{"title":"Observations on the intersection between {1011} and {1012} twin in deformed magnesium alloy","authors":"G. Xi, J. Zhang, J. Wu, J. Jia, Y. Zhi","doi":"10.4149/km_2021_4_231","DOIUrl":"https://doi.org/10.4149/km_2021_4_231","url":null,"abstract":"","PeriodicalId":18519,"journal":{"name":"Metallic Materials","volume":"103 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79174975","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
S. Liu, Y. Sima, L. Zhang, J. Zhang, W. Qiao, Q. Yuan
{"title":"Study on the mechanical properties, wear resistance and microstructure of nano-SiCp/ZA38 composite material under the synergistic effects of thermal-force-acoustic field","authors":"S. Liu, Y. Sima, L. Zhang, J. Zhang, W. Qiao, Q. Yuan","doi":"10.4149/km_2021_5_303","DOIUrl":"https://doi.org/10.4149/km_2021_5_303","url":null,"abstract":"","PeriodicalId":18519,"journal":{"name":"Metallic Materials","volume":"205 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77750128","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Effect of solidification parameters on microsegregation behaviour of main alloying elements in a peritectic TiAl based alloy","authors":"A. Klimová, J. Lapin, T. Pelachová, M. Nosko","doi":"10.4149/km_2013_2_89","DOIUrl":"https://doi.org/10.4149/km_2013_2_89","url":null,"abstract":"","PeriodicalId":18519,"journal":{"name":"Metallic Materials","volume":"19 3 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89445854","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Investigation of mechanical and microstructural properties of AA5754/AA6013 dissimilar aluminium alloys joined by GMAW and FSW methods","authors":"A. Yürük, Y. Ayan, B. Çevik, N. Kahraman","doi":"10.4149/km_2021_4_245","DOIUrl":"https://doi.org/10.4149/km_2021_4_245","url":null,"abstract":"","PeriodicalId":18519,"journal":{"name":"Metallic Materials","volume":"16 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86552461","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"The effects of process parameters on the surface form of laser engraved H13 tool steel","authors":"Ş. Kasman, I. Saklakoğlu","doi":"10.4149/KM_2013_5_317","DOIUrl":"https://doi.org/10.4149/KM_2013_5_317","url":null,"abstract":"","PeriodicalId":18519,"journal":{"name":"Metallic Materials","volume":"126 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76716637","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ferromanganese (FeMn) is an alloy that is generally used to increase the wear resistance of steels and can be produced with high energy systems. In this study, the material produced by the metallothermic reduction method and a serious energy saving is achieved. In studies conducted for FeMn production, optimum recovery conditions were determined for varying aluminum stoichiometries. In addition, mill scale was used as a source to obtain the Fe structure in the alloy, and waste material was evaluated. In addition, magnetite was used as a source of iron oxide, and the recovery values of these products were compared with the mill scale. The characterization of the produced materials was determined by XRD, optical microscope and hardness methods. According to the results, the highest recovery is 110 % Al stoc. with magnetite, 98.58 % for Fe, and 85 % for Mn. The hardness value of the same sample gave the highest result with 64.65 HRC. K e y w o r d s: FeMn, mill scale, recycling, metallothermic reduction, combustion synthesis, thermodynamic modeling
{"title":"Effect of mill scale usage on thermodynamic modeling and metallothermic production of FeMn alloys","authors":"M. Buğdaycı","doi":"10.4149/km_2021_3_187","DOIUrl":"https://doi.org/10.4149/km_2021_3_187","url":null,"abstract":"Ferromanganese (FeMn) is an alloy that is generally used to increase the wear resistance of steels and can be produced with high energy systems. In this study, the material produced by the metallothermic reduction method and a serious energy saving is achieved. In studies conducted for FeMn production, optimum recovery conditions were determined for varying aluminum stoichiometries. In addition, mill scale was used as a source to obtain the Fe structure in the alloy, and waste material was evaluated. In addition, magnetite was used as a source of iron oxide, and the recovery values of these products were compared with the mill scale. The characterization of the produced materials was determined by XRD, optical microscope and hardness methods. According to the results, the highest recovery is 110 % Al stoc. with magnetite, 98.58 % for Fe, and 85 % for Mn. The hardness value of the same sample gave the highest result with 64.65 HRC. K e y w o r d s: FeMn, mill scale, recycling, metallothermic reduction, combustion synthesis, thermodynamic modeling","PeriodicalId":18519,"journal":{"name":"Metallic Materials","volume":"11 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76867492","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. Ehsani, H. M. Shiri, M. G. Mahjani, R. Moshrefi, R. Safari
1-(2,4-Dimethylphenyl)-5-amino-1H-tetrazole (DAT) nanoparticles were synthesized, and its inhibiting action on the corrosion of Aluminum AA1005 alloy (Al) in sulfuric acid was investigated using potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). Inhibition efficiency increases as inhibitor concentration increases. A good correlation was observed between the potentiodynamic studies and electrochemical impedance spectroscopy with electrochemical noise measurements. Hence, it seems that the electrochemical noise (EN) method can be applied as a complementary quantitative technique to study the corrosion behavior of inhibitors. The effect of inhibitor concentration on the interpretation of noise resistance and spectral noise impedance was evaluated. Furthermore, quantum chemical calculations were employed to provide further insight into the mechanism of inhibition by DAT. It was shown that the adsorption of inhibitors on the AA1005 surface takes place through both physical and chemical adsorption. The best fit to the experimental data was obtained using Langmuir adsorption isotherm. K e y w o r d s: aluminum, polarization, impedance, electrochemical noise, adsorption, nanostructure
{"title":"Inhibitory effect of new azole derivative in the corrosion of aluminum in acidic medium: common electrochemical and electrochemical noise investigation","authors":"A. Ehsani, H. M. Shiri, M. G. Mahjani, R. Moshrefi, R. Safari","doi":"10.4149/KM_2016_3_233","DOIUrl":"https://doi.org/10.4149/KM_2016_3_233","url":null,"abstract":"1-(2,4-Dimethylphenyl)-5-amino-1H-tetrazole (DAT) nanoparticles were synthesized, and its inhibiting action on the corrosion of Aluminum AA1005 alloy (Al) in sulfuric acid was investigated using potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). Inhibition efficiency increases as inhibitor concentration increases. A good correlation was observed between the potentiodynamic studies and electrochemical impedance spectroscopy with electrochemical noise measurements. Hence, it seems that the electrochemical noise (EN) method can be applied as a complementary quantitative technique to study the corrosion behavior of inhibitors. The effect of inhibitor concentration on the interpretation of noise resistance and spectral noise impedance was evaluated. Furthermore, quantum chemical calculations were employed to provide further insight into the mechanism of inhibition by DAT. It was shown that the adsorption of inhibitors on the AA1005 surface takes place through both physical and chemical adsorption. The best fit to the experimental data was obtained using Langmuir adsorption isotherm. K e y w o r d s: aluminum, polarization, impedance, electrochemical noise, adsorption, nanostructure","PeriodicalId":18519,"journal":{"name":"Metallic Materials","volume":"29 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78214501","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This paper aims to investigate the abrasive wear behavior of the sol-gel coated B4C particulate reinforced aluminum metal matrix composite. Sliding wear is related to asperity-to-asperity contact of two counter surfaces, which are in relative motion against each other. The effective wear from the specimen surface is due to the combined effect of a number of factors. An increase in the applied load leads to increase in penetration of hard asperities of the counter surface to the softer pin surface, increase in micro cracking tendency of the subsurface and also increase in the deformation and fracture of asperities of the softer surface. In general, composites offer superior wear resistance as compared to the alloy irrespective of applied load and B4C particles volume fraction. This is primarily due to the presence of the hard dispersoid which protects the matrix from severe contact with the counter surfaces, and thus results in less wear, lower coefficient friction and temperature rise in composite as compared to that in the alloy. The worn surfaces of all specimens were covered with grooves parallel to the sliding direction and some plastic deformations. These grooves are typical features associated with abrasive wear, in which hard asperities on the steel counter face or hard particles between the pin and disc, plough or cut into the pin cause wear by the removal of the material. Plastic deformation, material smearing, cavities and craters imply adhesive wear. K e y w o r d s: dry sliding, adhesive, mechanically mixed layer
{"title":"Investigating the effect of reinforcing particulates on the weight loss and worn surface of compocast AMCs","authors":"A. Mazahery, M. Shabani","doi":"10.4149/km_2013_1_11","DOIUrl":"https://doi.org/10.4149/km_2013_1_11","url":null,"abstract":"This paper aims to investigate the abrasive wear behavior of the sol-gel coated B4C particulate reinforced aluminum metal matrix composite. Sliding wear is related to asperity-to-asperity contact of two counter surfaces, which are in relative motion against each other. The effective wear from the specimen surface is due to the combined effect of a number of factors. An increase in the applied load leads to increase in penetration of hard asperities of the counter surface to the softer pin surface, increase in micro cracking tendency of the subsurface and also increase in the deformation and fracture of asperities of the softer surface. In general, composites offer superior wear resistance as compared to the alloy irrespective of applied load and B4C particles volume fraction. This is primarily due to the presence of the hard dispersoid which protects the matrix from severe contact with the counter surfaces, and thus results in less wear, lower coefficient friction and temperature rise in composite as compared to that in the alloy. The worn surfaces of all specimens were covered with grooves parallel to the sliding direction and some plastic deformations. These grooves are typical features associated with abrasive wear, in which hard asperities on the steel counter face or hard particles between the pin and disc, plough or cut into the pin cause wear by the removal of the material. Plastic deformation, material smearing, cavities and craters imply adhesive wear. K e y w o r d s: dry sliding, adhesive, mechanically mixed layer","PeriodicalId":18519,"journal":{"name":"Metallic Materials","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72977336","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The permanence of powder preform forged steels on higher order applications such as automobile, aerospace, ordnance industries with elevated temperature and strength is being sustained by implementing various heat treatment progresses. Different heat treatment schedules after the forged preforms of AISI 8620 steel produced through conventional powder metallurgy route were analysed for its mechanical strength, fractography, and microstructure properties. Green compacts were prepared in the pressure range of 540± 10 MPa and sintered in the electrical muffle furnace at 1150± 10◦C for 120 min. Sintered compacts were hot upset forged into square cross section bars. Some bars were quenched in the water medium, and other sets of samples were cooled inside the furnace and in still air. Kinetics of the cooling velocities highly influences the tensile and impact properties improvement with determined microstructure and fractographic features. K e y w o r d s: perform, forged, heat treatment, property, quenching, testing
{"title":"Diverse cooling schedules to improved physico-mechanical properties of hot upset forged AISI 8620 PM steel bars","authors":"Y. G. Bala, S. Sankaranarayanan, K. Pandey","doi":"10.4149/KM_2016_3_219","DOIUrl":"https://doi.org/10.4149/KM_2016_3_219","url":null,"abstract":"The permanence of powder preform forged steels on higher order applications such as automobile, aerospace, ordnance industries with elevated temperature and strength is being sustained by implementing various heat treatment progresses. Different heat treatment schedules after the forged preforms of AISI 8620 steel produced through conventional powder metallurgy route were analysed for its mechanical strength, fractography, and microstructure properties. Green compacts were prepared in the pressure range of 540± 10 MPa and sintered in the electrical muffle furnace at 1150± 10◦C for 120 min. Sintered compacts were hot upset forged into square cross section bars. Some bars were quenched in the water medium, and other sets of samples were cooled inside the furnace and in still air. Kinetics of the cooling velocities highly influences the tensile and impact properties improvement with determined microstructure and fractographic features. K e y w o r d s: perform, forged, heat treatment, property, quenching, testing","PeriodicalId":18519,"journal":{"name":"Metallic Materials","volume":"6 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74505429","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this study, AISI 430/AISI 1040 steel couple 10 mm thick were welded in the butt position without any pre-treatment using keyhole plasma transferred arc (KPTA) process. Welded joints were manufactured selecting constant welding speed (0.01 mmin−1) and two different nozzle orifice diameters (2.4 and 3.2 mm), three different welding currents (130, 135 and 140 A), at a constant plasma gas flow (1.2 l min−1), a shielding gas flow (25 l min−1). The microstructural changes that occurred in the interface regions of the welded samples were examined by microhardness, scanning electron microscopy (SEM), X-ray diffraction (XRD) and energy dispersive spectrometer (EDS). In order to determine mechanical properties of samples, the V-notch Charpy tests were performed. In addition, fracture types in the notch impact strength tests of samples were determined from the fractographic examinations using SEM. K e y w o r d s: plasma transferred arc welding, keyhole, AISI 430, AISI 1040, nozzle orifice diameter
在本研究中，采用不进行任何预处理的锁孔等离子转移电弧(KPTA)工艺，在对接位置焊接了10 mm厚的AISI 430/AISI 1040钢对。在恒定的等离子体气体流量(1.2 l min - 1)和保护气体流量(25 l min - 1)下，选择恒定的焊接速度(0.01 mm - 1)、两种不同的喷嘴直径(2.4 mm和3.2 mm)、三种不同的焊接电流(130、135和140 A)来制造焊接接头。采用显微硬度、扫描电子显微镜(SEM)、x射线衍射仪(XRD)和能谱仪(EDS)分析了焊接试样界面区微观组织的变化。为了确定试样的力学性能，进行了v形缺口夏比试验。此外，通过扫描电镜的断口分析，确定了试样缺口冲击强度试验中的断裂类型。焊接工艺:等离子转移弧焊，锁孔，AISI 430, AISI 1040，喷嘴孔径
{"title":"The effect of nozzle orifice diameter on penetration depth and mechanical properties of AISI430/AISI1040 dissimilar steel joined by keyhole PTA welding process","authors":"T. Teker, N. Özdemir","doi":"10.4149/km_2013_4_241","DOIUrl":"https://doi.org/10.4149/km_2013_4_241","url":null,"abstract":"In this study, AISI 430/AISI 1040 steel couple 10 mm thick were welded in the butt position without any pre-treatment using keyhole plasma transferred arc (KPTA) process. Welded joints were manufactured selecting constant welding speed (0.01 mmin−1) and two different nozzle orifice diameters (2.4 and 3.2 mm), three different welding currents (130, 135 and 140 A), at a constant plasma gas flow (1.2 l min−1), a shielding gas flow (25 l min−1). The microstructural changes that occurred in the interface regions of the welded samples were examined by microhardness, scanning electron microscopy (SEM), X-ray diffraction (XRD) and energy dispersive spectrometer (EDS). In order to determine mechanical properties of samples, the V-notch Charpy tests were performed. In addition, fracture types in the notch impact strength tests of samples were determined from the fractographic examinations using SEM. K e y w o r d s: plasma transferred arc welding, keyhole, AISI 430, AISI 1040, nozzle orifice diameter","PeriodicalId":18519,"journal":{"name":"Metallic Materials","volume":"39 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75312176","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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