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国家自然科学基金(51075293)

作品数:15 被引量:53H指数:4
相关作者:王文先崔泽琴葛亚琼许并社王鑫更多>>
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15 条 记 录,以下是 1-10
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镁合金表面等离子喷涂+激光重熔Al-Si基纳米Si_3N_4复合涂层被引量:4
2014年
为了改善镁合金表面的性能,将等离子喷涂和激光重熔技术相结合,利用5 kW横流连续CO2激光器,在AZ31B镁合金表面进行了激光重熔Al-Si+1%nano-Si3N4等离子喷涂复合涂层的试验研究。通过扫描电子显微镜、能谱分析仪、X射线衍射仪分析了重熔层的组织、成分分布和重熔前后的物相及结合界面,用显微硬度仪和电化学工作站测试并对比复合涂层重熔前后的硬度和腐蚀性能。结果表明,等离子喷涂层经激光重熔后与镁基体达到了良好的冶金结合,在激光作用下,重熔层析出的金属间化合物AlN、Mg2Si及弥散的铝硅固溶体强化相有效提高了其显微硬度,最高值达到514 HV0.05,是基体的10倍。在析出强化相作用下,重熔层的耐蚀性得到明显提高,自腐蚀电流较喷涂层和镁基体降低一个数量级。
王鑫王文先葛亚琼崔泽琴许并社
关键词:镁合金激光重熔纳米SI等离子喷涂
AZ31B镁合金表面几个熔覆Al-Si基纳米Si3N4的试验研究被引量:2
2015年
以变形镁合金AZ31B为试验基材,在其表面采用高功率CO2气体激光熔覆了A1-si基纳米si3N4粉末。采用金相观察、X射线衍射分析、能谱分析、硬度测试和腐蚀性能测试等手段,研究了激光熔覆层的微观组织结构及表面性能。研究结果表明,激光熔覆层主要由上部的树枝晶、中部呈线性排列的黑色相和下部的粗大树枝晶组成。当纳米氮化硅含量为1%时,熔覆层主要由Al、AlN、Al9Si和Mg2Si组成。熔覆层的硬度最高达到235HV0.05,是镁合金基体的4~5倍。熔覆层的耐腐蚀性能得到了改善,其腐蚀电位为-1204mV,比母材提高了382mV;腐蚀电流密度为0.0705mA·cm^-2,比母材降低了约一个数量级。
葛亚琼王文先崔泽琴王鑫
关键词:镁合金激光熔覆
镁合金表面激光熔覆Al-Si/Al_2O_3-TiO_2复合涂层界面特征及耐磨性被引量:15
2011年
为提高AZ31B镁合金表面的耐磨性,利用5 kW横流连续CO2激光器,配制了质量比为6…1的Al-Si/Al2O3-TiO2复合粉,在AZ31B镁合金表面进行了激光熔覆试验研究。通过光学显微镜(OM)、扫描电子显微镜(SEM)、X射线衍射(XRD)仪、能谱分析仪(EDS)分析了熔覆层的组织、界面结合及成分分布情况,并利用显微硬度仪、磨损试验机测试了熔覆层的表面性能。结果表明,激光熔覆复合涂层与基体达到了良好的冶金结合,结合界面清晰可见,XRD结果表明复合涂层由Mg17Al12、Al3Mg2、Mg2Si、Al2O3、TiO25种化合物组成;复合涂层最高硬度达245 HV0.05,比基体(50 HV0.05)提高了约4倍;由于陶瓷颗粒的镶嵌和镁铝金属间化合物的综合作用使得复合涂层的磨损性能也得到明显提高,磨损量比原始镁合金减少了81.4%。
崔泽琴王文先吴宏亮许并社
关键词:光学制造激光熔覆镁合金耐磨性
Improving the Wear Resistance of AZ31B Magnesium Alloy by Laser Cladding with Al-Si/Al_2O_3-TiO_2 Powders
2011年
To improve the wear resistance of magnesium alloy,the laser surface cladding of AZ31B magnesium alloy with Al-12 % Si and Al2O3-40 % TiO2 composite powders (in the wt.% ratio of 10:1,6:1,4:1) were investigated by using a 5kW continuous wave CO2 laser.A detailed microstructure and phase analysis of the surface modified layer were studied by optics microscopy(OM),scanning electron microscopy(SEM),energy dispersive spectroscopy (EDS),X-ray diffraction(XRD).The microstructure of the surface modified layers mainly consist of Al-Mg matrix,dendrite precipitates and Al2O3,TiO2 ceramic particles.The microhardness of the surface layer were measured and wear resistance property were evaluated in details.The average microhardness of the surface layers were significantly improved to 250HV0.05 as compared with 50HV0.05 of the AZ31B substrate.The results showed that the wear resistance of the laser surface modified samples was considerably improved as compared as the as-received specimen.
Cui Zeqin1,2,Wang Wenxian1,2,Wu Hongliang1,Xu Bingshe1,2 1Key Laboratory of Interface Science and Engineering in Advanced Materials (Taiyuan University of Technology),Ministry of Education,Taiyuan 030024,China 2College of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China
关键词:AZ31BCLADDINGPOWDERS
TIG熔覆+激光重熔法制备ZrAlNiCu非晶涂层(英文)被引量:2
2015年
为了解决传统激光熔覆非晶方法的不足,进行了TIG熔覆+激光重熔制备非晶涂层的尝试。在对Zr65Ni10Al7.5Cu17.5粉末进行TIG熔覆之后,又对熔覆层进行了激光重熔。TIG熔覆有利于与基材良好的结合、减少裂纹和气孔、有利于熔覆层成分的均匀化,激光重熔又可以提供极快的冷却速度并利于非晶的形成。随后对该涂层进行了微观组织、能谱、相组成、腐蚀性能及显微硬度的分析。整个涂层成分均匀,冶金结合良好,微观组织由晶体与非晶体组成,其中TIG熔覆+激光重熔涂层非晶体所占体积分数高于相同工艺下的传统激光熔覆层;该涂层显微硬度HV较传统激光熔覆层高1330 MPa;腐蚀电位较传统激光熔覆层高0.07 V,腐蚀电流更是降低了10倍以上。
关卓森王文先崔泽琴黎颖奇
关键词:激光重熔非晶锆基合金
碳钢表面激光熔覆Zr_(63.8)Ni_(17.2)Al_(11.4)Cu_(7.6)非晶合金(英文)被引量:2
2013年
一种新型的非晶形成能力的判据被成功应用于激光熔覆非晶领域,即e/a比例(平均原子价电子数)与Ra(平均原子尺寸)的判据。使用CO2激光器在碳钢表面熔覆了Zr63.8Ni17.2Al11.4Cu7.6与Zr65Ni10Al7.5Cu17.5粉末,并对熔覆层微观结构、相组成、显微硬度与腐蚀性能进行了研究。结果表明,熔覆层由晶体、非晶体组成,出现了一定量的氧化物与金属间化合物。Zr63.8Ni17.2Al11.4Cu7.6在熔覆中确实较传统的Zr65Ni10Al7.5Cu17.5体系具有更强的非晶形成能力,利于非晶涂层的制备。显微硬度明显提高,熔覆层中部的硬度是基材的3倍。耐腐蚀性能得到一定改善,虽腐蚀倾向上升但整体腐蚀程度得以下降。
关卓森王文先崔泽琴
关键词:激光熔覆非晶锆基合金碳钢
Study on Characteristics and Generation Mechanism of YAG Pulsed Laser Welding Cracks of AZ31B Magnesium Alloy
2011年
Due to poor metallurgical weldability of magnesium alloy,laser welding crack is still one of the main defects.The generations of welding crack seriously affected the weld quality and reduce the mechanical properties of welded joints which have become a bottleneck of the magnesium alloy products widely used in the structure materials.In this paper,AZ31B magnesium alloy sheet with 2mm thickness was used for this investigation.The forming reason and extending characteristics of the welding cracks were investigated during the Nd:YAG pulsed laser welding.The results show that welding cracks are mainly solidification crack which were always present in the weld centers.Few welding hot cracks appear multiple furcation phenomenons,and main and branch cracks were intercrystalline crack.The partial branch crack was mixed intercrystalline and transgranular extension.In addition,few cracks in the weld were caused due to irregular shape porosity and inclusion.The delayed crack weren't observed in the weld after deposited 48 hours.In the pre-process on the basis,the characteristics and generation mechanism of YAG pulsed laser welding cracks of magnesium alloy were analyzed further.
Cui Zeqin1,2,Wang Wenxian1,2,Si En1,Xu Bingshe1,21Key Laboratory of Interface Science and Engineering in Advanced Materials (Taiyuan University of Technology),Ministry of Education,Tai-yuan 030024,China2College of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China
关键词:AZ31BND:YAGPULSEDLASERLASERWELDINGWELDINGCRACKCRACK
Laser Cladding Al-Si/Al_2O_3-TiO_2 Composite Coatings on AZ31B Magnesium Alloy被引量:1
2012年
To improve the wear resistance and corrosion resistance of magnesium alloys, a 5 kW continuous wave CO2 laser was used to investigate the laser surface cladding on AZ31 B magnesium alloys with Al-Si/Al2O3-TiO2 composite powders. A detailed microstructure, chemical composition, and phase analysis of the composite coatings were studied by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and X-ray diffraction (XRD). The laser cladding shows good metallurgical bonding with the substrate. The composite coatings are composed of Mgl7Al12, Al3Mg2, Mg2Si, Al2O3, and TiO2 phases. Compared to the average microhardness (50HV0.05) of the AZ3 1 B substrate, that of the composite coatings (230HV0.05) is improved significantly. The wear resistances of the surface layers were evaluated in detail. The results demonstrate that the wear resistances of the laser surface-modified samples are considerably improved compared to the substrate. It also show that the composite coatings exhibit better corrosion resistance than that of the substrate in 3.5wt% NaCI solution.
崔泽琴YANG Hongwei王文先WU HongliangXU Bingshe
极速冷却下AZ31B镁合金表面激光熔凝处理的组织与性能研究被引量:2
2013年
被誉为"21世纪绿色工程材料"的镁及镁合金已成为继钢铁和铝材料之后的第三大金属工程应用材料,但较差的硬度、耐磨损性及耐腐蚀性在一定程度上制约了它的广泛应用。采用最大输出功率5 kW的HUST-JKT5170型横流CO2气体激光器对AZ31B镁合金表面进行激光熔凝处理,同时对熔凝层的正面和背面进行液氮极速冷却,对该条件下的冷却速度进行计算,并分别从显微组织、物相、显微硬度和腐蚀性能等方面对比分析了原始镁合金和极速冷却熔凝层。研究结果表明:激光+液氮的冷却条件下,熔化层的冷却速度v=324.9 K/s;熔化层冷却并凝固后没有裂纹、气孔等缺陷。微观上,极速冷却的熔凝层的晶粒大小远小于原始镁合金,且晶界已不明显;与母材的过渡处微观组织呈现典型的白亮的平面晶形态,从底部到顶部,熔凝层的晶粒尺寸逐渐减小;熔凝层主要由α-Mg相组成,而β-Mg17Al12相的衍射峰强度相对于原始镁合金极大地弱化。主要受细晶强化作用,极速冷却的熔凝层的显微硬度提高到140 HV0.05,是原始镁合金(约50 HV0.05)的2.8倍。在质量分数为3.5%的NaC(lpH=7)溶液中的电化学腐蚀发现,该极速冷却条件下获得的熔凝层的腐蚀电流为3.889×10-4A,高于原始镁合金的1.470×10-5A,且腐蚀电位为-1.483 V,低于原始镁合金的-1.438 V,说明该极速冷速条件下熔凝层的耐腐蚀性能略差于原始镁合金。
郭谡葛亚琼王文先崔泽琴许并社
关键词:AZ31B镁合金激光熔凝
镁合金表面激光熔覆Al-Si基纳米SiC复合涂层的组织及性能被引量:3
2012年
纳米材料由于其结构的特殊性,具有一般材料难以获得的优异性能,为了将纳米材料的优异性能应用到镁合金表面改性当中,利用横流CO_2激光器在AZ31B镁合金基体上制备了Al-Si合金粉末+5%纳米SiC粉末复合涂层,采用光学显微镜、扫描电子显微镜观察了熔覆层的显微组织并分析了微区成分分布情况,激光熔覆层与基体结合良好,熔覆层的显微组织具有明显的结构特征,出现了大量的十字架结构。X射线衍射结果表明,激光熔覆层的组成相主要为Mg_2Si、Mg_2C_3、Mg_(17)Al_(12)、A_(l3.21)Si_(0.47)等。利用显微硬度仪进行了硬度测试,由于在激光熔覆过程中新形成的化合物起到了强化作用,熔覆层的最高显微硬度可达216 HV0.2,是基体的3倍多。
冯辉崔泽琴王文先葛亚琼
关键词:镁合金激光熔覆
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