4C/Al復(fù)合材料是目前最理想的中子吸收材料,廣泛用于乏燃料儲(chǔ)存。本文利用液態(tài)攪拌法制備B4C/Al復(fù)合材料,通過(guò)添加Ti元素,探討了界面反應(yīng)對(duì)材料的界面結(jié)構(gòu)和力學(xué)性能的影響。研究發(fā)現(xiàn),Ti元素通過(guò)參與界面反應(yīng),改變了界面結(jié)構(gòu),在B4C顆粒表面形成了緊密結(jié)合的納米TiB2界面層；Ti的添加消除了界面微裂紋、微孔、分離等缺陷。隨著界面反應(yīng)程度的加強(qiáng),材料強(qiáng)度提高,尤其反應(yīng)脫落的納米TiB2顆粒作為原位第二強(qiáng)化相進(jìn)一步增強(qiáng)基體。B4C/Al復(fù)合材料斷裂過(guò)程表現(xiàn)為韌窩延性斷裂；TiB2界面層增強(qiáng)了B4C顆粒與基體的結(jié)合,斷裂行為從B4C-Al界面脫落轉(zhuǎn)變?yōu)锽4C顆粒斷裂；但過(guò)渡的界面反應(yīng)會(huì)形成微韌窩,引起材料延伸率下降。"/>

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Ti 元素對(duì)B4C/Al復(fù)合材料力學(xué)性能的改善作用研究
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1.清華大學(xué)材料學(xué)院;2.中國(guó)核動(dòng)力研究設(shè)計(jì)院;3.中國(guó)核動(dòng)力研究設(shè)計(jì)院燃料及材料國(guó)家重點(diǎn)實(shí)驗(yàn)室;4.清華大學(xué)深圳研究生院;5.中廣核工程有限公司

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Improvement on mechanical property of B4C/Al composites by addition of Ti through interfacial reaction
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School of Materials Science and Engineering, Tsinghua University

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    摘要:

    B4C/Al復(fù)合材料是目前最理想的中子吸收材料,廣泛用于乏燃料儲(chǔ)存。本文利用液態(tài)攪拌法制備B4C/Al復(fù)合材料,通過(guò)添加Ti元素,探討了界面反應(yīng)對(duì)材料的界面結(jié)構(gòu)和力學(xué)性能的影響。研究發(fā)現(xiàn),Ti元素通過(guò)參與界面反應(yīng),改變了界面結(jié)構(gòu),在B4C顆粒表面形成了緊密結(jié)合的納米TiB2界面層；Ti的添加消除了界面微裂紋、微孔、分離等缺陷。隨著界面反應(yīng)程度的加強(qiáng),材料強(qiáng)度提高,尤其反應(yīng)脫落的納米TiB2顆粒作為原位第二強(qiáng)化相進(jìn)一步增強(qiáng)基體。B4C/Al復(fù)合材料斷裂過(guò)程表現(xiàn)為韌窩延性斷裂；TiB2界面層增強(qiáng)了B4C顆粒與基體的結(jié)合,斷裂行為從B4C-Al界面脫落轉(zhuǎn)變?yōu)锽4C顆粒斷裂；但過(guò)渡的界面反應(yīng)會(huì)形成微韌窩,引起材料延伸率下降。

    Abstract:

    A fine bonded interface is essential for the property of metal matrix composites. In this paper, an innovative method to strengthen boron carbide reinforced aluminum composites (B4C/Al composites) was studied by liquid stirring technology. The effect of interfacial reaction on the microstructure and mechanical behavior of B4C/Al composites was revealed by addition of Ti. Through B4C-Al melt interfacial reaction, Ti element strongly enriched at the interface. A dense and continuous nanoscale layer of TiB2 was formed on the surface of B4C particles. Interfacial modification was achieved by interfacial reaction. Due to the formation of TiB2 layer with good wettability and bonding, interfacial defects were eliminated. Increasing the degree of reaction, such as Ti content and reaction time, the strength of B4C/Al composites was gradually improved. Severe interfacial reaction introduced lots of nano-scale TiB2crystals into the matrix, which as in situ second reinforcement also improved the strength of B4C/Al composites. Fracture behavior of B4C/Al composites with different interfacial modification was discussed at last.

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阮晴,賈玉振,鄭繼云,李丘林,劉偉,束國(guó)剛. Ti 元素對(duì)B4C/Al復(fù)合材料力學(xué)性能的改善作用研究[J].稀有金屬材料與工程,2019,48(6):1777~1784.[ruanqing, jiayuzhen, zhengjiyun, liqiulin, liuwei, shuguogang. Improvement on mechanical property of B4C/Al composites by addition of Ti through interfacial reaction[J]. Rare Metal Materials and Engineering,2019,48(6):1777~1784.]
DOI：10.12442/j. issn.1002-185X.20180067

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  • 收稿日期:2018-01-19
  • 最后修改日期:2018-03-17
  • 錄用日期:2018-04-04
  • 在線發(fā)布日期: 2019-07-30
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