激光选区熔化纳米SiC/AlSi_7Mg复合材料微观组织及力学性能
Microstructure and mechanical properties of nano-SiC/AlSi_7Mg composites fabricated by selective laser melting
查看参考文献29篇
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文摘
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采用机械混合法制备纳米SiC/AlSi_7Mg混合粉末,利用激光选区熔化技术(selective laser melting,SLM)成形纳米SiC颗粒增强AlSi_7Mg复合材料,观察和分析试样的相对密度、物相和微观组织,并测试材料的硬度和拉伸性能。结果表明:SLM成形纳米SiC/AlSi_7Mg复合材料试样的相对密度随着扫描速度和扫描间距的增大均呈现先增加后减少的趋势,相对密度最高可达99.75%;试样微观组织与SLM成形铝合金相似,Si相呈网状结构均匀嵌入α-Al基体中,且在Al基体中存在与Si分布相似的纳米SiC团聚物及Mg_2Si相;与AlSi_7Mg相比,复合材料微观组织由柱状晶转化为等轴晶,且晶粒明显细化(平均晶粒尺寸为1.36μm);由于SiC的加入,产生细晶强化和固溶强化,试样的硬度和强度均明显提高,硬度最高达到137.3HV,抗拉强度达到448.3MPa,屈服强度达到334.7MPa,但伸长率下降至3.9%,断裂模式主要为脆性断裂。 |
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其他语种文摘
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The nano-SiC/AlSi_7Mg mixed powder was prepared by mechanical mixing method.The specimens of nano-SiC particle reinforced AlSi_7Mg composite were fabricated by selective laser melting (SLM).The relative density,phase and microstructure were observed and analyzed,and the microhardness and tensile properties were tested.The results show that the relative densities of SLM nano-SiC/AlSi_7Mg composite are increased firstly and then decreased with the increase of scanning speed and scanning space,and the maximum relative density reaches 99.75%.The microstructure of specimens is similar to that of SLMformed Al-Si alloys,and the network-structured Si phase is uniformly embedded in theα-Al matrix.There are nano-SiC agglomerates and Mg_2Si phase in theα-Al matrix,which has a similar distribution to Si. Compared with AlSi_7Mg,the microstructure of specimens is changed from columnar to equiaxed grain,and the grains are significantly refined(the average grain size is 1.36μm).Due to the addition of SiC,grain refinement strengthening and solid solution strengthening are produced,and the hardness and strength of composite are significantly improved.The hardness,tensile strength and yield strength reach 137.3HV,448.3 MPa and 334.7 MPa,respectively.However,the elongation is reduced to 3.9%,and the fracture mode is mainly brittle fracture. |
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来源
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材料工程
,2022,50(12):143-151 【核心库】
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DOI
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10.11868/j.issn.1001-4381.2021.001016
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关键词
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激光技术
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激光选区熔化
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铝基纳米复合材料
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微观组织
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力学性能
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地址
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1.
中国民航大学安全科学与工程学院, 天津, 300300
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中国民航大学中欧航空工程师学院, 天津, 300300
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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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中国民航大学中央高校基本科研业务费专项
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文献收藏号
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CSCD:7398787
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