2O3p/7075鋁基構(gòu)型復(fù)合材料。研究了真空與非真空下不同燒結(jié)溫度、不同擠壓比對(duì)復(fù)合材料微觀組織、致密度、彈性模量、硬度和壓縮強(qiáng)度的影響。結(jié)果表明：隨燒結(jié)溫度升高,擠壓比4:1與8:1構(gòu)型復(fù)合材料的硬度皆為先增加后降低,整體相對(duì)基體材料硬度均明顯提高；復(fù)合材料經(jīng)過(guò)擠壓過(guò)后材料的致密度均在98 %以上；擠壓比4:1,燒結(jié)溫度為620℃、630 ℃、640℃時(shí),相對(duì)于基體復(fù)合材料抗壓強(qiáng)度分別提高了15.3%,17.2%,14.0%,隨溫度先增大后降低；擠壓比8:1時(shí),相對(duì)基體復(fù)合材料抗壓強(qiáng)度分別提高了33.2%,34.1%,31.1%,強(qiáng)度隨溫度先增大后降低。而構(gòu)型復(fù)合材料綜上實(shí)驗(yàn)中彈性模量變化不大。"/>

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燒結(jié)工藝及熱擠壓對(duì)納米Al2O3p/7075鋁基構(gòu)型復(fù)合材料組織與性能的影響
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作者單位:

昆明理工大學(xué)材料與科學(xué)工程學(xué)院

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中圖分類號(hào):

TB333

基金項(xiàng)目:

國(guó)家自然科學(xué)基金(619220180039).,


Effects of sintering process and hot extrusion on Microstructure and properties of Nano-Al2O3 / 7075 Aluminum Matrix Composites
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School of Materials and Science Engineering,Kunming University of Science and Technology

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    摘要:

    采用粉末冶金與熱擠壓工藝制備了 10 wt%納米Al2O3p/7075鋁基構(gòu)型復(fù)合材料。研究了真空與非真空下不同燒結(jié)溫度、不同擠壓比對(duì)復(fù)合材料微觀組織、致密度、彈性模量、硬度和壓縮強(qiáng)度的影響。結(jié)果表明：隨燒結(jié)溫度升高,擠壓比4:1與8:1構(gòu)型復(fù)合材料的硬度皆為先增加后降低,整體相對(duì)基體材料硬度均明顯提高；復(fù)合材料經(jīng)過(guò)擠壓過(guò)后材料的致密度均在98 %以上；擠壓比4:1,燒結(jié)溫度為620℃、630 ℃、640℃時(shí),相對(duì)于基體復(fù)合材料抗壓強(qiáng)度分別提高了15.3%,17.2%,14.0%,隨溫度先增大后降低；擠壓比8:1時(shí),相對(duì)基體復(fù)合材料抗壓強(qiáng)度分別提高了33.2%,34.1%,31.1%,強(qiáng)度隨溫度先增大后降低。而構(gòu)型復(fù)合材料綜上實(shí)驗(yàn)中彈性模量變化不大。

    Abstract:

    10 wt% Nano-Al2O3 / 7075 aluminum matrix composites were prepared by powder metallurgy and hot extrusion. The effects of sintering temperature and extrusion ratio on microstructure, density, elastic modulus, hardness and compressive strength of the composites were studied. The results show that: with the increase of sintering temperature, the hardness of the composites with extrusion ratio of 4:1 and 8:1 increases at first and then decreases, and the overall hardness of the composites increases obviously; the compactness of the composites after extrusion is more than 98%; the compactness of the composites after extrusion is 4:1, the sintering temperature is 620 ℃, 630 ℃ When the extrusion ratio is 8:1, the compressive strength of the composite increases by 33.2%, 34.1% and 31.1%, which increases first and then decreases with temperature. In conclusion, the elastic modulus of the composites has little change.

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顏慶華,徐志凱,盧德宏.燒結(jié)工藝及熱擠壓對(duì)納米Al2O3p/7075鋁基構(gòu)型復(fù)合材料組織與性能的影響[J].稀有金屬材料與工程,2021,50(10):3729~3738.[Yan Qinghua, Xu Zhikai, Lu Dehong. Effects of sintering process and hot extrusion on Microstructure and properties of Nano-Al2O3 / 7075 Aluminum Matrix Composites[J]. Rare Metal Materials and Engineering,2021,50(10):3729~3738.]
DOI：10.12442/j. issn.1002-185X.20200825

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  • 收稿日期:2020-10-26
  • 最后修改日期:2020-12-21
  • 錄用日期:2021-02-03
  • 在線發(fā)布日期: 2021-10-28
  • 出版日期: 2021-10-25