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国家自然科学基金(11002121)

作品数:10 被引量:28H指数:2
相关作者:潘勇周兆锋李玮惠建科张敏捷更多>>
相关机构:湘潭大学教育部更多>>
发文基金:国家自然科学基金湖南省科技重大专项国家教育部博士点基金更多>>
相关领域:金属学及工艺理学化学工程一般工业技术更多>>

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10 条 记 录,以下是 1-10
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Effect of heat treatment on tensile deformation behavior of Ni-Co film/Fe substrate systems被引量:1
2012年
The effects of heat treatment on microstructure and tension property of Ni-Co film/Fe substrate systems were investigated. The deformation and fracture morphologies of Ni-Co films/Fe substrate systems were studied by in-situ scanning electron microscopy(in-situ SEM)before and after heat treatment.The results show that a Ni-Co/Fe diffusion layer appears between the film and substrate after heat treatment;the elongation of film/substrate system increases with increasing the heat treatment temperature. Both the strength and ductility of the film/substrate system are preferable when heat treatment temperature is 650 o C,meanwhile the maximum elongation is up to 46%.During tensile deformation,the deformation behaviors of Ni-Co film/Fe substrate are quite different before and after heat treatment.The samples after heat treatment went through the progress of holes’emergence,growth and extension,whereas the samples without heat treatment accompanied with no holes,just cracked instead,showing that appropriate heat treatment is helpful to improve the toughness of material,and mechanical properties.
张敏捷潘勇周兆锋李玮惠建科雷维新
关键词:FRACTURE
铝带镀镍液中柠檬酸钠浓度对镀层延伸性及耐蚀性的影响被引量:1
2011年
铝带应用广泛,但其焊接性能差、耐腐蚀性能不好。为此,在瓦特体系镀镍液中添加柠檬酸钠,采用直流电镀方法在铝带表面镀镍,研究了柠檬酸钠浓度对镀镍铝带表面形貌、相结构、延伸率及耐腐蚀性能的影响。结果表明:镀镍液中添加柠檬酸钠可以细化镍镀层的晶粒,影响晶面择优取向;镀镍铝带的延伸率、耐蚀性随柠檬酸钠浓度的增加而先增加后降低,柠檬酸钠浓度为40.0 g/L时镀镍铝带的延伸率最大,柠檬酸钠浓度为60.0 g/L时镀镍铝带的耐蚀性最强。
杜超朱岭唐伦圆周兆锋潘勇
关键词:柠檬酸钠耐蚀性
Mesoscopic superelasticity,superplasticity,and superrigidity被引量:3
2012年
Atomic-undercoordination-induced local bond contraction,bond strength gain,and the associated temperature (T)-dependent atomic-cohesive-energy and binding-energy-density are shown to originate intrinsically the exotic paradox of superplasticity,superelasticity,and superrigidity demonstrated by solid sizing from monatomic chain to mesoscopic grain.The paradox follows these relationships:(ε(K,T)y(K,T)σ(K,T))∝(exp(B/△T_(mk)),(η_1△T_(mk))d~(-3),[1+AK~(-2/2)exp(△T_(mk)/T)]△T_(mk)d~(-3)),(Plastic strain)(Elastic modulus)(Yield stress,IHPR)where A,B,η1,d and△T_(mk)=Tm(K) Tare size (K)-dependent physical parameters.Tm (K) is the melting point.Mechanical work hardening during compressing and self-heating during stretching modulate the measured outcome extrinsically.Superplasticity dominates in the solid-quasimolten-liquid transition state.The competition between the accumulation and annihilation of dislocations activates the inverse Hall-Petch relationship.Therefore,it is essential for one to discriminate the intrinsic competition between the local bond energy density gain and the atomic cohesive energy loss from the extrinsic factors of pressure and temperature in dealing with atomistic mechano-thermo dynamics.
MA ZengShengZHOU ZhaoFengHUANG YongLiZHOU YiChunSUN ChangQing
镍-钴/镍/镍-钴镀层的制备及电化学性能被引量:1
2012年
采用直流和脉冲方法电沉积了镍-钴/镍/镍-钴多层镀层。通过SEM对镍-钴/镍/镍-钴镀层的微观结构进行了表征,采用Tafel曲线外推法、交流阻抗法、阳极极化曲线法等方法对镍-钴/镍/镍-钴镀层在0.1mol/L H2SO4和1%NaCl混合溶液及10%NaOH溶液中的耐腐蚀性能进行了表征。结果显示:镍-钴/镍/镍-钴镀层的表面致密均一;在0.1 mol/L H2SO4+1%NaCl溶液中的腐蚀电位最正,传质电阻最大达到1 642Ω·cm2;在10%NaOH中钝化区为542 mV,具有较好的钝化效果。
王建兴黄少军唐伦圆惠建科周兆锋潘勇
关键词:直流电沉积脉冲电沉积镍-钴合金耐腐蚀性能
An accelerated scheme with high quality mesh based on Lloyd iteration被引量:1
2012年
High quality mesh plays an important role for finite element methods in science computation and numerical simulation.Whether the mesh quality is good or not,to some extent,it determines the calculation results of the accuracy and efficiency.Different from classic Lloyd iteration algorithm which is convergent slowly,a novel accelerated scheme was presented,which consists of two core parts:mesh points replacement and local edges Delaunay swapping.By using it,almost all the equilateral triangular meshes can be generated based on centroidal Voronoi tessellation(CVT).Numerical tests show that it is significantly effective with time consuming decreasing by 40%.Compared with other two types of regular mesh generation methods,CVT mesh demonstrates that higher geometric average quality increases over 0.99.
秦衡峰王艺李明富周后明
镍-钴合金镀钢带及其制成的锂电池钢壳的耐腐蚀性能被引量:2
2012年
用于锂电池壳体制备的预镀镍工艺会使钢壳表面有大量裂纹,耐蚀性下降。通过3种方式在钢带上镀覆镍-钴合金层,并冲压制成电池钢壳,采用扫描电镜(SEM)、能谱、X射线衍射(XRD)、电化学测试、中性盐雾试验、硫酸铜点滴试验研究了镀覆钢带和电池钢壳的组织结构和耐腐蚀性能。结果表明:电镀2μm镍-钴合金层经700℃热处理3 h后再加镀2μm镍-钴合金层制备的钢带表层致密均匀,加镀的薄膜封闭了热处理后晶粒间存在的位错等缺陷产生的针孔,具有良好的耐腐蚀性能;电镀4μm镍-钴合金层经700℃热处理3 h制备的钢带冲压而成的电池钢壳表面裂纹少且细小,裂纹处为镍/钴/铁固溶体,耐腐蚀性能明显优于其他2种方式制备的钢壳。
李玮潘勇张敏捷周兆锋堵艳艳惠建科
关键词:耐腐蚀性能
热处理温度对镀镍钴钢带耐腐蚀性能的影响被引量:2
2012年
对镀镍钴钢带进行不同温度的热处理,热处理温度为550℃、650℃、750℃,保温时间3h。采用电化学方法测试了不同热处理温度下镀镍钴钢带在1.0%NaCl和0.1%H2SO4混合溶液及10%NaOH溶液中的耐腐蚀性能,并通过扫描电子显微镜(SEM)、能谱分析仪(EDS)和X射线衍射仪(XRD)分析了镀镍钴钢带在不同热处理温度下的微观形貌、成分及织构变化。结果表明,随着热处理温度的升高,镀镍钴钢带表面镀层的晶粒尺寸逐渐长大,镀层和基底间形成了镍/钴/铁扩散层;当热处理温度为650℃时,镀镍钴钢带在1.0%NaCl和0.1%H2SO4混合溶液及10%NaOH溶液中的耐腐蚀性能均为最好的,当热处理温度超过650℃后其耐腐蚀性能降低。这说明合适的热处理温度能有效地提高镀层的耐腐蚀性能。
张敏捷潘勇李玮周兆锋黄少军朱经涛
关键词:热处理温度镍钴合金耐腐蚀性能
电沉积镀镍层的无铬钝化工艺被引量:1
2012年
采用正交试验法筛选了一种以植酸、钼酸钠和缓蚀添加剂为基本组成的无铬钝化液。通过电化学阻抗谱测试,确定了最佳成膜时间;通过5%CuSO4点滴试验、10%NaCl浸泡试验和极化曲线测试,对电沉积镀镍层无铬钝化后的耐蚀性能进行了研究。结果表明,采用本无铬钝化工艺后,镀镍层耐蚀性能良好。
堵艳艳潘勇周兆锋李玮惠建科
关键词:镀镍层耐腐蚀无铬钝化
叠层结构对Cu/In预制膜微观结构的影响
2013年
采用超声波-脉冲直流电沉积的方法在钼基底上制备了两种不同叠层结构的Cu/In预制膜:Cu/In多层膜和Cu/In双层膜,经过随后的热处理得到了Cu/In合金膜。通过XRD、SEM等对比研究了这两种Cu/In预制膜热处理前后的表面形貌、成分和相结构特征。结果表明:采用Cu/In多层膜制备的Cu/In合金膜表面更致密、平滑,成分分布更均匀,所用的热处理时间短且显著减少了In元素的挥发损失,更利于薄膜原子比的精确控制。
陈浩潘勇周兆锋田槟铖李旭军李凯
关键词:电沉积叠层结构CU
Finite Element Simulation on Thermal Fatigue of a Turbine Blade with Thermal Barrier Coatings被引量:16
2014年
In this paper, a finite element model was developed for a turbine blade with thermal barrier coatings to investigate its failure behavior under cyclic thermal loading. Based on temperature and stress fields obtained from finite element simulations, dangerous regions in ceramic coating were determined in terms of the maximum principal stress criterion. The results show that damage preferentially occurs in the chamfer and rabbet of a turbine blade with thermal barrier coatings and its thermal fatigue life decreases with the increase of thermal stress induced by high service temperature.
L.YangQ.X.LiuY.C.ZhouW.G.MaoC.Lu
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