SLM成形AlSi10Mg合金及SiC/AlSi10Mg复合材料的耐蚀和耐磨性能
Anti-corrosion and wear resistance properties of AlSi10Mg alloy and SiC/AlSi10Mg composites fabricated by selective laser melting
查看参考文献18篇
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文摘
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利用SLM成形制备SiC/AlSi10Mg复合材料,采用XRD,SEM,EDS,EBSD,电化学方法和摩擦磨损实验分析其物相特征、微观组织和耐蚀、耐磨性能,并与SLM成形AlSi10Mg合金进行对比。结果表明:在3.5%(质量分数)NaCl溶液中,SLM成形SiC/AlSi10Mg试样的腐蚀电流密度(2.0827 μA/cm~2)小于SLM成形AlSi10Mg试样的腐蚀电流密度(3.389 μA/cm~2),同时SLM成形SiC/AlSi10Mg试样表面钝化膜的厚度(7.1 nm)大于AlSi10Mg试样表面钝化膜的厚度(1.9 nm),说明SLM成形SiC/AlSi10Mg试样耐蚀性能更优。究其原因为,SiC加入后引起晶粒细化、大角度晶界比例增多及铝基体连续性破坏,进而导致腐蚀速率减缓,耐蚀性能增强。此外,与SLM成形AlSi10Mg合金的硬度(103.58±7.41)HV0.2相比,SLM成形SiC/AlSi10Mg复合材料的硬度(207.68±16.02)HV_(0.2)大约是前者的2倍,硬度明显提高,耐磨性能增强;SLM成形AlSi10Mg和SiC/AlSi10Mg的磨损机制均以磨料磨损和氧化磨损为主。 |
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其他语种文摘
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The SiC/AlSi10Mg composites were fabricated via selective laser melting(SLM). The phase characteristics, microstructure, anti-corrosion and wear resistance properties of SLM SiC/AlSi10Mg and SLM AlSi10Mg samples were investigated by XRD, SEM, EDS, EBSD, electrochemical test, and friction and wear test. The results show that in the 3.5% (mass fraction) NaCl solution, the corrosion current density of SLM SiC/AlSi10Mg (2.0827 μA/cm~2) is lower than that of SLM AlSi10Mg (3.389 μA/cm~2), and the passivation film on the surface of SLM SiC/AlSi10Mg (7.1 nm) is thicker than that of SLM AlSi10Mg(1.9 nm), indicating the SLM SiC/AlSi10Mg sample has better corrosion resistance than that of SLM AlSi10Mg. The reason can be attributed to that the addition of SiC causes the grain refinement, the increase of high grain boundary, and the interruption of the continuity of Al matrix, leading to the decrease of corrosion rate and the increase of corrosion resistance. In addition, the average microhardness for SLM SiC/AlSi10Mg composites (207.68±16.02)HV0.2 is twice that of SLM AlSi10Mg alloy(103.58±7.41)HV_(0.2), indicating its hardness and wear resistance are improved. Both the wear mechanisms of SLM AlSi10Mg and SiC/AlSi10Mg composites are mainly abrasive wear and oxidation wear. |
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来源
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材料工程
,2024,52(10):97-105 【核心库】
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DOI
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10.11868/j.issn.1001-4381.2023.000435
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关键词
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激光选区熔化
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SiC/AlSi10Mg复合材料
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腐蚀
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耐磨性
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地址
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1.
重庆理工大学材料科学与工程学院, 重庆, 400054
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中国科学院重庆绿色智能技术研究院, 智能增材制造技术与系统重庆市重点实验室, 重庆, 400714
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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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一般工业技术;金属学与金属工艺 |
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基金
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重庆市教委项目
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文献收藏号
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CSCD:7840337
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