稀有金属材料与工程最新文献_第5页

Fabrication of g-C3N4/MoS2 Nanosheet Heterojunction by Facile Ball Milling Method and Its Visible Light Photocatalytic Performance 易球磨法制备g-C3N4/MoS2纳米片异质结及其可见光催化性能

IF 0.7 4区材料科学

稀有金属材料与工程 Pub Date : 2018-10-01 DOI: 10.1016/S1875-5372(18)30226-1

Yan Xin , Gao Qiang , Hui Xiaoyan , Yan Congxiang , Ai Tao , Wang Zhenjun , Sun Guodong , Su Xinghua , Zhao Peng

{"title":"Fabrication of g-C3N4/MoS2 Nanosheet Heterojunction by Facile Ball Milling Method and Its Visible Light Photocatalytic Performance","authors":"Yan Xin , Gao Qiang , Hui Xiaoyan , Yan Congxiang , Ai Tao , Wang Zhenjun , Sun Guodong , Su Xinghua , Zhao Peng","doi":"10.1016/S1875-5372(18)30226-1","DOIUrl":"10.1016/S1875-5372(18)30226-1","url":null,"abstract":"<div>The g-C3N4/MoS2 nanosheet heterojunction was prepared via a facile ball milling method. The microstructure and morphology of the composite were characterized by X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), UV-vis diffuse reflectance spectroscopy (DRS) and photoluminescence (PL) spectroscopy. The photocatalytic activities were evaluated by the degradation of organic Rhodamine B (RhB) under visible light irradiation. The results indicate that MoS2 nanosheets are successfully coupled into g-C3N4 to form a C3N4/MoS2 heterojunction. The kinetic constant of RhB degradation with g-C3N4/MoS2 nanosheets-2 wt% heterojunction (0.0368 min−1) is about 4.3 times as high as that of the bulk g-C3N4 (0.00840 min−1). The enhanced photocatalytic activities can be mainly ascribed to the efficient separation and transportation of photo-induced electron-hole pairs. The possible photocatalytic mechanism of composites was proposed according to the light trapping experiment.</div>","PeriodicalId":21056,"journal":{"name":"稀有金属材料与工程","volume":"47 10","pages":"Pages 3015-3020"},"PeriodicalIF":0.7,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1875-5372(18)30226-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81605106","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 16

Microscopic Phase-field Simulation for the Influence of Aging Process on the Precipitation Process of Ni75Al15Ti10 Alloy 时效过程对Ni75Al15Ti10合金析出过程影响的显微相场模拟

IF 0.7 4区材料科学

稀有金属材料与工程 Pub Date : 2018-10-01 DOI: 10.1016/S1875-5372(18)30224-8

Sun Yuanyang, Zhao Yuhong, Hou Hua, Zheng Xiaojuan, Guo Huijun

{"title":"Microscopic Phase-field Simulation for the Influence of Aging Process on the Precipitation Process of Ni75Al15Ti10 Alloy","authors":"Sun Yuanyang, Zhao Yuhong, Hou Hua, Zheng Xiaojuan, Guo Huijun","doi":"10.1016/S1875-5372(18)30224-8","DOIUrl":"10.1016/S1875-5372(18)30224-8","url":null,"abstract":"<div>The precipitation process of Ni75Al15Ti10 alloy was simulated by a microscopic phase-field kinetics model. The microscopic morphology evolution was studied, which indicates that the precipitation process can be divided into two stages: the first is the transformation from L10 phase to L12 phase, and the second is the formation of the stoichiometric L12 phase. The effect of single aging temperature on the microstructure, atomic occupation probability and atomic diffusion was investigated. The result shows that the shape of γ′ precipitates transforms from irregular shape to regular cuboid and the degree of orientation growth increases with increasing aging temperature. But the higher the aging temperature, the lower the occupation probability and the order degree. Meanwhile, the path of diffusion of Al atom is from the interface of the γ′ phase to the internal, and the diffusion of Ti atom is the opposite. Furthermore, we studied the dual aging to improve occupation probability of γ′ precipitates and to discuss their influence on the γ′ phase. Dual aging can not only obtain a stable γ′ phase with regular shape, but also increase the occupation probability of Al and Ti and inhibit the formation of anti-site defects.</div>","PeriodicalId":21056,"journal":{"name":"稀有金属材料与工程","volume":"47 10","pages":"Pages 3000-3007"},"PeriodicalIF":0.7,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1875-5372(18)30224-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81134384","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Thermodynamic Assessment of Co-Nb-W System Co-Nb-W体系热力学评价

IF 0.7 4区材料科学

稀有金属材料与工程 Pub Date : 2018-10-01 DOI: 10.1016/S1875-5372(18)30212-1

Liu Xingjun , Niu Zeming , Lu Yong , Guo Yihui , Han Jiajia , Chen Yuechao , Wang Cuiping

引用次数: 1

Transverse Tensile Properties of a Nickel-based Third Generation Single Crystal Superalloy 镍基第三代单晶高温合金的横向拉伸性能

IF 0.7 4区材料科学

稀有金属材料与工程 Pub Date : 2018-10-01 DOI: 10.1016/S1875-5372(18)30218-2

Yang Wanpeng, Li Jiarong, Liu Shizhong, Shi Zhenxue, Zhao Jinqian, Wang Xiaoguang

{"title":"Transverse Tensile Properties of a Nickel-based Third Generation Single Crystal Superalloy","authors":"Yang Wanpeng, Li Jiarong, Liu Shizhong, Shi Zhenxue, Zhao Jinqian, Wang Xiaoguang","doi":"10.1016/S1875-5372(18)30218-2","DOIUrl":"10.1016/S1875-5372(18)30218-2","url":null,"abstract":"<div>In the temperature range of 760 °C to 1100 °C, the transverse tensile properties of a nickel-based third generation single crystal superalloy were studied. The microstructures and fracture surfaces were observed by optical microscopy (OM), field emission scanning electron microscopy (FESEM) and scanning transmission electron microscopy (STEM). The results show that the tensile strength of the alloy decreases as the temperature increases, while the tensile elongation of the alloy increases with the temperature increasing. The fracture surfaces of the tensile ruptured specimens are characterized by quasi-cleavage features at 760 and 850 °C. In the temperature range of 980 °C to 1100 °C, dendrites characteristics exhibiting the solidification direction are observed on the fracture surfaces and the proportion of dendrites characteristic on the fracture surfaces increases with the temperature increasing. The fracture surface displays mixed quasi-cleavage and dimple features at 980 °C. The fracture surfaces are characterized by dimples at 1070 and 1100 °C. As the temperature increases, more slip systems tend to be activated during the plastic deformation, resulting in different dislocation configurations. At 760°C, high density a/2<110> dislocations are found to be of a roughly parallel distribution with each other in the tensile ruptured specimens. The dislocations are observed to be tangled at 980 °C and dislocation networks have formed at 1100 °C.</div>","PeriodicalId":21056,"journal":{"name":"稀有金属材料与工程","volume":"47 10","pages":"Pages 2964-2969"},"PeriodicalIF":0.7,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1875-5372(18)30218-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89054000","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Microstructure and Corrosion Properties of Calcium Phosphate Coating on Magnesium Alloy Prepared by Hydrothermal Treatment at Various pH Values 不同pH值下水热法制备镁合金表面磷酸钙涂层的组织与腐蚀性能

IF 0.7 4区材料科学

稀有金属材料与工程 Pub Date : 2018-10-01 DOI: 10.1016/S1875-5372(18)30223-6

Zhang Chunyan , Zhang Shiyu , Liu Xinpeng , He Hongchuan

{"title":"Microstructure and Corrosion Properties of Calcium Phosphate Coating on Magnesium Alloy Prepared by Hydrothermal Treatment at Various pH Values","authors":"Zhang Chunyan , Zhang Shiyu , Liu Xinpeng , He Hongchuan","doi":"10.1016/S1875-5372(18)30223-6","DOIUrl":"10.1016/S1875-5372(18)30223-6","url":null,"abstract":"<div>Calcium phosphate (Ca-P) coatings were deposited on AZ31 magnesium by hydrothermal treatment at various pH values to improve the corrosion resistance and biocompatibility of magnesium alloys. The crystal phase, morphology and composition of the coatings were investigated by XRD, SEM and EDS, respectively. Electrochemical measurements and immersion tests were performed in Hank's solution to examine the bio-corrosion behaviors of the coated specimens. The results show that the pH value of solutions influences the phase composition and microstructure of the coating. And the degree of protection provided by the Ca-P coating varies with its microstructure. The deposited Ca-P coating treated at pH=6 is composed of OCP (Ca8H2(PO4)6·5H2O). When the pH value increases to 8 and 10, only the HA is formed. The HA coating with nano-scale and rod-like crystals prepared at pH=10 can prevent the penetration of solution more effectively than the OCP coating at pH=6 and the honeycomb-like HA coating at pH=8.</div>","PeriodicalId":21056,"journal":{"name":"稀有金属材料与工程","volume":"47 10","pages":"Pages 2993-2999"},"PeriodicalIF":0.7,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1875-5372(18)30223-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77604893","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

Effect of Zn Content on the Microstructure and Mechanical Properties of the Extruded Mg-6Gd-4Y (wt%) Alloy Zn含量对挤压Mg-6Gd-4Y (wt%)合金组织和力学性能的影响

IF 0.7 4区材料科学

稀有金属材料与工程 Pub Date : 2018-10-01 DOI: 10.1016/S1875-5372(18)30217-0

Zhen Rui , Sun Yangshan , Shen Xuewei

{"title":"Effect of Zn Content on the Microstructure and Mechanical Properties of the Extruded Mg-6Gd-4Y (wt%) Alloy","authors":"Zhen Rui , Sun Yangshan , Shen Xuewei","doi":"10.1016/S1875-5372(18)30217-0","DOIUrl":"10.1016/S1875-5372(18)30217-0","url":null,"abstract":"<div>Microstructures and mechanical properties of the Mg-6Gd-4Y (wt%) alloys with and without 1wt% Zn additions were investigated. The results show that the as-cast microstructure of the Mg-6Gd-4Y alloy consist of α-Mg matrix and Mg24(GdY)5 secondary phase. However, the as-cast microstructure of the Zn-containing Mg-6Gd-4Y-1Zn alloy consist of α-Mg matrix, Mg24(GdY)5 secondary phase and Mg12Y1Zn1 phase which has a 18R long period staking ordered (18R-LPSO) structure. After extrusion a 14H-LPSO phase is found in the Zn-containing alloy which is distributed between the 18R-LPSO strips in the as extruded microstructure. The formation mechanism of the 14H-LPSO phase is precipitation, and the reaction can be expressed as ‘α-Mg′ → α-Mg+14H’. Zn content has no obvious effect on the precipitation of β series. Aged (T6 and T5 treatment) conducted on both the Mg-6Gd-4Y alloy and the Mg-6Gd-4Y-1Zn alloy causes the formation of β′ precipitates. The T6-aged Mg-6Gd-4Y-1Zn alloy exhibits high tensile strength combined with good ductility, and the values of the yield strength (YS), ultimate tensile strength (UTS) and elongation are 309 MPa, 438 MPa and 6.8%, respectively. It is due to the coexistence of 18R-LPSO phase and finely dispersed distribution of the 14H-LPSO phase and the β′ precipitates in the microstructure.</div>","PeriodicalId":21056,"journal":{"name":"稀有金属材料与工程","volume":"47 10","pages":"Pages 2957-2963"},"PeriodicalIF":0.7,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1875-5372(18)30217-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81738854","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Microstructure and Tensile Property of Electromagnetic Stirring Assisted Laser Repaired Inconel718 Superalloy 电磁搅拌辅助激光修复Inconel718高温合金的组织与拉伸性能

IF 0.7 4区材料科学

稀有金属材料与工程 Pub Date : 2018-10-01 DOI: 10.1016/S1875-5372(18)30216-9

Cheng Hongmao , Liu Fencheng , Yang Guang , Zhong Chao , Lin Xin , Huang Chunping

{"title":"Microstructure and Tensile Property of Electromagnetic Stirring Assisted Laser Repaired Inconel718 Superalloy","authors":"Cheng Hongmao , Liu Fencheng , Yang Guang , Zhong Chao , Lin Xin , Huang Chunping","doi":"10.1016/S1875-5372(18)30216-9","DOIUrl":"10.1016/S1875-5372(18)30216-9","url":null,"abstract":"<div>Inconel718 superalloy samples with V-grooves were experimentally repaired by electromagnetic stirring assisted laser repairing (EMS-LR) under different magnetic field currents. The effects of the magnetic field current on morphologies of single pass repaired zone (RZ), microstructure and mechanical properties of multilayer RZ were experimentally investigated. Microstructure observations show that metallurgical bonding is obtained between the RZ and the substrate when the optimized process parameter is used. The microstructure in RZ is coarse columnar crystal when no electromagnetic stirring is used, which grows epitaxially along the deposition direction. With the increase of magnetic field current, the convection of liquid metals prompts the transformation from coarse columnar to fine equiaxed grains. The strong scour of liquid metal convection can affect the interdendritic γ+Laves eutectic reaction and prohibit the growth of Laves phase. Electromagnetic stirring can improve the spreading of liquid metal in a certain extent. The width and deposition height of the single trace were measured and it is found that the width and deposition height ratio changes from 3.26 when no electromagnetic stirring is used to 3.33, 4.14 and 5.14 when the applied magnetic field current is 20, 40 and 60 A, respectively, and the penetration is found to be decreased inversely. The tensile strengths of repaired components increase from 487 MPa to 510, 673 and 770 MPa for magnetic field currents of 0, 20, 40 and 60 A, respectively.</div>","PeriodicalId":21056,"journal":{"name":"稀有金属材料与工程","volume":"47 10","pages":"Pages 2949-2956"},"PeriodicalIF":0.7,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1875-5372(18)30216-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86511355","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Effect of Temperature on Corrosion Behavior of 304 Stainless Steel in Liquid Sn 温度对304不锈钢在液态锡中腐蚀行为的影响

IF 0.7 4区材料科学

稀有金属材料与工程 Pub Date : 2018-09-01 DOI: 10.1016/S1875-5372(18)30202-9

Chen Jiajun, Song Xiping, Wang Han, Liu Jingru

引用次数: 2

Effects of Point Defects on Properties of B2 NiAl: A First-principles Study 点缺陷对B2 NiAl材料性能影响的第一性原理研究

IF 0.7 4区材料科学

稀有金属材料与工程 Pub Date : 2018-09-01 DOI: 10.1016/S1875-5372(18)30210-8

Niu Xiaofeng , Huang Zhiwei , Wang Baojian , Wang Chenchen , Song Zhenliang

{"title":"Effects of Point Defects on Properties of B2 NiAl: A First-principles Study","authors":"Niu Xiaofeng , Huang Zhiwei , Wang Baojian , Wang Chenchen , Song Zhenliang","doi":"10.1016/S1875-5372(18)30210-8","DOIUrl":"https://doi.org/10.1016/S1875-5372(18)30210-8","url":null,"abstract":"<div>The basic properties, heats of formation, energies of formation, equilibrium concentration of point defects, elastic properties, and electronic structures for point defect structures of B2-NiAl crystal were analyzed by the density functional theory. Compared with B2-NiAl and other B2 intermetallic compounds, purity NiAl has better ductility and bonding strength. According to the calculated heats of formation, energies of formation, and equilibrium concentration of point defects, the Ni antisite and Ni vacancy are primary defects in B2-NiAl crystal. The calculated G/B0 and Cauchy pressure parameters C12-C44 values confirm that Ni vacancy, Ni antisite, and Al antisite can promote the brittleness of B2-NiAl, in which Ni vacancy is the primary defect, while Al vacancy with a low concentration can improve ductility of B2-NiAl. The density of state confirms that B2-NiAl intermetallic compounds are conductors, and point defects can promote the stability of the system expect Ni antisite defect.</div>","PeriodicalId":21056,"journal":{"name":"稀有金属材料与工程","volume":"47 9","pages":"Pages 2687-2692"},"PeriodicalIF":0.7,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91691413","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of Rare Earth Pr on Creep Behavior of Sn-0.3Ag-0.7Cu-0.5Ga Low-Ag Solder Alloys 稀土Pr对Sn-0.3Ag-0.7Cu-0.5Ga低银钎料合金蠕变行为的影响

IF 0.7 4区材料科学

稀有金属材料与工程 Pub Date : 2018-09-01 DOI: 10.1016/S1875-5372(18)30205-4

Wang Bo, Xue Songbai, W. Jianxin, Long Weimin, Zhang Qingke

引用次数: 7