Li对7075铝合金钻杆材料微观组织与摩擦磨损行为的影响
Effects of Li on microstructure and friction and wear behavior of 7075aluminum alloy for drill pipe
查看参考文献23篇
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文摘
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采用热压烧结制备7075-(0%,0.5%,1%,2%,质量分数,下同)Li合金,研究Li对7075铝合金微观组织及摩擦磨损性能的影响。结果表明:7075-0.5Li合金在60kN烧结压力下致密度可达到99%以上。铝合金由α-Al相、η相和S′相组成;随着Li含量增加至2%,η相减少,δ′相、δ相增多,但α-Al仍为主相。铝合金的硬度和磨损率分别为71.25HV和3.50×10~(-3) mm~3·N~(-1)·m~(-1),随Li含量增加,铝锂合金硬度降低,磨损率升高,但7075-0.5Li比铝合金的硬度更高,磨损率更低。7075-Li合金均发生了氧化磨损,同时还发生了黏着磨损。铝锂合金随Li含量增加,η相减少,硬度降低, Al_2O_3脆性大从而与基体结合较弱,微观组织枝晶间距增大,导致合金由磨粒磨损逐渐转变为黏着磨损,耐磨性能逐渐降低。与铝合金相比,热压烧结制备的7075-0.5Li合金显示了更好的耐磨性能。 |
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其他语种文摘
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7075-(0%,0.5%,1%,2%,mass fraction)Li alloy was prepared by hot pressing sintering, and the effects of Li on microstructure and friction and wear behavior of 7075 Al alloy were investigated.The results show that the density of 7075-0.5Li alloy reaches above 99%at sintering pressure of 60kN.Al alloy consists ofα-Al,ηand S′phases.With the increase of Li content to 2%, theηphase decreases,δ′andδphases increase,butα-Al is still the main phase.The hardness and wear rate of Al alloy are 71.25HV and 3.50×10~(-3) mm~3·N~(-1)·m~(-1),respectively.As the Li content increases,the hardness of Al-Li alloy decreases and the wear rate increases.However,7075-0.5Li exhibits higher hardness and lower wear rate than those of Al alloy.Both oxidation wear and adhesion wear occurs in 7075-Li alloy.With the increase of Li content,theηphase is reduced,the hardness decreases,the brittleness of Al_2O_3is high which has a weak bonding with the matrix,and the dendrite spacing of microstructure widens,resulting in the transition from the abrasive wear to adhesive wear of the alloy,and therefore the wear resistance gradually decreases.Compared with Al alloy,7075-0.5Li alloy prepared by hot pressing sintering shows a better wear resistance. |
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来源
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材料工程
,2023,51(9):78-86 【核心库】
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DOI
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10.11868/j.issn.1001-4381.2022.000978
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关键词
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热压烧结
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铝锂合金
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微观组织
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磨损行为
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地址
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1.
江南大学机械工程学院, 江苏, 无锡, 214122
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江南大学, 江苏省食品先进制造装备技术重点实验室, 江苏, 无锡, 214122
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无锡锡钻地质装备有限公司, 江苏, 无锡, 214413
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1001-4381 |
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学科
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金属学与金属工艺 |
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基金
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国家自然科学基金项目
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江苏省自然科学基金
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文献收藏号
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CSCD:7574271
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