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石墨烯增強(qiáng)TC4復(fù)合材料的微觀組織及力學(xué)性能
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國(guó)家自然科學(xué)基金青年基金項(xiàng)目(51605249); 凝固技術(shù)國(guó)家重點(diǎn)實(shí)驗(yàn)室(西北工業(yè)大學(xué))開放課題資助項(xiàng)目(SKLSP201828); 陜西省教育廳科研計(jì)劃項(xiàng)目(19JK0458); 陜西省科技廳國(guó)際合作計(jì)劃項(xiàng)目(2019KW-026)


Microstructure and Mechanical Properties of Graphene Reinforced TC4 Composites
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    摘要:

    采用球磨法將石墨烯與TC4預(yù)合金粉末混合,通過放電等離子燒結(jié)工藝在1 200℃制備了石墨烯/TC4復(fù)合材料。采用掃描電子顯微鏡、X射線衍射儀等研究了復(fù)合粉末混合前后的形貌和物相結(jié)構(gòu);采用顯微硬度計(jì)、Gleeble-3800D熱模擬試驗(yàn)機(jī)等分析了復(fù)合材料的顯微硬度和壓縮性能。結(jié)果表明:通過干法球磨和放電等離子燒結(jié)工藝制備的復(fù)合材料組織致密,石墨烯與TC4原位生成的TiC在晶界處析出,提高了復(fù)合材料的力學(xué)性能。復(fù)合材料的室溫壓縮強(qiáng)度和屈服強(qiáng)度,相對(duì)于基體分別提高了17.03%和12.5%;硬度和延伸率分別提高了18.2%和60%。石墨烯的加入使得TC4基體晶粒細(xì)化,同時(shí)與基體反應(yīng)生成了TiC顆粒,對(duì)基體產(chǎn)生了強(qiáng)化效果。

    Abstract:

    Graphene and TC4 prealloyed powders were mixed by ball milling method. Then, spark plasma sintering(SPS) process was applied at 1 200 ℃ to fabricate graphene/TC4 composites. The morphology and phase structure of the composite powder were investigated by scanning electron microscopy(SEM) and X-ray diffraction(XRD). The microhardness and compression performance of the composites was also analyzed by microhardness tester and Gleeble-3800 D. The results show that the graphene/TC4 composites are compact and graphene and TiC generated in situ from TC4 precipitate at the grain boundaries, which improves the mechanical properties of the composites. The compression strength and yield strength of the composites at room temperature are increased by 17.03% and 12.5% compared with the matrix. Hardness and elongation are increased by 18.2% and 60% respectively. The addition of graphene refines the grain and reacts with the matrix to generate TiC particles, which enhanced the matrix.

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.石墨烯增強(qiáng)TC4復(fù)合材料的微觀組織及力學(xué)性能[J].鈦工業(yè)進(jìn)展,2019,36(6):7-12.

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  • 在線發(fā)布日期: 2020-02-17
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