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Friction and Wear Performance of in-Situ (TiC+TiB)/Ti6Al4V Composites 原位(TiC+TiB)/Ti6Al4V复合材料的摩擦磨损性能
IF 0.7 4区 材料科学 Q3 Materials Science Pub Date : 2018-12-01 DOI: 10.1016/S1875-5372(19)30008-6
Bai Xue, Jin Yunxue, Lu Xuan, Chen Yanan

(TiC+TiB)/Ti6Al4V composites with different TiC and TiB contents were prepared by in situ synthesis. The influence of load on the dry sliding friction and wear performance of in-situ (TiC+TiB)/Ti6Al4V composites (TMC) was studied by HT-1000 friction and wear testing machine, and the wear behavior of the composites was also investigated by scanning electron microscopy (SEM) and Bruker 3D profilometer. The results show that the wear resistance of TMC is improved by the formation of TiC and TiB phases compared to the Ti6Al4V matrix. For the composites with different volume fractions of reinforcing phases, the wear rate and wear depth increase with the increase of the applied load, and the friction coefficient decreases and fluctuates within a small range. Under low loads, the worn surface is covered with grooves and a small amount of wear debris; under heavy loads, the worn surface is covered with narrow and shallow grooves and a large amount of wear debris. The wear mechanism is abrasive wear and oxidation wear. As the load increases, the size of the debris increases.

采用原位合成方法制备了TiC和TiB含量不同的(TiC+TiB)/Ti6Al4V复合材料。利用HT-1000摩擦磨损试验机研究了载荷对原位(TiC+TiB)/Ti6Al4V复合材料(TMC)干滑动摩擦磨损性能的影响,并利用扫描电镜(SEM)和Bruker 3D型面仪研究了复合材料的磨损行为。结果表明:与Ti6Al4V基体相比,通过TiC相和TiB相的形成,TMC的耐磨性得到了提高;对于含有不同体积分数增强相的复合材料,磨损率和磨损深度随外加载荷的增加而增加,摩擦系数减小并在小范围内波动。在低载荷下,磨损表面覆盖有沟槽和少量磨损碎屑;在重载荷作用下,磨损表面覆盖有窄而浅的沟槽和大量的磨损碎屑。磨损机理为磨粒磨损和氧化磨损。随着载荷的增大,碎片的尺寸也随之增大。
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引用次数: 5
Undercooling and Microstructure of Gas Atomized Ni-based Superalloy Powders ni基高温合金气体雾化粉末的过冷及显微组织
IF 0.7 4区 材料科学 Q3 Materials Science Pub Date : 2018-12-01 DOI: 10.1016/S1875-5372(19)30005-0
Chen Shiqi , Lu Zhi , Wang Guangxin

Atomization is an effective approach to obtain fine and spherical alloy powders. Undercooling is an important factor that can affect the property of powders during atomization. The effects of powder size and cooling rate on the undercooling and microstructure of powders were investigated, and the relation between powder size, cooling rate and undercooling was obtained through DSC. The results show that a small powder size and a low cooling rate will result in a large undercooling. Meanwhile, it is found that when the undercooling is large, the dendrite arm spacing of the particles decreases. The smaller the powder size, the greater the proportion of cellular grains, and the finer the grain size of the powders.

雾化是制备微细球形合金粉末的有效方法。过冷度是影响粉末雾化性能的一个重要因素。研究了粉末粒度和冷却速度对粉末过冷度和显微组织的影响,并通过DSC得到了粉末粒度、冷却速度和过冷度之间的关系。结果表明,粉末粒度小,冷却速度慢,过冷度大。同时,当过冷度较大时,晶粒的枝晶臂间距减小。粉末粒度越小,细胞颗粒所占比例越大,粉末粒度越细。
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引用次数: 3
Microstructure and Mechanical Property Development in a Hot-rolled and Annealed Mg-5Li-1Al Alloy Sheet 热轧退火Mg-5Li-1Al合金板材组织与力学性能的发展
IF 0.7 4区 材料科学 Q3 Materials Science Pub Date : 2018-12-01 DOI: 10.1016/S1875-5372(19)30011-6
Li Ruihong , Chen Zhijun , Jiang Bin , Pan Fusheng

Mg-5Li-1Al magnesium alloy sheets processed by hot rolling were annealed at 150 and 300 °C for 30 min. The microstructure, mechanical properties, and texture of the rolled and annealed Mg-5Li-1Al alloy sheet were investigated. The plastic deformation mechanism was also discussed. The results show that the annealed sheet possesses weak basal texture and homogenous recrystallized structure with grain size of ∼15 μm. Increasing annealing temperature results in an increase in tensile elongation and a decrease in tensile strength, yield strength and yield ratio, which generally favor the improvement of sheet formability. The rolled LA51 sheet after annealing at 300 °C exhibits improved mechanical properties due to Li addition and high annealing temperature.

将热轧后的Mg-5Li-1Al镁合金板材在150℃和300℃下退火30 min,研究了轧制和退火后的Mg-5Li-1Al镁合金板材的组织、力学性能和织构。讨论了塑性变形机理。结果表明:退火后的薄片具有较弱的基体织构和均匀的再结晶组织,晶粒尺寸为~ 15 μm;提高退火温度,拉伸伸长率提高,拉伸强度、屈服强度和屈服比降低,总体上有利于板材成形性的改善。在300℃退火后,由于Li的加入和较高的退火温度,轧制后的LA51板的力学性能得到了改善。
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引用次数: 1
Preparation and Characterization of Boron-Doped Nanodiamond 掺硼纳米金刚石的制备与表征
IF 0.7 4区 材料科学 Q3 Materials Science Pub Date : 2018-12-01 DOI: 10.1016/S1875-5372(19)30010-4
Yan Xianrong , Li Xiaojie , Wang Xiaohong , Yan Honghao

Boron-doped nanodiamond was prepared by a high-temperature vacuum-diffusion method. Thermogravimetric analysis, X-ray photoelectron spectroscopy, X-ray diffraction (XRD), Fourier-transform infrared spectroscopy, Raman spectroscopy, and transmission electron microscopy were used to characterize the prepared material. Results show that the product mainly contains C, O, and B in mass fractions of 92.08%, 7.14%, and 0.78%, respectively. In addition to diamond (111)D and (220)D diffraction peaks, hexagonal diamond (100)D diffraction peaks are also observed in the XRD pattern of the boron-doped product. The introduction of B atoms increases the defect content in the nanodiamond and causes the Raman G peak to move to 1620 cm−1. B atoms are mainly present in two forms in the diamond lattice: substitutional carbon atoms in C-B bonds, and being bonded with impurity elements (such as B-O). The shape and morphology of the boron-doped nanodiamond particles (particle size of detonation nanodiamond, 2∼10 nm) exhibit no obvious changes compared to the pristine nanodiamond. However, a small amount of cubic diamond is observed. In conclusion, the initial oxidation temperature of the boron-doped nanodiamond increases by 175 °C, the oxidation rate is slower, and the thermal stability is improved.

采用高温真空扩散法制备了掺硼纳米金刚石。利用热重分析、x射线光电子能谱、x射线衍射(XRD)、傅里叶变换红外光谱、拉曼光谱和透射电镜对制备的材料进行了表征。结果表明,该产品主要含C、O和B,质量分数分别为92.08%、7.14%和0.78%。在掺硼产物的XRD图谱中,除了金刚石(111)D和金刚石(220)D衍射峰外,还观察到六角形金刚石(100)D衍射峰。B原子的引入增加了纳米金刚石中的缺陷含量,导致拉曼G峰移动到1620 cm−1。B原子在金刚石晶格中主要以两种形式存在:在C-B键上取代碳原子,与杂质元素(如B- o)成键。与原始纳米金刚石相比,掺硼纳米金刚石(爆轰纳米金刚石粒径为2 ~ 10 nm)的形状和形貌没有明显变化。然而,观察到少量的立方金刚石。综上所述,掺硼纳米金刚石的初始氧化温度提高了175℃,氧化速率减慢,热稳定性提高。
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引用次数: 1
Improved Mechanical Properties of Additive Manufactured Ti-6Al-4V Alloy via Annealing in High Magnetic Field 增材制备Ti-6Al-4V合金强磁场退火后力学性能的改善
IF 0.7 4区 材料科学 Q3 Materials Science Pub Date : 2018-12-01 DOI: 10.1016/S1875-5372(19)30017-7
Zhao Ruifeng , Li Jinshan , Zhang Ying , Li Peixuan , Wang Jiaxiang , Zou Cheng-xiong , Tang Bin , Kou Hongchao , Gan Bin , Zhang Liang , Wang Jun , William Yi Wang

A novel magnetic-field-driving approach was proposed and used to efficiently enhance the mechanical properties of selective laser melting (SLM) Ti-6Al-4V. The microstructures of the as-built and the SLM specimens annealed at 400, 800 °C below the β transus, and 1200 °C above the β transus for 30 min in the high magnetic field of 7 T were comprehensively characterized in terms of X-ray diffraction, optical microscope, scanning electron microscope, and atomic force microscope. Lattice distortions induced by Al and V atoms were characterized by bonding charge density, providing an insight into the atomic and electronic basis for the solid solution strengthening mechanism and the martensitic transformation mechanism. Referring to the as-built specimens, the ultimate tensile strength and the elongation of annealed specimens at 400 and 1200 °C in 7 T high magnetic field increase due to the short annealing time. Based on the coupling effect of force field induced by the heat and magnetic, it is expected that the microstructures of SLM Ti-6Al-4V would be conventionally optimized through changing the phase transformation thermodynamics. The validation of this hypothesis will pave a path to develop a novel magnetic-field-driving approach efficiently enhancing the mechanical properties of additive manufactured materials.

提出了一种新的磁场驱动方法,用于提高Ti-6Al-4V选择性激光熔化(SLM)的力学性能。采用x射线衍射、光学显微镜、扫描电镜和原子力显微镜等手段,对制备的样品和SLM样品在7 T强磁场下分别在β横截面下400℃、800℃和β横截面上1200℃退火30 min后的微观结构进行了全面表征。Al和V原子引起的晶格畸变由成键电荷密度表征,为固溶体强化机制和马氏体转变机制提供了原子和电子基础。在7t高磁场下,400°C和1200°C退火试样的极限抗拉强度和伸长率均因退火时间短而提高。基于热磁感应力场的耦合效应,期望通过改变相变热力学来优化Ti-6Al-4V合金的微观组织。这一假设的验证将为开发一种新的磁场驱动方法铺平道路,该方法可以有效地提高增材制造材料的机械性能。
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引用次数: 4
High-temperature Sulfidation and Oxidation Behavior of Plasma-sprayed Al-Mo Coatings 等离子喷涂Al-Mo涂层的高温硫化和氧化行为
IF 0.7 4区 材料科学 Q3 Materials Science Pub Date : 2018-12-01 DOI: 10.1016/S1875-5372(19)30006-2
Wu Liangmin , Wang Weize , Yu Jingye , Huang Jibo , Li Chaoxiong

Gas burner is the key component of coal-water slurry gasifier system. However, due to the sulfidation at high temperature, gas burner often fails in advance, which affects the stable operation of the system. In this work, Al-Mo coatings were deposited by plasma spraying with a Mo bonding layer. The sulfidation and oxidation behavior of the Al-Mo coatings was studied and compared with those of Mo coatings and Inconel 600 alloy at 973, 1073 and 1173 K. Results show that both the high-temperature sulfidation resistance and the high-temperature oxidation resistance of Al-Mo coatings are superior to those of Mo coatings. The high temperature sulfidation resistance of coatings is better than that of Inconel 600 alloy. Plasma-sprayed Al-Mo coatings with a Mo bonding layer are promising candidates for the corrosion protection of steels in a sulfur/oxide-rich atmosphere.

燃气燃烧器是水煤浆气化炉系统的关键部件。但由于高温下的硫化,燃气燃烧器往往会提前发生故障,影响系统的稳定运行。在本研究中,采用等离子喷涂的方法制备了Al-Mo涂层。研究了Al-Mo涂层在973、1073和1173 K下的硫化氧化行为,并与Mo涂层和Inconel 600合金的硫化氧化行为进行了比较。结果表明,Al-Mo涂层的耐高温硫化性能和耐高温氧化性能均优于Mo涂层。涂层的耐高温硫化性能优于Inconel 600合金。带有Mo键合层的等离子喷涂Al-Mo涂层是在富硫/氧化物大气中对钢进行防腐的有希望的候选者。
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引用次数: 1
First-principles Study on Effect of Pressure and Temperature on Mechanical, Thermodynamic Properties, and Electronic Structure of Ni3Al Alloy 压力和温度对Ni3Al合金力学、热力学和电子结构影响的第一性原理研究
IF 0.7 4区 材料科学 Q3 Materials Science Pub Date : 2018-12-01 DOI: 10.1016/S1875-5372(19)30013-X
Niu Xiaofeng , Huang Zhiwei , Yan Peiwen , Wang Baojian , Song Zhenliang , Wang Chenchen , Zhao Jingyu , Bo Yanqiang

The influence of temperature and pressure on the electronic, elastic, structural, and thermodynamic properties of Ni3Al alloy was investigated by performing a first-principles study. The calculated elastic constants, equilibrium lattice constants, and elastic modulus agree well with the recorded theoretical and experimental data. The calculated elastic constants indicate that C11 is more sensitive than C12 and C44 to pressure. The Young’s modulus, bulk modulus, and shear modulus increase with the increase of pressure. The ratio of bulk to shear modulus (B/G) and anisotropy factor A were also analyzed. The Debye temperature was obtained by calculating the elastic constants, and it changes with the change in the pressure. The thermal expansion coefficient, normalized volume, heat capacity, bulk modulus, and Debye temperature ΘD were determined and analyzed using the quasi-harmonic Debye model at pressures of 0∼60 GPa and temperatures of 0∼1600 K. Finally, the density of states and Mulliken population were investigated and the effect of pressure on these was analyzed.

采用第一性原理研究了温度和压力对Ni3Al合金电子、弹性、结构和热力学性能的影响。计算得到的弹性常数、平衡晶格常数和弹性模量与理论和实验数据吻合较好。计算的弹性常数表明,C11比C12和C44对压力更敏感。杨氏模量、体积模量和剪切模量随压力的增大而增大。分析了材料的体积剪切模量比(B/G)和各向异性因子A。通过计算弹性常数得到德拜温度,该温度随压力的变化而变化。在压力为0 ~ 60 GPa、温度为0 ~ 1600 K的准谐波Debye模型下,对热膨胀系数、归一化体积、热容、体积模量和Debye温度ΘD进行了测定和分析。最后,研究了状态密度和Mulliken种群密度,并分析了压力对它们的影响。
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引用次数: 0
Numerical Simulation of the Influence of Electrode Shrinkage Cavity on ESR Process of IN718 Alloy 电极缩孔对IN718合金电渣重熔过程影响的数值模拟
IF 0.7 4区 材料科学 Q3 Materials Science Pub Date : 2018-12-01 DOI: 10.1016/S1875-5372(19)30002-5
Wang Zixing , Qing Li , Wang Lei

Numerical simulation and analysis of the influence of electrode shrinkage cavity on electroslag remelting (ESR) process of IN718 alloy ingot with a diameter of 430 mm were carried out using the self-developed ESR process model. Electromagnetic fields of ESR system were simulated by a specially designed shrinkage cavity with different shapes and sizes in the electrode. The results show that the contacting area changes between the electrode and the slag owing to the cavity, which plays a predominant role in the distribution of the Joule heat and electromagnetic force in the slag, while the effect of axial dimension change of the shrinkage cavity is negligible. Constant melt rate ESR processes were simulated for different radius cavity situations. It is shown that, at a constant melt rate, the shrinkage cavity has no effect on the ESR process as its radius is less than 0.025 m, and only a small influence on the slag flow when the radius reaches 0.05 m. As the radius increases over 0.05 m, an increasingly evident influence on the slag zone appears via the weakened center downward flow and the increased temperature. Nevertheless, the cavity has no obvious influence on the ingot including the melt pool and mush zone. There is a nonlinear relation between the shrinkage cavity radius and the ESR melting parameters such as current and power, and the critical value of the radius is approximately 0.05 m. Below the critical value, faint or even no change in the parameters appears, while, above the value, the parameters of power and current increase rapidly in an approximately linear manner. From the standpoint of process control stability, the shrinkage cavity radius should be controlled below 0.05 m.

采用自行开发的电渣重熔模型,对直径为430 mm的IN718合金铸锭电渣重熔过程中电极缩孔的影响进行了数值模拟分析。通过在电极上设计不同形状和大小的缩孔,模拟了电磁力共振系统的电磁场。结果表明:由于缩孔的存在,电极与炉渣的接触面积发生了变化,对炉渣焦耳热和电磁力的分布起主导作用,而缩孔轴向尺寸变化的影响可以忽略不计;模拟了不同半径空腔条件下的等熔化速率ESR过程。结果表明,在一定熔融速率下,缩孔半径小于0.025 m时,缩孔对渣渣重熔过程没有影响;当缩孔半径达到0.05 m时,缩孔对渣流的影响较小。当半径大于0.05 m时,中心向下流动减弱,温度升高,对渣区影响越来越明显。然而,空腔对铸锭的影响不明显,包括熔池和泥区。缩孔半径与电流、功率等ESR熔化参数呈非线性关系,其临界值约为0.05 m。在临界值以下,参数变化微弱甚至没有变化,而在临界值以上,功率和电流参数以近似线性的方式迅速增加。从工艺控制稳定性的角度考虑,缩孔半径应控制在0.05 m以下。
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引用次数: 1
Oxygenated Treatment on Saturated Vapour Oxidation Behaviors of GH2984 Alloys for 700 °C Ultra-supercritical Boilers 700℃超超临界锅炉GH2984合金饱和蒸汽氧化行为的氧合处理
IF 0.7 4区 材料科学 Q3 Materials Science Pub Date : 2018-12-01 DOI: 10.1016/S1875-5372(19)30016-5
Wang Yu , Liu Jiangnan , Wang Zhengpin , Yao Yuhong , Yu Zaisong , Lu Jintao

The saturated vapor oxidation behavior of GH2984 alloys at 750 °C were investigated by oxidation weight increasing method, X-ray diffraction and scanning electronic microscopy in different dissolved oxygen concentrations. The results show that the oxide film of GH2984 alloys in different dissolved oxygen concentrations is of a single layer consisting of continuous Cr2O3. The oxidation mass gain of GH2984 alloys slightly increases with the increase of the dissolved oxygen concentrations in water vapor. Oxygenated treatment could accelerate the internal oxidation phenomenon, enhance the oxidation film thickness and make the scattered nodular bulges of Fe2O3 disappear and more Cr-rich nodular bulges form. Moreover, high dissolved oxygen concentrations do not affect the stabilization of Cr2O3 but contribute to the formation of a little Al2O3 and TiO2 which are oxidized internally.

采用氧化增重法、x射线衍射和扫描电镜研究了不同溶解氧浓度下GH2984合金在750℃下的饱和蒸汽氧化行为。结果表明:不同溶解氧浓度下GH2984合金的氧化膜均为连续的Cr2O3组成的单层氧化膜;随着水蒸气中溶解氧浓度的增加,GH2984合金的氧化质量增益略有增加。氧化处理加速了内部氧化现象,增加了氧化膜厚度,使Fe2O3分散的结节状凸起消失,形成更多富cr的结节状凸起。此外,高溶解氧浓度不影响Cr2O3的稳定,但有助于少量Al2O3和TiO2的形成,并被内部氧化。
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引用次数: 1
Review on Joining Process of Carbon Fiber-Reinforced Polymer and Metal: Methods and Joining Process 碳纤维增强聚合物与金属连接工艺研究进展:方法及连接工艺
IF 0.7 4区 材料科学 Q3 Materials Science Pub Date : 2018-12-01 DOI: 10.1016/S1875-5372(19)30018-9
Zhang Dawei , Zhang Qi , Fan Xiaoguang , Zhao Shengdun

The use of carbon fiber-reinforced polymer (CFRP) in aviation, automobile, marine and offshore, etc. increases sharply. The metals such as aluminum alloy are still widely used in these industries. Then, the joining technology of CFRP-metal is one of the key problems urgently to be solved and developed in these industries, especially in aviation industries. Thus, this paper gives a review on the joining processes of carbon fiber-reinforced polymer and metal. The implementation processes and joining material types of adhesive bonding, bolt connection, riveting, welding, “z-pin” (pin inserts), and joining (such as self-pierce riveting, hot riveting, mechanical clinching, friction welding) by plastic deformation, were summarized.

碳纤维增强聚合物(CFRP)在航空、汽车、船舶、海洋等领域的应用急剧增加。铝合金等金属仍广泛应用于这些工业。因此,cfrp -金属的连接技术是这些行业,特别是航空行业急需解决和发展的关键问题之一。因此,本文对碳纤维增强聚合物与金属的连接工艺进行了综述。总结了胶粘接、螺栓连接、铆接、焊接、“z销”(插销)和塑性变形连接(如自孔铆接、热铆接、机械铆接、摩擦焊接)的实现工艺和连接材料类型。
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引用次数: 40
期刊
稀有金属材料与工程
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