultrasonic shot peening treatment; ultrafine-grained microstructures; thermal conductivity


