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The Influence of Liquid Bridges on Body Contact with a Hydrophobic Periodically Textured Rigid Base 液桥对人体与疏水性周期纹理刚性底座接触的影响
IF 0.9 4区 材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-06-15 DOI: 10.1007/s11003-024-00816-4
O. Kozachok
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引用次数: 0
Preparation of Electrochemical Ni–Mo Coatings from Self-Regulating Electrolytes 利用自调节电解质制备电化学镍钼涂层
IF 0.9 4区 材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-06-15 DOI: 10.1007/s11003-024-00812-8
S. Halaichak, V. A. Vynar, B. Datsko, M. V. Danylchuk
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引用次数: 0
Induction Zone Sintering of WC–8Co Hard Alloy 感应区烧结 WC-8Co 硬质合金
IF 0.9 4区 材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2024-06-15 DOI: 10.1007/s11003-024-00821-7
S. Teslia, O. S. Kucher, I. I. Bogomol, P. I. Loboda, I. V. Solodkyi
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引用次数: 0
Effect of Co-addition of Sn, Traces of RE and Ca on the Mechanical and Micro Structural Properties of As-cast AZ80 Alloy 锡、微量 RE 和 Ca 的共同添加对砷铸造 AZ80 合金的机械和微观结构特性的影响
IF 0.9 4区 材料科学 Q3 Engineering Pub Date : 2024-06-05 DOI: 10.5755/j02.ms.35474
Madhusudhanprasad Manchala, Ramachandra Raju Vegesna
In this study, the effect of co-addition of tin (0, 6 and 9 wt.%), cerium (0, 0.3 and 0.6 wt.%), gadolinium (0, 0.6 and 0.9 wt.%) and calcium (0, 0.6 and 0.9 wt.%) on the mechanical and microstructural properties of AZ80 magnesium alloy is investigated. The results indicate that the mechanical properties are improved for all the as-cast alloys when compared to base alloy except for one alloy which is due to the presence of Mg-Sn-Ca phase in high volume fraction. Also, it is found that the existence of Al2Ca, Mg2Ca, Al2RE, MgSnRE and Mg2Sn phases have a significant impact on the mechanical and microstructural characteristics of the as-cast AZ80 alloys. It is observed that without the addition of Sn content, the best room temperature tensile properties are obtained for the alloy containing 1.5 wt.% of RE and 0.9 wt.% of Ca. With the addition of Sn, it is found that the best room temperature tensile properties are obtained for the alloy containing 6 wt.% of Sn, 0.9 wt.% of RE and 0.5 wt.% of Ca.
本研究调查了锡(0、6 和 9 wt.%)、铈(0、0.3 和 0.6 wt.%)、钆(0、0.6 和 0.9 wt.%)和钙(0、0.6 和 0.9 wt.%)的共同添加对 AZ80 镁合金机械和微观结构特性的影响。结果表明,与基合金相比,所有铸造合金的机械性能都有所改善,只有一种合金除外,这是由于高体积分数的 Mg-Sn-Ca 相的存在。此外,还发现 Al2Ca、Mg2Ca、Al2RE、MgSnRE 和 Mg2Sn 相的存在对铸造 AZ80 合金的机械和微观结构特征有显著影响。据观察,在不添加锡的情况下,含有 1.5 重量%的 RE 和 0.9 重量%的 Ca 的合金可获得最佳的室温拉伸性能。在添加锡的情况下,发现含 6 重量%的锡、0.9 重量%的 RE 和 0.5 重量%的钙的合金室温拉伸性能最佳。
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引用次数: 0
Preparation and Performance Study of Fe2O3/Geopolymer Porous Ceramics Fe2O3/Geopolymer 多孔陶瓷的制备与性能研究
IF 0.9 4区 材料科学 Q3 Engineering Pub Date : 2024-05-22 DOI: 10.5755/j02.ms.35956
Zhenfan Chen, Shaofeng Zhu, Qingqing Wang
In this paper, a kind of geopolymer porous ceramic was prepared using the physical foaming method combined with the gel casting process. The effect of sintering temperature on phase composition and physical properties of samples was studied. Fe2O3/geopolymer porous ceramic samples were prepared by Fe2O3 loaded on the surface of geopolymer porous ceramic samples through the impregnation-calcination method. The Fe2O3-loaded geopolymer porous ceramic samples were characterized by SEM-EDS, FTIR, and XPS. The adsorption experiments were employed to investigate the effect of testing conditions on the adsorption of Pb(Ⅱ) from the Pb(NO3)2 solution. The results show that the porosity of geopolymer porous ceramic samples decreased while the compressive strength increased, and the proportion of pores with a pore size range of < 0.1 mm and 0.1 mm – 0.2 mm increased. The adsorption capacity and removal rate of Pb(II) first increased and then decreased with the increase of Fe(NO3)3 solution concentration, calcination temperature, and holding time. The adsorption capacity and removal rate of Pb(Ⅱ) increased with the increase of the pH value and the initial Pb(II) concentration of the solution.
本文采用物理发泡法结合凝胶铸造工艺制备了一种土工聚合物多孔陶瓷。研究了烧结温度对样品相组成和物理性能的影响。通过浸渍-煅烧法在土工聚合物多孔陶瓷样品表面负载 Fe2O3,制备了 Fe2O3/土工聚合物多孔陶瓷样品。利用 SEM-EDS、傅立叶变换红外光谱和 XPS 对负载了 Fe2O3 的土工聚合物多孔陶瓷样品进行了表征。采用吸附实验研究了试验条件对 Pb(NO3)2 溶液中 Pb(Ⅱ)吸附的影响。结果表明,土工聚合物多孔陶瓷样品的孔隙率降低,而抗压强度增加,孔径范围小于 0.1 mm 和 0.1 mm - 0.2 mm 的孔隙比例增加。随着 Fe(NO3)3 溶液浓度、煅烧温度和保温时间的增加,Pb(II)的吸附容量和去除率先增大后减小。Pb(Ⅱ)的吸附容量和去除率随溶液 pH 值和初始 Pb(Ⅱ)浓度的增加而增加。
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引用次数: 0
Yield Stress and Elongation Prediction and Process Parameter Optimization of Two C-Mn Steel Based on XGBoost and Non-dominated Sorting Genetic Algorithm-IIization of C-Mn steel based on XGBoost algorithm 基于 XGBoost 和非优势排序遗传算法的两种 C-Mn 钢的屈服应力和伸长率预测及工艺参数优化--基于 XGBoost 算法的 C-Mn 钢二级化
IF 0.9 4区 材料科学 Q3 Engineering Pub Date : 2024-05-14 DOI: 10.5755/j02.ms.36556
Xu QIN, Xinqian Zhao, Zhaoyang Jin, Qinghang Wang
Mechanical properties are the key guidance for controlling the product quality of steel and optimizing its process. In this work, four machine learning (ML) algorithms (XGBoost, SVR, BP, and RBF) are used to establish a correlation model between chemical composition, process parameters, and mechanical properties for performance optimization. The ML model showing high prediction accuracy is selected to analyze the importance of the model parameters. The XGBoost model has the highest prediction accuracy, with both yield strength (YS) and elongation-to-failure (EL) achieving a prediction accuracy of over 0.9 on the test set. Subsequently, the (YS) and (EL) of typical steel grades SPHC and Q235B are optimized by combining the high-precision XGBoost model and NSGA-II multi-objective optimization strategy. A comprehensive mechanical performance evaluation index (CP and EV) was proposed to screen the optimal Pareto frontiers, and two types of steel with excellent performance were successfully selected.
机械性能是控制钢铁产品质量和优化钢铁工艺的重要指导。本研究采用四种机器学习(ML)算法(XGBoost、SVR、BP 和 RBF)建立化学成分、工艺参数和机械性能之间的相关模型,以实现性能优化。选择预测准确率较高的 ML 模型来分析模型参数的重要性。XGBoost 模型的预测精度最高,在测试集中,屈服强度(YS)和断裂伸长率(EL)的预测精度都超过了 0.9。随后,结合高精度 XGBoost 模型和 NSGA-II 多目标优化策略,对典型钢种 SPHC 和 Q235B 的(YS)和(EL)进行了优化。提出了综合力学性能评价指标(CP 和 EV)来筛选最优帕累托前沿,并成功选出了两种性能优异的钢材。
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引用次数: 0
The Nucleated Poly(L-lactic acid): The Role of a Phenylacetic Hydrazide Derivative 有核聚乳酸:苯乙肼衍生物的作用
IF 0.9 4区 材料科学 Q3 Engineering Pub Date : 2024-05-08 DOI: 10.5755/j02.ms.36050
Ninghui Tan, Yang Lv, Hao Huang, Lisha Zhao, Yanhua Cai
The melt-crystallization, cold-crystallization, melting behaviors, thermal stability, and optical properties of poly(L-lactic acid) (PLLA) nucleated by a phenylacetic hydrazide derivative (DAPH) were investigated. The melt-crystallization confirmed DAPH’s heterogeneous nucleation role in improving PLLA’s poor crystallization capability, concurrently DAPH loading, cooling rate and final melting temperature were three key factors affecting PLLA’s melt-crystallization behaviors. The results from cold-crystallization indicated that the addition of DAPH could accelerate PLLA’s cold-crystallization via cold-crystallization peak’s shift toward the lower temperature side as DAPH loading increased. Through analysis of PLLA/DAPH’s multiple melting behaviors after melt-crystallization, it was found that DAPH loading, the previous melt-crystallization and heating rate determined PLLA/DAPH’s melting processes after melt-crystallization; and PLLA/DAPH’s melting processes after isothermal crystallization depended on the previous crystallization temperature. A drop in thermal decomposition temperature for 5 wt.% mass loss suggested that pure PLLA has better thermal stability compared with PLLA/DAPH. Additionally, the introduction of DAPH could not improve PLLA’s transparency, in contrast, the haze of PLLA was increased greatly owing to the existence of DAPH.
研究了苯乙酰肼衍生物(DAPH)成核的聚(L-乳酸)(PLLA)的熔融结晶、冷结晶、熔化行为、热稳定性和光学性能。熔融结晶证实了 DAPH 在改善聚乳酸不良结晶能力方面的异质成核作用,同时 DAPH 负载、冷却速率和最终熔融温度是影响聚乳酸熔融结晶行为的三个关键因素。冷结晶结果表明,随着 DAPH 负载的增加,冷结晶峰向低温侧移动,DAPH 的加入可加速 PLLA 的冷结晶。通过分析 PLLA/DAPH 在熔融结晶后的多种熔化行为,发现 DAPH 加载量、之前的熔融结晶和加热速率决定了 PLLA/DAPH 在熔融结晶后的熔化过程;而 PLLA/DAPH 在等温结晶后的熔化过程取决于之前的结晶温度。质量损失为 5 wt.% 时的热分解温度下降表明,与 PLLA/DAPH 相比,纯 PLLA 具有更好的热稳定性。此外,DAPH 的引入并不能提高聚乳酸的透明度,相反,由于 DAPH 的存在,聚乳酸的雾度大大增加。
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引用次数: 0
Near Dry Powder Mixed Electric Discharge Machining of AA7050 Hybrid Composites Utilizing Composite Tool Materials 利用复合工具材料对 AA7050 混合复合材料进行近干粉混合放电加工
IF 0.9 4区 材料科学 Q3 Engineering Pub Date : 2024-05-07 DOI: 10.5755/j02.ms.34795
Poniface JOSE ALOYSIUS, J. J. JEBEEN MOSES, Varghese Thaya Vijumon, Muthu Nadar FELEX XAVIER MUTHU
Electric Discharge Machining (EDM) is a prominent technique for producing components with complex geometry and intricate shapes. However, productivity depends on the selection of optimal input variables. This research investigates EDM and Near-Dry EDM (NDEDM) on AA7050 hybrid composites, exploring the impact of tool materials, Al2O3 powder concentration, and dielectric fluids on Material Removal Rate (MRR) and Surface Roughness (Ra). NDEDM offers a higher MRR due to localized heating and energy concentration, while hydrocarbon oil EDM provides lower Ra due to cooling and lubrication. Tool material properties, thermal conductivity and bonding strength, affect MRR and TWR. Aluminum composite tools via stir casting display a strong bonding interface, leading to efficient energy transfer and higher MRR, while copper composite tools via friction stir processing exhibit weaker bonding, potentially reducing MRR. Hydrocarbon oil significantly lowers TWR due to effective lubrication and cooling, while near dry EDM results in slightly higher TWR. Al2O3 powder enhances MRR, with an optimal concentration of 1 g/l, while higher concentrations hinder MRR. The presence of Al2O3 powder enhanced the surface quality by reducing the size of the recast layers and producing a smoother surface. Globules, craters, microcracks, pock marks and re-casted layers are the noticeable features spotted on the surface. The results were optimized using the TOPSIS optimization technique and process parameters 32 A current, 30 µs Ton, 3 mm gap distance machined under 3 g/l Al2O3 incorporated hydrocarbon oil dielectric medium using copper composites tool proffers optimal machining performance.
放电加工(EDM)是生产具有复杂几何形状和错综复杂形状的部件的一项重要技术。然而,生产率取决于最佳输入变量的选择。本研究调查了 AA7050 混合复合材料上的电火花加工和近干式电火花加工 (NDEDM),探讨了工具材料、Al2O3 粉末浓度和介电流体对材料去除率 (MRR) 和表面粗糙度 (Ra) 的影响。NDEDM 因局部加热和能量集中而具有更高的 MRR,而碳氢油 EDM 则因冷却和润滑而具有更低的 Ra。工具材料特性、导热性和结合强度会影响 MRR 和 TWR。通过搅拌铸造的铝复合材料工具显示出较强的结合界面,从而实现了高效的能量传递和较高的 MRR,而通过搅拌摩擦加工的铜复合材料工具则显示出较弱的结合强度,可能会降低 MRR。由于有效的润滑和冷却,碳氢化合物油明显降低了总功率因数,而近乎干式的电火花加工则略微提高了总功率因数。Al2O3 粉末可提高 MRR,最佳浓度为 1 克/升,而更高的浓度则会阻碍 MRR。Al2O3 粉末的存在可减少再铸层的尺寸,使表面更光滑,从而提高表面质量。表面出现的明显特征是球状、凹坑、微裂纹、麻点和重铸层。使用 TOPSIS 优化技术对结果进行了优化,工艺参数为 32 A 电流、30 µs Ton、3 mm 间距,在 3 g/l Al2O3 掺杂碳氢化合物油介质条件下使用铜复合材料工具进行加工,可获得最佳加工性能。
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引用次数: 0
Mechanical Behavior and Durability of Perlite Based Mortar Exposed to Sodium Sulfate Attack 受到硫酸钠侵蚀的珍珠岩砂浆的力学行为和耐久性
IF 0.9 4区 材料科学 Q3 Engineering Pub Date : 2024-05-07 DOI: 10.5755/j02.ms.34760
Chaib Ouaddah, Omar Safer, Fodil Dif
The objective of this study is to gather additional  on the impact of perlite on both the mechanical properties and resistance to chemical attacks of materials. Various combinations ,incorporating perlite in the form of cement additions, were examined. Five different substitution rates of 10 %, 15 %, 20 %, 25 %,and 30 % of cement with powder perlite were utilized for comparison with plain cement. The findings indicate that the interaction between lime,silica,and alumina in powder perlite results in the formation of several hydrates, such as calcium silicate hydrate, hydrated calcium aluminates,and hydrated gelhenite.Our research focuses on the development of natural perlite from maghnia as a potentially pozzolanic supplementary cementing material. In evaluating the pozzolanicity of this material, it was observed that external aggressions, such as chlorides, CO2, and chemical attacks, can compromise the physical and mechanical properties of concrete,affecting its long-term durability. However,natural pozzolans like pelite exhibit a positive influence on the durability of mortars against sulphate attacks. Test results revealed specimens with no apparent degradation, indicating that sulphate ions in the solution did not adversely affect perlite-based mortars. There is a growing preference for mineral additives with lower production costs than cement. Consequently, the optimal mixture was determined to be one containing 25 % perlite. However, cement pastes and mortars incorporating up to 20 % perlite demonstrated satisfactory physical and mechanical properties, comparable to materials without perlite. The investigation into the perlite materials used in conjunction with cement suggests the potential for sustainable concrete. Experimental results indicate that natural perlite powder from Maghnia can be considered a good pozzolanic material, suitable as a mineral admixture in cement production. 
这项研究的目的是收集更多有关珍珠岩对材料的机械性能和抗化学侵蚀能力的影响的信息。研究考察了以水泥添加物形式加入珍珠岩的各种组合。为了与普通水泥进行比较,使用了 10%、15%、20%、25% 和 30% 五种不同的水泥珍珠岩粉替代率。研究结果表明,粉末珍珠岩中的石灰、二氧化硅和氧化铝之间的相互作用会形成多种水合物,如水合硅酸钙、水合铝酸钙和水合明胶石。在评估这种材料的水胶凝性时,我们发现氯化物、二氧化碳和化学侵蚀等外部侵蚀会损害混凝土的物理和机械性能,影响其长期耐久性。不过,像 pelite 这样的天然胶凝剂对灰泥的耐久性有积极的影响,可以抵御硫酸盐的侵蚀。测试结果表明,试样没有出现明显的降解现象,这表明溶液中的硫酸根离子不会对基于珍珠岩的砂浆产生不利影响。人们越来越倾向于使用生产成本低于水泥的矿物添加剂。因此,最佳混合物被确定为含 25% 珍珠岩的混合物。不过,珍珠岩含量高达 20% 的水泥浆和灰泥也表现出令人满意的物理和机械性能,可与不含珍珠岩的材料相媲美。对与水泥一起使用的珍珠岩材料的调查表明,可持续混凝土具有潜力。实验结果表明,来自马格尼亚的天然珍珠岩粉末可被视为一种良好的胶凝材料,适合作为水泥生产中的矿物掺合料。
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引用次数: 0
Morphology and Porosity of the Surface of Titanium Alloys After Plasma-Electrolytic Oxidation in An Alkaline Environment with Diatomite 硅藻土在碱性环境中进行等离子电解氧化后钛合金表面的形态和孔隙率
IF 0.9 4区 材料科学 Q3 Engineering Pub Date : 2024-04-24 DOI: 10.1007/s11003-024-00797-4
N. Imbirovych, O. I. Zvirko, K. Kurzydłowski
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引用次数: 0
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