Transactions of Nonferrous Metals Society of China最新文献_第8页

Ultra-high strength Inconel 718 alloy produced by a novel heat treatment 通过新型热处理生产超高强度铬镍铁合金 718

IF 4.7 1区材料科学

Transactions of Nonferrous Metals Society of China Pub Date : 2024-07-01 DOI: 10.1016/S1003-6326(24)66535-0

Rong RAN, Yang WANG, Fu-qiang REN, Yuan-xiang ZHANG, Feng FANG, Wei-na ZHANG, Guo YUAN, Guo-dong WANG

{"title":"Ultra-high strength Inconel 718 alloy produced by a novel heat treatment","authors":"Rong RAN, Yang WANG, Fu-qiang REN, Yuan-xiang ZHANG, Feng FANG, Wei-na ZHANG, Guo YUAN, Guo-dong WANG","doi":"10.1016/S1003-6326(24)66535-0","DOIUrl":"10.1016/S1003-6326(24)66535-0","url":null,"abstract":"<div><p>In order to ameliorate microstructure and optimize properties of Inconel 718 alloy, a novel heat treatment method combining high-temperature ultra-short annealing at 980 °C for 1 min with subsequent double aging was proposed. The results showed that ultra-short annealing generated partially recrystallized microstructure and recrystallized nuclei were formed even in deformed grains, which was confirmed by KAM maps. Therefore, high-temperature ultra-short annealing overcame recrystallization barrier, and the subsequent recrystallization process could be completed during aging treatment with relatively low temperature, resulting in the uniformly refined microstructure (∼3.59 µm). The 980-1min-aged sample exhibited outstanding tensile properties. The room temperature ultimate strength and total elongation were 1600 MPa and 19%, respectively. The corresponding values of high- temperature (650 °C) tensile tests were ∼1350 MPa and ∼26%. Consequently, ultra-short annealing can be a promising route to enhance the properties of Inconel 718 alloy.</p></div>","PeriodicalId":23191,"journal":{"name":"Transactions of Nonferrous Metals Society of China","volume":"34 7","pages":"Pages 2204-2218"},"PeriodicalIF":4.7,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1003632624665350/pdf?md5=5471ae3e98b7affe2b23649feb6d72a1&pid=1-s2.0-S1003632624665350-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141853123","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

Electrochemical behavior of MgCl2 and co-deposition mechanisms of Mg and Sr in SrCl2−KCl−MgCl2 melt 氯化镁的电化学行为以及 SrCl2-KCl-MgCl2 熔体中镁和锶的共沉积机制

IF 4.7 1区材料科学

Transactions of Nonferrous Metals Society of China Pub Date : 2024-07-01 DOI: 10.1016/S1003-6326(24)66548-9

Jia ZHAO , Yi-hang YAN , Hao ZHANG , Hua-yang GAO , Ye ZHANG , Gui-min LU

{"title":"Electrochemical behavior of MgCl2 and co-deposition mechanisms of Mg and Sr in SrCl2−KCl−MgCl2 melt","authors":"Jia ZHAO , Yi-hang YAN , Hao ZHANG , Hua-yang GAO , Ye ZHANG , Gui-min LU","doi":"10.1016/S1003-6326(24)66548-9","DOIUrl":"10.1016/S1003-6326(24)66548-9","url":null,"abstract":"<div><p>The electrochemical behavior of MgCl<sub>2</sub> and the co-deposition mechanisms of Mg and Sr in the SrCl<sub>2</sub>−KCl eutectic system were evaluated using various electrochemical techniques, including cyclic voltammetry (CV), square wave voltammetry (SWV), and open-circuit potential (OCP) analysis. It was observed the Mg(II) reduction on the tungsten electrode in SrCl<sub>2</sub>−KCl melt occurred in a single-step process involving the transfer of two electrons, exhibiting a quasi-reversible mode. The electrochemical co-deposition of Mg and Sr in the SrCl<sub>2</sub>−KCl−MgCl<sub>2</sub> melt involved the formation of two types of Mg−Sr intermetallic compounds. The evolution in the co-deposition mechanism of the nucleation type with changing overpotential was explored through chronoamperometry (CA). It is shown that the nucleation pattern on the electrode surface was depended on the substrate materials and the electrode reaction products. Early-stage nucleation was attributed to Mg(II) reduction under all overpotential conditions. With the co-deposition of Mg and Sr, Mg(II) was reduced to form the Mg nucleus on the electrode surface, followed by underpotential deposition of Sr(II) on the Mg surface accompanied by Mg deposition simultaneously. Additionally, increasing MgCl<sub>2</sub> concentration in the SrCl<sub>2</sub>−KCl melt resulted in a higher current density during the Mg−Sr co-deposition process.</p></div>","PeriodicalId":23191,"journal":{"name":"Transactions of Nonferrous Metals Society of China","volume":"34 7","pages":"Pages 2381-2392"},"PeriodicalIF":4.7,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1003632624665489/pdf?md5=964e91e0b575d2d697a3f6e3042e0e1b&pid=1-s2.0-S1003632624665489-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141853918","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

Bio-dissolution and kinetics of pyrite-bearing waste ores in presence of Acidithiobacillus ferrooxidans 含黄铁矿废矿在酸性硫杆菌铁氧体存在下的生物溶解和动力学研究

IF 4.7 1区材料科学

Transactions of Nonferrous Metals Society of China Pub Date : 2024-07-01 DOI: 10.1016/S1003-6326(24)66545-3

Mao-xin HONG , Jun WANG , Bao-jun YANG , Yang LIU , Rui LIAO , Shi-chao YU , Shi-tong LIU , An-ni TANG , Wei WANG , Guan-zhou QIU

{"title":"Bio-dissolution and kinetics of pyrite-bearing waste ores in presence of Acidithiobacillus ferrooxidans","authors":"Mao-xin HONG , Jun WANG , Bao-jun YANG , Yang LIU , Rui LIAO , Shi-chao YU , Shi-tong LIU , An-ni TANG , Wei WANG , Guan-zhou QIU","doi":"10.1016/S1003-6326(24)66545-3","DOIUrl":"10.1016/S1003-6326(24)66545-3","url":null,"abstract":"<div><p>Bioleaching treatment was used to decontaminate pyrite-bearing waste rocks, mitigating the risk of acid mine drainage (AMD) generation at source. The bioleaching results showed that nearly 82% of Fe and S could be removed from pyrite-bearing waste within 40 d in the presence of <em>Acidithiobacillus ferrooxidans</em> (<em>A. ferrooxidans</em>). Kinetics study showed that the removal of pyrite from waste ore was mainly in the control of the chemical reaction and internal diffusion. The results of X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) indicated that the formed biogenic jarosite could passivate the residual pyrite under the mediation of <em>A. ferrooxidans</em>. Secondary bioleaching experiments on the residual samples revealed no noticeable decrease in solution pH and only 8 and 160 mg/L of iron dissolved from the two residual mine waste samples, respectively, indicating that the acid and iron release capacity of the mine waste samples was weakened.</p></div>","PeriodicalId":23191,"journal":{"name":"Transactions of Nonferrous Metals Society of China","volume":"34 7","pages":"Pages 2342-2353"},"PeriodicalIF":4.7,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1003632624665453/pdf?md5=b6d930852ad8f61aca6b9fa665ef3e68&pid=1-s2.0-S1003632624665453-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141842738","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

Effects of aging on microstructure and wear resistance of laser cladding Mo0.5NbTiVCr0.25 high-entropy alloy coating 时效对激光熔覆 Mo0.5NbTiVCr0.25 高熵合金涂层微观结构和耐磨性的影响

IF 4.7 1区材料科学

Transactions of Nonferrous Metals Society of China Pub Date : 2024-07-01 DOI: 10.1016/S1003-6326(24)66536-2

Ji HE , Hua-meng FU , Cui-rong LIU , Zheng-wang ZHU , Long ZHANG , Zheng-kun LI , Hong LI , Hai-feng ZHANG

{"title":"Effects of aging on microstructure and wear resistance of laser cladding Mo0.5NbTiVCr0.25 high-entropy alloy coating","authors":"Ji HE , Hua-meng FU , Cui-rong LIU , Zheng-wang ZHU , Long ZHANG , Zheng-kun LI , Hong LI , Hai-feng ZHANG","doi":"10.1016/S1003-6326(24)66536-2","DOIUrl":"10.1016/S1003-6326(24)66536-2","url":null,"abstract":"<div><p>Refractory Mo<sub>0.5</sub>NbTiVCr<sub>0.25</sub> high-entropy alloy coatings were fabricated on TC4 substrates using laser cladding technology. The coatings were aged at 600, 800 and 1000 °C for 24 h and then water-cooled. The phase composition, microstructure, and mechanical properties of the high-entropy alloy coatings were investigated using X-ray diffraction (XRD), scanning electron microscopy (SEM), electron backscattered diffraction (EBSD), transmission electron microscopy (TEM), Vickers hardness testing and universal friction wear testing. The results showed that high-entropy alloy coatings retained a body-centered cubic structure after different aging heat treatments. After the aging heat treatment at 800 °C, the coatings exhibited Ti-rich precipitation phases, which were verified as Ti(O,N) face-centered cubic structures by TEM technique. The optimum aging temperature was 600 °C and the hardness of the coating was HV<sub>0.2</sub> 410. The wear mechanisms of the coatings were adhesive and abrasive wear.</p></div>","PeriodicalId":23191,"journal":{"name":"Transactions of Nonferrous Metals Society of China","volume":"34 7","pages":"Pages 2219-2230"},"PeriodicalIF":4.7,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1003632624665362/pdf?md5=b58fb3c652429cecd6ecd194ec85f294&pid=1-s2.0-S1003632624665362-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141843838","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

Electrodeposition of dendrite-free Zn on Au from deep eutectic system based on choline chloride 基于氯化胆碱的深共晶体系在金上电沉积无枝晶的锌

IF 4.7 1区材料科学

Transactions of Nonferrous Metals Society of China Pub Date : 2024-07-01 DOI: 10.1016/S1003-6326(24)66547-7

Vesna S. CVETKOVIĆ , Nebojša D. NIKOLIĆ , Tanja S. BARUDŽIJA , Silvana B. DIMITRIJEVIĆ , Jovan N. JOVIĆEVIĆ

{"title":"Electrodeposition of dendrite-free Zn on Au from deep eutectic system based on choline chloride","authors":"Vesna S. CVETKOVIĆ , Nebojša D. NIKOLIĆ , Tanja S. BARUDŽIJA , Silvana B. DIMITRIJEVIĆ , Jovan N. JOVIĆEVIĆ","doi":"10.1016/S1003-6326(24)66547-7","DOIUrl":"10.1016/S1003-6326(24)66547-7","url":null,"abstract":"<div><p>The electrochemical deposition of zinc/gold dendrite-free alloys was achieved from deep eutectic solvents based on a mixture of choline chloride and ethylene glycol, without using any additives. Potentiostatic electrodeposition was carried out at relatively low Zn electrodeposition overpotential at different Zn(II) concentrations. Insight into the electrochemical mechanism of the Zn electrodeposition was revealed by cyclic voltammetry (CV) and chrono- amperometry (CA). The morphology and structure of the obtained electrodeposits were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD), while the elemental analysis was determined by energy dispersive spectroscopy (EDS) technique. The CV results showed that Zn electrodeposition commences with zinc underpotential deposition (UPD) and proceeds through the zinc overpotential deposition (OPD) region. The deposition potential of the Zn/Zn(II) couple shifts towards more positive value with increased Zn(II) concentration. CA analysis demonstrated that in the zinc OPD region, 3D progressive nucleation starts, followed by 3D growth of depositing zinc. Morphological analysis revealed that electrodeposition commences with the formation of compact Zn islands and proceeds through dendrite-free zinc/gold alloys formed. A formation of several intermetallics, namely cubic AuZn<sub>3</sub> and AuZn along with metallic zinc were identified by XRD analysis.</p></div>","PeriodicalId":23191,"journal":{"name":"Transactions of Nonferrous Metals Society of China","volume":"34 7","pages":"Pages 2367-2380"},"PeriodicalIF":4.7,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1003632624665477/pdf?md5=5f21563591edc640c37b46ab6651710a&pid=1-s2.0-S1003632624665477-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141841996","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

A short process for organics removal from sodium aluminate solution by regulating electrical double layer of tricalcium aluminate hexahydrate 通过调节六水铝酸三钙的电双层从铝酸钠溶液中去除有机物的简易工艺

IF 4.7 1区材料科学

Transactions of Nonferrous Metals Society of China Pub Date : 2024-07-01 DOI: 10.1016/S1003-6326(24)66546-5

Zhen-jiang FU , Gui-hua LIU , Tian-gui QI , Lei-ting SHEN , Zhi-hong PENG , Qiu-sheng ZHOU , Yi-lin WANG , Hui FANG , Yong-lin WANG

{"title":"A short process for organics removal from sodium aluminate solution by regulating electrical double layer of tricalcium aluminate hexahydrate","authors":"Zhen-jiang FU , Gui-hua LIU , Tian-gui QI , Lei-ting SHEN , Zhi-hong PENG , Qiu-sheng ZHOU , Yi-lin WANG , Hui FANG , Yong-lin WANG","doi":"10.1016/S1003-6326(24)66546-5","DOIUrl":"10.1016/S1003-6326(24)66546-5","url":null,"abstract":"<div><p>The economical removal of organics from sodium aluminate solutions has been required for decades. Based on security filtration using tricalcium aluminate hexahydrate (TCA) as a filter aid, a novel short process to eliminate impurity particles and remove organics simultaneously was presented. Ultrafine TCA samples with poor crystallization, high TCA content, high surface free energy, and large lattice distortion were prepared in the concentrated sodium aluminate solution. The zeta potential of the TCA binary mixture in alkaline solutions was linearly depended on the TCA content, suggesting the additivity of the zeta potential in the binary mixture. The variation in the electrical double layer of the TCA binary mixture was demonstrated in the alkaline solution. Furthermore, the ultrafine TCA exhibited a high adsorption capacity for organics with long alkyl chains and high relative-molecular-mass. The adsorption capacity of 69.69 mg/g organic carbon for sodium humate was achieved, whereas the digestion at a high temperature remarkably reduced the adsorption capacity of TCA.</p></div>","PeriodicalId":23191,"journal":{"name":"Transactions of Nonferrous Metals Society of China","volume":"34 7","pages":"Pages 2354-2366"},"PeriodicalIF":4.7,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1003632624665465/pdf?md5=fb48fbe7772bbabb8334a701dfa1bccf&pid=1-s2.0-S1003632624665465-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141853079","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

Tailoring good combinations between strength and ductility in novel Mg−5Sn−2Al−1Zn alloy via different hot extrusion processes 通过不同的热挤压工艺在新型 Mg-5Sn-2Al-1Zn 合金中实现强度和延展性的良好结合

IF 4.7 1区材料科学

Transactions of Nonferrous Metals Society of China Pub Date : 2024-07-01 DOI: 10.1016/S1003-6326(24)66529-5

Feng-jian SHI, Nan-ying PIAO, Ji-heng WANG, Hao-tian TAN, Yu-hang GUO, Fei YANG, Shu-jin CHEN, Sheng LU, Ze-xin WANG

{"title":"Tailoring good combinations between strength and ductility in novel Mg−5Sn−2Al−1Zn alloy via different hot extrusion processes","authors":"Feng-jian SHI, Nan-ying PIAO, Ji-heng WANG, Hao-tian TAN, Yu-hang GUO, Fei YANG, Shu-jin CHEN, Sheng LU, Ze-xin WANG","doi":"10.1016/S1003-6326(24)66529-5","DOIUrl":"10.1016/S1003-6326(24)66529-5","url":null,"abstract":"<div><p>A novel Mg−5Sn−2Al−1Zn (TAZ521) alloy was prepared. Direct extrusion (DE) and extrusion−shearing (ES) processes were performed on the alloy to improve its strength and ductility. The microstructure evolution, texture evolution, and strengthening mechanisms of as-homogenized and as-extruded alloy were investigated by XRD, SEM, TEM, EBSD, and tensile tests. The results showed that the mechanical properties of the DE-processed alloy were improved. However, the alloy exhibited a bimodal microstructure consisting of coarse grains and fine DRXed grains. After the ES process, the microstructure became more uniform and a good combination of strength and ductility was achieved. The TYS, UTS, and EL were 212 MPa, 303 MPa, and 21.7%, respectively. Grain refinement and pinning effect by Mg<sub>2</sub>Sn precipitates play an important role in the enhancement of strength. Additionally, the improvement of ductility is attributed to the weak basal fiber texture and the activation of non-basal slip.</p></div>","PeriodicalId":23191,"journal":{"name":"Transactions of Nonferrous Metals Society of China","volume":"34 7","pages":"Pages 2120-2137"},"PeriodicalIF":4.7,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1003632624665295/pdf?md5=66c410d07cad9d66e30ea44f350e2fb7&pid=1-s2.0-S1003632624665295-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141843896","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

Plasma-sprayed Al-based coating with WC-addition for excellent corrosion resistance and enhanced wear protection of Mg alloys 添加了 WC 的等离子喷涂铝基涂层，可为镁合金提供出色的耐腐蚀性和更强的耐磨保护

IF 4.7 1区材料科学

Transactions of Nonferrous Metals Society of China Pub Date : 2024-07-01 DOI: 10.1016/S1003-6326(24)66540-4

Haroon RASHID, Xiao-tao LUO, Xin-yuan DONG, Li ZHANG, Chang-jiu LI

{"title":"Plasma-sprayed Al-based coating with WC-addition for excellent corrosion resistance and enhanced wear protection of Mg alloys","authors":"Haroon RASHID, Xiao-tao LUO, Xin-yuan DONG, Li ZHANG, Chang-jiu LI","doi":"10.1016/S1003-6326(24)66540-4","DOIUrl":"10.1016/S1003-6326(24)66540-4","url":null,"abstract":"<div><p>Thermal spray processes struggle to create a fully dense coating for corrosion protection in the as-sprayed state due to the poor inter-splat bonding. To tackle this problem, Al−15vol.%WC was utilized as the coating material and applied by atmospheric plasma spraying (APS) to produce a dense coating with self-metallurgical inter-splat bonding. The results show that due to the in-flight particle deoxidizing effect by C element and self-metallurgical bonding of the overheated droplet (>1800 °C), dense coating without oxides inclusions is produced under optimized plasma spraying conditions. The fully dense Al−WC coating exhibits excellent corrosion resistance, with corrosion current density lower by four and two orders than that of Mg alloy substrate and bulk Al, respectively. Due to the inclusion of hard WC particles, the Al−WC coating presents one order improvement in wear resistance compared with the bulk Al.</p></div>","PeriodicalId":23191,"journal":{"name":"Transactions of Nonferrous Metals Society of China","volume":"34 7","pages":"Pages 2275-2288"},"PeriodicalIF":4.7,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1003632624665404/pdf?md5=1802d229aa6e7e7b75b95fce1b89d8d1&pid=1-s2.0-S1003632624665404-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141847095","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

Oxidation behavior of Cu-based brake pad for high-speed train 高速列车铜基刹车片的氧化行为

IF 4.7 1区材料科学

Transactions of Nonferrous Metals Society of China Pub Date : 2024-07-01 DOI: 10.1016/S1003-6326(24)66539-8

Jin-kun XIAO , Tian-tian LI , Ting-feng BAO , Juan CHEN , Chao ZHANG

{"title":"Oxidation behavior of Cu-based brake pad for high-speed train","authors":"Jin-kun XIAO , Tian-tian LI , Ting-feng BAO , Juan CHEN , Chao ZHANG","doi":"10.1016/S1003-6326(24)66539-8","DOIUrl":"10.1016/S1003-6326(24)66539-8","url":null,"abstract":"<div><p>Cu-based brake pad for high-speed train undergoes cyclic oxidation due to the generation and dissipation of friction heat during braking. The oxidation behavior of the Cu-based brake pad was investigated via isothermal oxidation at 300, 400, 500, 600 and 700 °C for up to 50 h. The results show that the oxidation of the Cu-based brake pad presents multiple stages. The combination of the oxidation of Cu and Fe and the oxygen diffusion controls the oxidation process in the earlier stage, while the oxidation of graphite plays a more important role in the later stages above 500 °C. The Cu<sub>2</sub>O nanoclusters are firstly formed by the oxidation of copper, then CuO nanowires, and finally fine and coarse equiaxed grains are generated. The rise in temperature promotes the growth and densification of Fe<sub>2</sub>O<sub>3</sub> nanosheets, which grow on the Fe<sub>3</sub>O<sub>4</sub> layer. However, Fe oxides are gradually covered by Cu oxides because of the larger volume expansion of Cu oxides. The connected pores formed by the graphite burn-off provide oxygen diffusion channels for internal oxidation. The improved surface microhardness is attributed to the formation of oxides.</p></div>","PeriodicalId":23191,"journal":{"name":"Transactions of Nonferrous Metals Society of China","volume":"34 7","pages":"Pages 2260-2274"},"PeriodicalIF":4.7,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1003632624665398/pdf?md5=9966fc369d5f03ad71d825c2de6dcc7d&pid=1-s2.0-S1003632624665398-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141838810","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

Numerical Simulation on Metallic Droplet Deformation and Breakup Concerning Particle Morphology and Hollow Particle Formation During Gas Atomization 关于气体雾化过程中金属液滴变形和破裂与颗粒形态和空心颗粒形成的数值模拟

IF 4.7 1区材料科学

Transactions of Nonferrous Metals Society of China Pub Date : 2024-07-01 DOI: 10.1016/S1003-6326(24)66526-X

Peng WANG , Xing-gang LI , Xiang-lin ZHOU , Zhi-pei CHEN , Miao-hui WANG , Ping GAN , Xiao-na REN , Zhi-yong YU

{"title":"Numerical Simulation on Metallic Droplet Deformation and Breakup Concerning Particle Morphology and Hollow Particle Formation During Gas Atomization","authors":"Peng WANG , Xing-gang LI , Xiang-lin ZHOU , Zhi-pei CHEN , Miao-hui WANG , Ping GAN , Xiao-na REN , Zhi-yong YU","doi":"10.1016/S1003-6326(24)66526-X","DOIUrl":"10.1016/S1003-6326(24)66526-X","url":null,"abstract":"<div><p>The deformation and breakup of metallic droplets during gas atomization were simulated using a volume of fluid (VOF) approach that considered droplet cooling and solidification. The correlation between the typical powder morphology and droplet breakup behavior was established to guide the preparation of spherical powder particles. The results showed that upon increasing the ratio of aerodynamic to viscous force of the droplet, the formation of spherical particles was enhanced, while upon decreasing this ratio, the expected droplet breakup mode changed or only droplet deformation occurred. Several typical scenarios were observed from the numerical simulations of the hollow particle formation and evolution process, e.g., open hollow film formation, film closure, bubble centrifugation, and bubble detachment. By increasing the gas velocity or droplet temperature, a higher non-equilibrium Laplace pressure or lower viscous forces was achieved, which separated the bubbles from the interior of the droplet.</p></div>","PeriodicalId":23191,"journal":{"name":"Transactions of Nonferrous Metals Society of China","volume":"34 7","pages":"Pages 2074-2094"},"PeriodicalIF":4.7,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S100363262466526X/pdf?md5=574066069cf8b186f5358bfd718835ae&pid=1-s2.0-S100363262466526X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141849157","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}

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