2顆粒為原料,通過粉末冶金和熱軋制制備微米TiB2和納米Al2O3顆粒增強(qiáng)鋁基復(fù)合材料。室溫時(shí),由于TiB2和Al2O3的綜合強(qiáng)化作用,Al2O3/TiB2/Al復(fù)合材料的屈服強(qiáng)度和抗拉強(qiáng)度分別為258.7MPa和279.3MPa,測(cè)試溫度升至350℃時(shí),TiB2顆粒的增強(qiáng)效果顯著減弱,原位納米Al2O3顆粒與位錯(cuò)的交互作用使得復(fù)合材料的屈服強(qiáng)度和抗拉強(qiáng)度達(dá)到98.2MPa和122.5MPa。在350℃退火1000h后,由于納米Al2O3對(duì)晶界的釘扎作用抑制晶粒長大,強(qiáng)度和硬度未發(fā)生顯著的降低。隨著測(cè)試溫度上升,復(fù)合材料的主要斷裂機(jī)制從TiB2顆粒斷裂向顆粒與基體的界面解離轉(zhuǎn)變。"/>

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Al2O3/ TiB2/Al學(xué)性能復(fù)合材料的微觀結(jié)構(gòu)和高溫力學(xué)性能
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清華大學(xué)深圳國際研究生院

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廣東省重點(diǎn)領(lǐng)域研發(fā)計(jì)劃（項(xiàng)目編號(hào)2019B121204005）


Microstructure and elevated temperature mechanical properties of Al2O3/ TiB2/Al composites
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Affiliation:

1.Graduate School at Shenzhen,Tsinghua University;2.School of Materials Science and Engineering,Tsinghua University;3.State Key Laboratory of Nuclear Powder Engineering CoLtd

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Science and Technology Key Project of Guangdong Province, China (2019B121204005)

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    摘要:

    以細(xì)霧化鋁粉和TiB2顆粒為原料,通過粉末冶金和熱軋制制備微米TiB2和納米Al2O3顆粒增強(qiáng)鋁基復(fù)合材料。室溫時(shí),由于TiB2和Al2O3的綜合強(qiáng)化作用,Al2O3/TiB2/Al復(fù)合材料的屈服強(qiáng)度和抗拉強(qiáng)度分別為258.7MPa和279.3MPa,測(cè)試溫度升至350℃時(shí),TiB2顆粒的增強(qiáng)效果顯著減弱,原位納米Al2O3顆粒與位錯(cuò)的交互作用使得復(fù)合材料的屈服強(qiáng)度和抗拉強(qiáng)度達(dá)到98.2MPa和122.5MPa。在350℃退火1000h后,由于納米Al2O3對(duì)晶界的釘扎作用抑制晶粒長大,強(qiáng)度和硬度未發(fā)生顯著的降低。隨著測(cè)試溫度上升,復(fù)合材料的主要斷裂機(jī)制從TiB2顆粒斷裂向顆粒與基體的界面解離轉(zhuǎn)變。

    Abstract:

    Aluminum matrix composites reinforced with micro-TiB2 and nano-Al2O3 particles were successfully fabricated by combining powder metallurgy and hot rolling with raw materials of fine atomized aluminum powders and TiB2 particles. The Al2O3/TiB2/Al composites exhibited a yield strength of 258.7 MPa and an ultimate tensile strength of 279.3 MPa at 25 °C due to the comprehensive strengthening effect of TiB2 and Al2O3 particles. The strengthening effect of TiB2 particles was significantly weakened with temperature rising to 350 ℃, and the Orowan strengthening mechanism between nano-Al2O3 and dislocation made the yield strength and tensile strength of the composite material reach 98.2MPa and 122.5MPa. After annealing at 350 ℃ for 1000h, due to the pinning effect of nano-Al2O3 on grain boundaries, the grains growth were suppressed significantly and the strength and hardness did not decrease significantly. The main fracture mechanism of composites changed from brittle TiB2 particle fracture to interface debonding between TiB2 and the matrix from room temperature to elevated temperature.

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汪佳,劉偉,束國剛,李丘林. Al2O3/ TiB2/Al學(xué)性能復(fù)合材料的微觀結(jié)構(gòu)和高溫力學(xué)性能[J].稀有金屬材料與工程,2021,50(3):787~794.[Wang Jia, Liu Wei, Shu Guogang, Li Qiulin. Microstructure and elevated temperature mechanical properties of Al2O3/ TiB2/Al composites[J]. Rare Metal Materials and Engineering,2021,50(3):787~794.]
DOI：10.12442/j. issn.1002-185X. E20200004

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  • 收稿日期:2020-02-19
  • 最后修改日期:2020-03-05
  • 錄用日期:2020-03-19
  • 在線發(fā)布日期: 2021-04-02
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