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原位合成多元硼化物對(duì)Al0.5CoCrCuFeNiBx高熵合金硬度與耐磨性能的影響
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東北大學(xué),東北大學(xué),東北大學(xué),東北大學(xué),東北大學(xué),東北大學(xué)

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國(guó)家自然科學(xué)基金資助項(xiàng)目 (51205046)


Enhanced hardness and wear property by in-situ formation of mul-ti-component borides in Al0.5CoCrCuFeNiBx high-entropy alloys
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Northeastern University,Northeastern University,Northeastern University,Northeastern University,Northeastern University,Northeastern University

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    摘要:

    本文研究了Al0.5CoCrCuFeNiBx (x=0-1)的組織、相組成、硬度及耐磨性能。并預(yù)測(cè)了Al0.5CoCrCuFeNiBx (x=0-1)中簡(jiǎn)單固溶體形成規(guī)律。未添加硼元素的合金具有簡(jiǎn)單FCC固溶體結(jié)構(gòu)。添加硼元素后，合金由簡(jiǎn)單FCC固溶體及多元硼化物組成。硼以硼化物形式析出，沒有固溶到FCC固溶體中，因而添加硼對(duì)FCC固溶體的晶格常數(shù)無(wú)影響。硼化物的析出使合金的硬度提高，并且硬度隨著硼含量的增加而呈線性增加。當(dāng)硼含量x?0.4時(shí)，合多的磨耗阻變化不明顯，但當(dāng)硼含量x?0.6時(shí)，合金的磨耗阻抗隨著硼含量增加而呈線性增加。 隨著硼含量的增加，合金的磨損機(jī)制由粘著磨損轉(zhuǎn)變?yōu)檠趸p。合金硬度與耐磨性能的提高是高硬度的粗大硼化物與韌性的FCC固溶體基體共同作用的結(jié)果。

    Abstract:

    In this study, the microstructure, phase assemblages, hardness and wear properties of Al0.5CoCrCuFeNiBx (x=0-1) high-entropy alloys were investigated. The parameters representing simple solid-solution formation ability in Al0.5CoCrCuFeNiBx alloys were estimated. Without boron addition, the alloy was composed of simple FCC solid solution structure. With the addition of boron, the alloys were composed of borides and simple FCC solid solution matrix phase. Boron precipitated as borides instead of entering the crystal structure and thus there is no change in the lattice constant of the matrix FCC phase. Borides precipitation significantly hardens the alloy and the hardness showed a strong correlation to the boron content. There was no distinct difference in the wear resistance of the alloys with x?0.4, but the wear resistance showed a strong relation to the boron content in the alloys with x?0.6. With increasing boron content, the wear mechanism changes from delamination wear to oxidative wear. The great enhancement in the hardness and wear resistance is attributed to the combination of the large hard borides and relatively ductile and tough FCC matrix.

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劉曉濤,雷文斌,馬麗娟,劉金玲,劉靜,崔建忠.原位合成多元硼化物對(duì)Al0.5CoCrCuFeNiBx高熵合金硬度與耐磨性能的影響[J].稀有金屬材料與工程,2016,45(9):2201~2207.[Liu Xiaotao, Lei Wenbin, Ma Lijuan, Liu Jinling, Liu Jing, Cui Jianzhong. Enhanced hardness and wear property by in-situ formation of mul-ti-component borides in Al0.5CoCrCuFeNiBx high-entropy alloys[J]. Rare Metal Materials and Engineering,2016,45(9):2201~2207.]
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  • 收稿日期:2014-06-24
  • 最后修改日期:2014-12-02
  • 錄用日期:2015-02-06
  • 在線發(fā)布日期: 2016-10-09
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