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熱等靜壓原位生成Al2O3顆粒強(qiáng)化Ti4AlN3復(fù)合材料
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沈陽(yáng)工業(yè)大學(xué),沈陽(yáng)工業(yè)大學(xué),沈陽(yáng)工業(yè)大學(xué)

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國(guó)家自然科學(xué)基金資助（51075199）；江蘇省普通高校研究生科研創(chuàng)新計(jì)劃項(xiàng)目（CXZZ11_0341）


In situ synthesis of Ti4AlN3 reinforced with Al2O3 particles by hot isostatic pressing
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Shenyang University of Technology, Shenyang, 110870,,

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    摘要:

    利用Al3Ti/TiN納米復(fù)合粉體在1280 ℃/150 MPa/1 h熱等靜壓條件下，制備出Al2O3/Ti4AlN3復(fù)合材料。利用XRD、SEM和TEM研究復(fù)合材料的形貌及成分。研究表明復(fù)合材料主要由片層結(jié)構(gòu)的Ti4AlN3基體和Al2O3顆粒增強(qiáng)相組成。Ti4AlN3基體的平均晶粒尺寸為7 μm；Al2O3顆粒的彌散分布，形狀不規(guī)則，粒度在1-3 μm，體積分?jǐn)?shù)約為27%。Al2O3/Ti4AlN3復(fù)合材料的強(qiáng)化機(jī)制為細(xì)晶強(qiáng)化和第二相粒子強(qiáng)化。Al2O3/Ti4AlN3復(fù)合材料與單相的Ti4AlN3材料相比，顯微硬度從2.5 GPa提高到6.7 GPa，常溫下最大壓縮強(qiáng)度從450 MPa提高到1 800 MPa，最大壓縮應(yīng)變由4%提高到6.2%。

    Abstract:

    Bulk intermetallic-ceramic composite Al2O3/Ti4AlN3 was fabricated by in-situ hot isostatic pressing of Al3Ti/TiN nanopowders under 1280 ℃/150 MPa/1 h conditions . The microstructure of composite were investigated by X-ray diffraction, SEM(Scanning Electron Microscope) and TEM(Transmission Electron Microscope). It is revealed that matrix Ti4AlN3 grains are strip-like and Al2O3 particles disperse in matrix uniformly with irregular shape. The averagegrain size of Ti4AlN3 is 7 μm. The size of Al2O3 particles are in the range of 1-3 μm, and volume fraction is about 40%. The Vickers hardness of Al2O3/Ti4AlN3 composite is 6.7GPa, maximal compressed strength is 1 800 MPa. Maximum compressive strain increased from 4% to 6.2%.Compared with the micro-hardness and compressed strength，Al2O3/Ti4AlN3 composite is higher than single Ti4AlN3 phase. The strengthening mechanisms of composite are fine grain strengthening and second phase strengthening.

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鄭卓,孫維民,劉正.熱等靜壓原位生成Al2O3顆粒強(qiáng)化Ti4AlN3復(fù)合材料[J].稀有金屬材料與工程,2016,45(7):1811~1815.[zhengzhuo, sunweimin, liuzheng. In situ synthesis of Ti4AlN3 reinforced with Al2O3 particles by hot isostatic pressing[J]. Rare Metal Materials and Engineering,2016,45(7):1811~1815.]
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  • 收稿日期:2013-06-21
  • 最后修改日期:2016-03-16
  • 錄用日期:2016-03-29
  • 在線發(fā)布日期: 2016-10-09
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