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應(yīng)變誘導(dǎo)Ni原子在納米晶Fe中的擴(kuò)散行為研究
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重慶科技學(xué)院冶金與材料工程學(xué)院

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國(guó)家自然科學(xué)基金項(xiàng)目（面上項(xiàng)目，重點(diǎn)項(xiàng)目，重大項(xiàng)目）


Strain-induced Diffusion of Nickel in Nanocrystalline Fe Preduced by High Energy Shot Peening
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College of Metallurgy and Materials Engineering of Chongqing University of Science and Technology

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    摘要:

    利用高能噴丸法（HESP）在工業(yè)純鐵表面制備了一定厚度無污染、空位、雜質(zhì)等缺陷的納米晶層，其平均晶粒尺寸為50nm，厚度為100μm。在Gleebl 1500熱模擬機(jī)上，采用脈沖加壓擴(kuò)散(PPD)和恒定加壓擴(kuò)散(CPD)對(duì)納米晶鐵在850℃下進(jìn)行滲鎳處理。結(jié)果表明，鎳原子在納米晶鐵中的擴(kuò)散系數(shù)比常規(guī)粗晶中高1個(gè)數(shù)量級(jí)；而采用脈沖加壓擴(kuò)散時(shí)，鎳原子的擴(kuò)散系數(shù)要比采用恒壓擴(kuò)散高1個(gè)數(shù)量級(jí)。鎳原子擴(kuò)散系數(shù)的提高主要包括三個(gè)方面的原因，一是脈沖加壓能擊碎擴(kuò)撒界面上形成的阻礙鎳原子擴(kuò)散的金屬件化合物；二是納米晶鐵中形成的大量三叉晶界以及大量的非平衡晶界。

    Abstract:

    By means of high energy shot peening (HESP) to a pure iron cylinder, a nanocrystalline surface layer without oxidation, porosity and contamination was obtained. The thickness of the nanocrystalline surface layer was more than 100μm and the average grain size was about 50nm. The pulse pressure diffusion (PPD) and constant pressure diffusion (CPD) were used to diffuse nickel into nanocrystalline iron at 850℃ on Gleebl 1500 . Experimental results showed that diffusivity of Ni in the nanocrystalline Fe is 1 orders of magnitude higher than that in coarse-grained Fe and 1 orders of magnitude higher than that using CPD. The enhanced diffusivity of Ni may originate from the following three reasons : (1) pulse pressure can break the metalic compound formed during diffusing which may block the diffusion of Ni to inner nanocrystalline Fe; (2) a considerable amount of triple junctions and (3) a large volume fraction of non-equilibrium grain boundarie(GBs) in the present nanocrystalline Fe sample processed by means of the HESP technique.

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孫建春.應(yīng)變誘導(dǎo)Ni原子在納米晶Fe中的擴(kuò)散行為研究[J].稀有金屬材料與工程,2017,46(3):596~600.[sun jian chun. Strain-induced Diffusion of Nickel in Nanocrystalline Fe Preduced by High Energy Shot Peening[J]. Rare Metal Materials and Engineering,2017,46(3):596~600.]
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  • 收稿日期:2014-11-19
  • 最后修改日期:2015-03-17
  • 錄用日期:2015-06-11
  • 在線發(fā)布日期: 2017-05-18
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