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Damage characteristics of Cu−Cr−Zr alloy rail of electromagnetic railgun after simulated launch 电磁轨道炮 Cu-Cr-Zr 合金轨道模拟发射后的损伤特征
IF 4.7 1区 材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING Pub Date : 2024-08-01 DOI: 10.1016/S1003-6326(24)66562-3
Ke-chang SHEN , Qing-tao GONG , Zhong-yu SUN , Hong-tu SUN , Bin-jie MA , Wei-min WANG

The damage characteristics of different speed sections of Cu−Cr−Zr alloy rail after simulated launch were studied. The microstructure, morphologies and properties of samples were investigated by using XRD, XPS, EBSD, SEM, hardness test, electrochemical test and DSC techniques. It was found that deposition layers were formed on the surfaces of the simulated launch samples. The thickness and surface roughness of these deposition layers increased with increasing the heat effect, suggesting a launch speed dependent damage degree of the arc ablation. The hardness variation of samples is attributed to the effects of the deposition layer and deformation hardening. The surface deposition layer affects corrosion resistance and crystalline characteristics, leading to changes in subsequent service performances. Additionally, the surface texture and plastic deformation ability of the samples are related to the recrystallization degree and deformation grain amount.

研究了模拟发射后 Cu-Cr-Zr 合金轨道不同速度截面的损伤特征。采用 XRD、XPS、EBSD、SEM、硬度测试、电化学测试和 DSC 技术研究了样品的微观结构、形态和性能。研究发现,在模拟发射样品的表面形成了沉积层。这些沉积层的厚度和表面粗糙度随着热效应的增加而增加,表明电弧烧蚀的损坏程度与发射速度有关。样品硬度的变化归因于沉积层和变形硬化的影响。表面沉积层会影响耐腐蚀性和结晶特性,从而导致后续使用性能的变化。此外,样品的表面纹理和塑性变形能力与再结晶程度和变形晶粒数量有关。
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引用次数: 0
Separation of halogens and recovery of heavy metals from secondary copper smelting dust 从二次铜冶炼粉尘中分离卤素和回收重金属
IF 4.7 1区 材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING Pub Date : 2024-08-01 DOI: 10.1016/S1003-6326(24)66569-6
Zhi-lou LIU , Zhi-kang CHEN , Fu-ze SUN , Zhi-heng ZHANG , Kang YAN , Shui-ping ZHONG , Hui LIU , Rui-xiang WANG , Jia-yuan LI , Zhi-feng XU

The separation of halogens and recovery of heavy metals from secondary copper smelting (SCS) dust using a sulfating roasting−water leaching process were investigated. The thermodynamic analysis results confirm the feasibility of the phase transformation to metal sulfates and to gaseous HF and HCl. Under the sulfating roasting conditions of the roasting temperature of 250 °C and the sulfuric acid excess coefficient of 1.8, over 74 wt.% of F and 98 wt.% of Cl were volatilized into flue gas. Approximately 98.6 wt.% of Zn and 96.5 wt.% of Cu in the roasting product were dissolved into the leaching solution after the water leaching process, while the leaching efficiencies of Pb and Sn were only 0.12% and 0.22%, respectively. The mechanism studies indicate the pivotal effect of roasting temperature on the sulphation reactions from various metal species to metal sulfates and the salting out reactions from various metal halides to gaseous hydrogen halides.

研究了利用硫化焙烧-水浸出工艺从二次铜冶炼(SCS)粉尘中分离卤素和回收重金属的问题。热力学分析结果证实了相变为金属硫酸盐以及气态 HF 和 HCl 的可行性。在焙烧温度为 250 ℃、硫酸过剩系数为 1.8 的硫化焙烧条件下,超过 74 重量%的 F 和 98 重量%的 Cl 被挥发到烟气中。焙烧产物中约 98.6% 的 Zn 和 96.5% 的 Cu 在水浸过程后溶解到浸出液中,而 Pb 和 Sn 的浸出效率分别只有 0.12% 和 0.22%。机理研究表明,焙烧温度对各种金属转化为金属硫酸盐的硫化反应和各种金属卤化物转化为气态卤化氢的盐析反应有关键影响。
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引用次数: 0
Flotation separation of brucite and calcite in dodecylamine system enhanced by regulator potassium dihydrogen phosphate 调节剂磷酸二氢钾促进十二胺体系中青金石和方解石的浮选分离
IF 4.7 1区 材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING Pub Date : 2024-08-01 DOI: 10.1016/S1003-6326(24)66567-2
Xiu-feng GONG , Jin YAO , Bin YANG , Wan-zhong YIN , Yu-lian WANG , Ya-feng FU

To achieve efficient flotation separation of brucite and calcite, flotation separation experiments were conducted on two minerals using dodecylamine (DDA) as the collector and potassium dihydrogen phosphate (PDP) as the regulator. The action mechanism of DDA and PDP was explored through contact angle measurement, zeta potential detection, solution chemistry calculation, FTIR analysis, and XPS detection. The flotation results showed that when DDA dosage was 35 mg/L and PDP dosage was 40 mg/L, the maximum floating difference between brucite and calcite was 79.81%, and the selectivity separation index was 6.46. The detection analysis showed that the main dissolved component HPO42− of PDP is selectively strongly adsorbed on the Ca site on the surface of calcite, promoting the adsorption of the main dissolved component RNH+ 3 of DDA on calcite surface, while brucite is basically not affected by PDP. Therefore, PDP is an effective regulator for the reverse flotation separation of brucite and calcite in DDA system.

为实现青金石和方解石的高效浮选分离,以十二胺(DDA)为捕收剂,磷酸二氢钾(PDP)为调节剂,对两种矿物进行了浮选分离实验。通过接触角测量、zeta 电位检测、溶液化学计算、傅立叶变换红外光谱分析和 XPS 检测,探索了 DDA 和 PDP 的作用机理。浮选结果表明,当DDA用量为35 mg/L,PDP用量为40 mg/L时,青金石与方解石的最大浮游差为79.81%,选择性分离指数为6.46。检测分析表明,PDP 的主要溶解成分 HPO42- 选择性地强烈吸附在方解石表面的 Ca 位点上,促进了 DDA 的主要溶解成分 RNH+ 3 在方解石表面的吸附,而青金石基本不受 PDP 的影响。因此,PDP 是 DDA 体系中青金石和方解石反浮选分离的有效调节剂。
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引用次数: 0
Effect of wire diameter compression ratio on drawing deformation of micro copper wire 线径压缩比对微型铜线拉伸变形的影响
IF 4.7 1区 材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING Pub Date : 2024-08-01 DOI: 10.1016/S1003-6326(24)66563-5
Tao HUANG , Han-jiang WU , Ke-xing SONG , Yan-min ZHANG , Yan-jun ZHOU , Shao-lin LI

A crystal plasticity finite element model was developed for the drawing deformation of pure copper micro wire, based on rate-dependent crystal plasticity theory. The impact of wire diameter compression ratio on the micro-mechanical deformation behavior during the wire drawing process was investigated. Results indicate that the internal deformation and slip of the drawn wire are unevenly distributed, forming distinct slip and non-slip zones. Additionally, horizontal strain concentration bands develop within the drawn wire. As the wire diameter compression ratio increases, the strength of the slip systems and the extent of slip zones inside the deformation zone also increase. However, the fluctuating stress state, induced by contact pressure and frictional stress, results in a rough and uneven wire surface and diminishes the stability of the drawing process.

基于速率相关晶体塑性理论,建立了纯铜微线拉伸变形的晶体塑性有限元模型。研究了线径压缩比对拉丝过程中微观机械变形行为的影响。结果表明,拉制线材的内部变形和滑移分布不均,形成了明显的滑移区和非滑移区。此外,拉丝内部还出现了水平应变集中带。随着线径压缩比的增大,滑移系统的强度和变形区内部滑移带的范围也随之增大。然而,由接触压力和摩擦应力引起的波动应力状态会导致线材表面粗糙不平,降低拉拔过程的稳定性。
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引用次数: 0
Effect of cold rolling deformation on microstructure evolution and mechanical properties of spray formed Al−Zn−Mg−Cu−Cr alloys 冷轧变形对喷射成形 Al-Zn-Mg-Cu-Cr 合金微观结构演变和力学性能的影响
IF 4.7 1区 材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING Pub Date : 2024-08-01 DOI: 10.1016/S1003-6326(24)66552-0
Cai-he FAN, Yi-hui LI, Qin WU, Ling OU, Ze-yi HU, Yu-meng NI, Jian-jun YANG

The impact of cold rolling deformation, which was introduced after solid solution and before aging treatment, on microstructure evolution and mechanical properties of the as-extruded spray formed Al−9.8Zn−2.3Mg−1.73Cu− 0.13Cr (wt.%) alloy, was investigated. SEM, TEM, and EBSD were used to analyze the microstructures, and tensile tests were conducted to assess mechanical properties. The results indicate that the D1-T6 sample, subjected to 25% cold rolling deformation, exhibits finer grains (3.35 μm) compared to the D0-T6 sample (grain size of 4.23 μm) without cold rolling. Cold rolling refines the grains that grow in solution treatment. Due to the combined effects of finer and more dispersed precipitates, higher dislocation density and smaller grains, the yield strength and ultimate tensile strength of the D1-T6 sample can reach 663 and 737 MPa, respectively. In comparison to the as-extruded and D0-T6 samples, the yield strength of the D1-T6 sample increases by 415 and 92 MPa, respectively.

研究了在固溶后和时效处理前引入的冷轧变形对喷射挤压成型的 Al-9.8Zn-2.3Mg-1.73Cu- 0.13Cr (wt.%) 合金的微观结构演变和机械性能的影响。使用 SEM、TEM 和 EBSD 分析了微观结构,并进行了拉伸试验以评估机械性能。结果表明,与未经过冷轧的 D0-T6 样品(晶粒大小为 4.23 μm)相比,经过 25% 冷轧变形的 D1-T6 样品的晶粒更细(3.35 μm)。冷轧细化了在固溶处理过程中生长的晶粒。由于更细、更分散的析出物、更高的位错密度和更小的晶粒的共同作用,D1-T6 样品的屈服强度和极限抗拉强度可分别达到 663 和 737 兆帕。与挤压成型和 D0-T6 样品相比,D1-T6 样品的屈服强度分别提高了 415 兆帕和 92 兆帕。
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引用次数: 0
Laser processing effects on Ti−45Nb alloy surface, corrosive and biocompatible properties 激光加工对 Ti-45Nb 合金表面、腐蚀性和生物相容性的影响
IF 4.7 1区 材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING Pub Date : 2024-08-01 DOI: 10.1016/S1003-6326(24)66558-1
I. CVIJOVIĆ-ALAGIĆ , S. LAKETIĆ , M. MOMČILOVIĆ , J. CIGANOVIĆ , Đ. VELJOVIĆ , J. BAJAT , V. KOJIĆ , M. RAKIN

The Ti−45Nb (wt.%) alloy properties were investigated in relation to its potential biomedical use. Laser surface modification was utilized to improve its performance in biological systems. As a result of the laser treatment, (Ti,Nb)O scale was formed and various morphological features appeared on the alloy surface. The electrochemical behavior of Ti−45Nb alloy in simulated body conditions was evaluated and showed that the alloy was highly resistant to corrosion deterioration regardless of additional laser surface modification treatment. Nevertheless, the improved corrosion resistance after laser treatment was evident (the corrosion current density of the alloy before laser irradiation was 2.84×10−8 A/cm2, while that after laser treatment with 5 mJ was 0.65×10−8 A/cm2) and ascribed to the rapid formation of a complex and passivating bi-modal surface oxide layer. Alloy cytotoxicity and effects of the Ti−45Nb alloy laser surface modification on the MRC-5 cell viability, morphology, and proliferation were also investigated. The Ti−45Nb alloy showed no cytotoxic effect. Moreover, cells showed improved viability and adherence to the alloy surface after the laser irradiation treatment. The highest average cell viability of 115.37% was attained for the alloy laser-irradiated with 15 mJ. Results showed that the laser surface modification can be successfully utilized to significantly improve alloy performance in a biological environment.

研究了 Ti-45Nb (wt.%) 合金的特性与其潜在的生物医学用途。利用激光进行表面改性以提高其在生物系统中的性能。激光处理的结果是在合金表面形成了(Ti,Nb)O 鳞片和各种形态特征。对 Ti-45Nb 合金在模拟体内条件下的电化学行为进行了评估,结果表明,无论是否进行了额外的激光表面改性处理,该合金都具有很强的抗腐蚀性能。然而,激光处理后合金的耐腐蚀性明显提高(激光照射前合金的腐蚀电流密度为 2.84×10-8 A/cm2,而 5 mJ 激光处理后的腐蚀电流密度为 0.65×10-8 A/cm2),这归因于快速形成了复杂的钝化双模表面氧化层。此外,还研究了合金的细胞毒性以及 Ti-45Nb 合金激光表面改性对 MRC-5 细胞活力、形态和增殖的影响。结果表明,Ti-45Nb 合金没有细胞毒性。此外,经过激光照射处理后,细胞的存活率和对合金表面的附着力都有所提高。经 15 mJ 激光照射的合金细胞平均存活率最高,达到 115.37%。结果表明,激光表面改性可以成功地改善合金在生物环境中的性能。
{"title":"Laser processing effects on Ti−45Nb alloy surface, corrosive and biocompatible properties","authors":"I. CVIJOVIĆ-ALAGIĆ ,&nbsp;S. LAKETIĆ ,&nbsp;M. MOMČILOVIĆ ,&nbsp;J. CIGANOVIĆ ,&nbsp;Đ. VELJOVIĆ ,&nbsp;J. BAJAT ,&nbsp;V. KOJIĆ ,&nbsp;M. RAKIN","doi":"10.1016/S1003-6326(24)66558-1","DOIUrl":"10.1016/S1003-6326(24)66558-1","url":null,"abstract":"<div><p>The Ti−45Nb (wt.%) alloy properties were investigated in relation to its potential biomedical use. Laser surface modification was utilized to improve its performance in biological systems. As a result of the laser treatment, (Ti,Nb)O scale was formed and various morphological features appeared on the alloy surface. The electrochemical behavior of Ti−45Nb alloy in simulated body conditions was evaluated and showed that the alloy was highly resistant to corrosion deterioration regardless of additional laser surface modification treatment. Nevertheless, the improved corrosion resistance after laser treatment was evident (the corrosion current density of the alloy before laser irradiation was 2.84×10<sup>−8</sup> A/cm<sup>2</sup>, while that after laser treatment with 5 mJ was 0.65×10<sup>−8</sup> A/cm<sup>2</sup>) and ascribed to the rapid formation of a complex and passivating bi-modal surface oxide layer. Alloy cytotoxicity and effects of the Ti−45Nb alloy laser surface modification on the MRC-5 cell viability, morphology, and proliferation were also investigated. The Ti−45Nb alloy showed no cytotoxic effect. Moreover, cells showed improved viability and adherence to the alloy surface after the laser irradiation treatment. The highest average cell viability of 115.37% was attained for the alloy laser-irradiated with 15 mJ. Results showed that the laser surface modification can be successfully utilized to significantly improve alloy performance in a biological environment.</p></div>","PeriodicalId":23191,"journal":{"name":"Transactions of Nonferrous Metals Society of China","volume":"34 8","pages":"Pages 2533-2551"},"PeriodicalIF":4.7,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1003632624665581/pdf?md5=2159b6cf5abaab1dd793253ccfbc258f&pid=1-s2.0-S1003632624665581-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142239437","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Graphene-loaded nickel−vanadium bimetal oxides as hydrogen pumps to boost solid-state hydrogen storage kinetic performance of magnesium hydride 石墨烯负载的镍钒双金属氧化物作为氢泵提升氢化镁的固态储氢动力学性能
IF 4.7 1区 材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING Pub Date : 2024-08-01 DOI: 10.1016/S1003-6326(24)66566-0
Dong-qiang GAO , Fu-ying WU , Zhi ZHANG , Zi-chuan LU , Ren ZHOU , Hu ZHAO , Liu-ting ZHANG

To modify the thermodynamics and kinetic performance of magnesium hydride (MgH2) for solid-state hydrogen storage, Ni3V2O8-rGO (rGO represents reduced graphene oxide) and Ni3V2O8 nanocomposites were prepared by hydrothermal and subsequent heat treatment. The beginning hydrogen desorption temperature of 7 wt.% Ni3V2O8-rGO modified MgH2 was reduced to 208 °C, while the additive-free MgH2 and 7 wt.% Ni3V2O8 doped MgH2 appeared to discharge hydrogen at 340 and 226 °C, respectively. A charging capacity of about 4.7 wt.% H2 for MgH2 + 7 wt.% Ni3V2O8-rGO was achieved at 125 °C in 10 min, while the dehydrogenated MgH2 took 60 min to absorb only 4.6 wt.% H2 at 215 °C. The microstructure analysis confirmed that the in-situ generated Mg2Ni/Mg2NiH4 and metallic V contributed significantly to the enhanced performance of MgH2. In addition, the presence of rGO in the MgH2 + 7 wt.% Ni3V2O8-rGO composite reduced particle aggregation tendency of Mg/MgH2, leading to improving the cyclic stability of MgH2 during 20 cycles.

为了改变氢化镁(MgH2)固态储氢的热力学和动力学性能,通过水热法和后续热处理制备了 Ni3V2O8-rGO(rGO 代表还原氧化石墨烯)和 Ni3V2O8 纳米复合材料。7 wt.% Ni3V2O8-rGO 改性 MgH2 的起始解吸氢温度降低到 208 ℃,而无添加剂的 MgH2 和 7 wt.% 掺杂 Ni3V2O8 的 MgH2 分别在 340 ℃ 和 226 ℃ 下出现放氢。125 ℃时,MgH2 + 7 wt.% Ni3V2O8-rGO 在 10 分钟内就能达到约 4.7 wt.% H2 的充氢能力,而脱氢 MgH2 在 215 ℃时需要 60 分钟才能吸收 4.6 wt.% H2。微观结构分析证实,原位生成的 Mg2Ni/Mg2NiH4 和金属 V 在很大程度上提高了 MgH2 的性能。此外,MgH2 + 7 wt.% Ni3V2O8-rGO 复合材料中 rGO 的存在降低了 Mg/MgH2 的颗粒聚集趋势,从而提高了 MgH2 在 20 个循环期间的循环稳定性。
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引用次数: 0
Effect of Mo and ZrO2 nanoparticles addition on interfacial properties and shear strength of Sn58Bi/Cu solder joint 添加 Mo 和 ZrO2 纳米粒子对 Sn58Bi/Cu 焊点界面性能和剪切强度的影响
IF 4.7 1区 材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING Pub Date : 2024-08-01 DOI: 10.1016/S1003-6326(24)66564-7
Amares SINGH , Hui Leng CHOO , Wei Hong TAN , Rajkumar DURAIRAJ

The influence of Mo and ZrO2 nanoparticles addition on the interfacial properties and shear strength of Sn58Bi solder joint was investigated. The interfacial microstructures of Sn58Bi/Cu, Sn58Bi + Mo/Cu and Sn58Bi + ZrO2/Cu solder joints were analysed using a scanning electron microscope (SEM) coupled with energy dispersive X-ray (EDX) and the X-ray diffraction (XRD). Intermetallic compounds (IMCs) of MoSn2 are detected in the Sn58Bi + Mo/Cu solder joint, while SnZr, Zr5Sn3, ZrCu and ZrSn2 are detected in Sn58Bi + ZrO2/Cu solder joint. IMC layers for both composite solders comprise of Cu6Sn5 and Cu3Sn. The SEM images of these layers were used to measure the IMC layer’s thickness. The average IMC layer’s thickness is 1.4431 µm for Sn58Bi + Mo/Cu and 0.9112 µm for Sn58Bi + ZrO2/Cu solder joints. Shear strength of the solder joints was investigated via the single shear lap test method. The average maximum load and shear stress of the Sn58Bi + Mo/Cu and Sn58Bi + ZrO2/Cu solder joints are increased by 33% and 69%, respectively, as compared to those of the Sn58Bi/Cu solder joint. By comparing both composite solder joints, the latter prevails better as adding smaller sized ZrO2 nanoparticles improves the interfacial properties granting a stronger solder joint.

研究了添加 Mo 和 ZrO2 纳米粒子对 Sn58Bi 焊点的界面性能和剪切强度的影响。使用扫描电子显微镜(SEM)结合能量色散 X 射线(EDX)和 X 射线衍射(XRD)分析了 Sn58Bi/Cu、Sn58Bi + Mo/Cu 和 Sn58Bi + ZrO2/Cu 焊点的界面微结构。在 Sn58Bi + Mo/Cu 焊点中检测到了 MoSn2 金属间化合物(IMC),而在 Sn58Bi + ZrO2/Cu 焊点中检测到了 SnZr、Zr5Sn3、ZrCu 和 ZrSn2 金属间化合物。两种复合焊料的 IMC 层均由 Cu6Sn5 和 Cu3Sn 组成。这些层的 SEM 图像用于测量 IMC 层的厚度。Sn58Bi + Mo/Cu 焊点的平均 IMC 层厚度为 1.4431 µm,Sn58Bi + ZrO2/Cu 焊点的平均 IMC 层厚度为 0.9112 µm。焊点的剪切强度通过单次剪切搭接测试法进行了研究。与 Sn58Bi/Cu 焊点相比,Sn58Bi + Mo/Cu 和 Sn58Bi + ZrO2/Cu 焊点的平均最大载荷和剪切应力分别增加了 33% 和 69%。通过比较这两种复合焊点,后者更胜一筹,因为添加较小尺寸的 ZrO2 纳米粒子可以改善界面性能,从而获得更强的焊点。
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引用次数: 0
Vermiform Ni@CNT derived from one-pot calcination of Ni-MOF precursor for improving hydrogen storage of MgH2 一锅煅烧 Ni-MOF 前驱体生成的 Vermiform Ni@CNT 可改善 MgH2 的储氢性能
IF 4.7 1区 材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING Pub Date : 2024-08-01 DOI: 10.1016/S1003-6326(24)66565-9
Zi-yin DAI , Bing ZHANG , Hideo KIMURA , Li-rong XIAO , Rong-han LIU , Cui NI , Chuan-xin HOU , Xue-qin SUN , Yu-ping ZHANG , Xiao-yang YANG , Rong-hai YU , Wei DU , Xiu-bo XIE

The Ni-coated carbon nanotubes (Ni@CNT) composite was synthesized by the facile “filtration + calcination” of Ni-based metal−organic framework (MOF) precursor and the obtained composite was used as a catalyst for MgH2. MgH2 was mixed evenly with different amounts of Ni@CNT (2.5, 5.0 and 7.5, wt.%) through ball milling. The MgH2−5wt.%Ni@CNT can absorb 5.2 wt.% H2 at 423 K in 200 s and release about 3.75 wt.% H2 at 573 K in 1000 s. And its dehydrogenation and rehydrogenation activation energies are reduced to 87.63 and 45.28 kJ/mol (H2). The in-situ generated Mg2Ni/Mg2NiH4 exhibits a good catalytic effect due to the provided more diffusion channels that can be used as “hydrogen pump”. And the presence of carbon nanotubes improves the properties of MgH2 to some extent.

通过对镍基金属有机框架(MOF)前驱体进行简便的 "过滤+煅烧",合成了镍包覆碳纳米管(Ni@CNT)复合材料,并将得到的复合材料用作 MgH2 的催化剂。通过球磨将 MgH2 与不同重量百分比的 Ni@CNT (2.5、5.0 和 7.5)均匀混合。MgH2-5wt.%Ni@CNT 在 423 K 下可在 200 秒内吸收 5.2 wt.% H2,在 573 K 下可在 1000 秒内释放约 3.75 wt.% H2。原位生成的 Mg2Ni/Mg2NiH4 具有良好的催化效果,因为它提供了更多的扩散通道,可用作 "氢泵"。碳纳米管的存在在一定程度上改善了 MgH2 的性能。
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引用次数: 0
Peridynamic simulation of rock failure with surface flaw under dynamic loading 动态加载下带有表面缺陷的岩石破坏的周动态模拟
IF 4.7 1区 材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING Pub Date : 2024-07-01 DOI: 10.1016/S1003-6326(24)66543-X
Jun ZHANG, Lin-qi HUANG, Zhi-xiang LIU, Xi-bing LI

To investigate the propagation of surface flaws in rocks under dynamic loading, an elastic−plastic ordinary state-based peridynamic model that considers the compressive to tensile strength ratio is used for numerical tests based on the results of previous experiments. The failure process of rocks containing three-dimensional surface flaws at different angles and depths under dynamic loading is simulated. The simulation results show that the peridynamic model used can well simulate the propagation of three-dimensional cracks in rocks and the failure process of specimens. Peridynamic simulations can be used to obtain strength variation regularity which is consistent with the experimental results. The crack generated on the surface of the specimen penetrates to a certain depth inside the specimen, which is related to the depth of the surface flaw. Shell-like cracks generated inside the specimen join with cracks generated on the surface to form complex three-dimensional cracks.

为了研究岩石表面缺陷在动荷载作用下的扩展,在以往实验结果的基础上,采用了考虑抗压强度与抗拉强度比的弹塑性普通状态围岩动力学模型进行数值试验。模拟了含有不同角度和深度的三维表面缺陷的岩石在动荷载作用下的破坏过程。模拟结果表明,所使用的围岩动力学模型能够很好地模拟岩石中三维裂缝的扩展和试样的破坏过程。围动力模拟可以获得强度变化的规律性,这与实验结果是一致的。试样表面产生的裂纹会向试样内部渗透到一定深度,这与表面缺陷的深度有关。试样内部产生的贝壳状裂纹与表面产生的裂纹结合形成复杂的三维裂纹。
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引用次数: 0
期刊
Transactions of Nonferrous Metals Society of China
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