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真空吸滲擠壓制備2D-Cf/Al復合材料的組織和性能研究
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國家自然科學基金(51275417);國家自然科學基金群體項目(51221001);西北工業(yè)大學博士論文創(chuàng)新基金(CX201227)


Fabrication of 2D-Cf/Al Composite by an Extrusion Directly Following Vacuum Pressure Infiltration Technique and Its Microstructure and Properties
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    摘要:

    采用真空吸滲擠壓工藝制備了二維碳纖維增強鋁基(2D-Cf/Al)復合材料。在擠壓力(比壓)為60~90 MPa、真空度為10~30 kPa、浸滲擠壓溫度為580~620 ℃、保壓時間為60~120 s時,可以獲得浸滲充分和成形質(zhì)量良好的復合材料。微觀組織觀察分析表明,基體合金和碳纖維分布均勻,纖維無折斷、漂移現(xiàn)象,無明顯微觀缺陷。對Cf/Al復合材料進行密度和拉伸性能測試,其密度比基體合金降低17.9%,抗拉強度提高100%。熱處理實驗表明,經(jīng)過T6熱處理,基體合金的組織得到改善,內(nèi)部應(yīng)力和缺陷得到有效控制和消除,抗拉強度提高41%,而碳纖維和基體合金熱膨脹系數(shù)的差異會在復合材料內(nèi)部產(chǎn)生不良應(yīng)力,導致其拉伸性能沒有提高反而下降16%。

    Abstract:

    An extrusion directly following vacuum pressure infiltration technique was used to fabricate 2D-Cf/Al composite. When the specific pressure is 60~90 MPa, vacuum level is maintained at 10~30 kPa, squeeze infiltration temperature is 580~620 oC and keeping pressure time is 60~120 s, 2D-Cf/Al composite with ideal infiltration quality could be fabricated. Through microstructure observation, it is shown that the aluminum alloy is filled uniformly, and defects could be seldom found in composite. The experiment results indicate that the density of the composite is 17.9% lower than that of the matrix. Ultimate tensile strength of composite is satisfied, which is improved by 100% compared with that of matrix alloy. Heat treatment tests reveal the ultimate tensile strength is improved by 41%, because the microstructure is improved and the internal stress and defects are controlled effectively after heat treatment. On the contrary, the adverse stress would appear in the composite because of the difference of thermal expansion coefficient between carbon fiber and matrix alloy in the process of heat treatment, so the mechanical properties of the composite is decreased by 16%.

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馬玉欽,齊樂華,衛(wèi)新亮,鄭武強.真空吸滲擠壓制備2D-Cf/Al復合材料的組織和性能研究[J].稀有金屬材料與工程,2015,44(1):179~183.[Ma Yuqin, Qi Lehua, Wei Xinliang, Zheng Wuqiang. Fabrication of 2D-Cf/Al Composite by an Extrusion Directly Following Vacuum Pressure Infiltration Technique and Its Microstructure and Properties[J]. Rare Metal Materials and Engineering,2015,44(1):179~183.]
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  • 收稿日期:2014-01-24
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  • 在線發(fā)布日期: 2015-05-22
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