Pub Date : 2023-03-15DOI: 10.1080/10667857.2023.2189769
R. Misra
ABSTRACT Magnesium (Mg) alloys are difficult to cold/warm-process due to their hexagonal close-packed (HCP) lattice, which has restricted slip systems and makes plastic deformation at low temperatures a challenging task. Multi-axial forging (MAF) and annealing of as-cast alloys were combined to create a texture-free ultrafine-grained (UFG) structure with a high strength-high ductility combination to address this challenge. The study showed a clear and fundamental change from basal and pyramidal dislocation slip to twinning in the strong and ductile UFG Mg alloy compared to the low strength coarse-grained (CG) Mg alloy counterpart. This implied that the dislocation activity, grain orientation, and particular grain boundary states played an important role in controlling the deformation mechanisms. The potential impact of processing Mg alloys by MAF opens-up a new frontier of strong and ductile low-density materials for light and efficient solutions including energy absorption and formability and provides a perspective in terms of process-structure-property relationship.
{"title":"Enabling manufacturing of multi-axial forging-induced ultrafine-grained strong and ductile magnesium alloys: a perspective of process-structure-property paradigm","authors":"R. Misra","doi":"10.1080/10667857.2023.2189769","DOIUrl":"https://doi.org/10.1080/10667857.2023.2189769","url":null,"abstract":"ABSTRACT Magnesium (Mg) alloys are difficult to cold/warm-process due to their hexagonal close-packed (HCP) lattice, which has restricted slip systems and makes plastic deformation at low temperatures a challenging task. Multi-axial forging (MAF) and annealing of as-cast alloys were combined to create a texture-free ultrafine-grained (UFG) structure with a high strength-high ductility combination to address this challenge. The study showed a clear and fundamental change from basal and pyramidal dislocation slip to twinning in the strong and ductile UFG Mg alloy compared to the low strength coarse-grained (CG) Mg alloy counterpart. This implied that the dislocation activity, grain orientation, and particular grain boundary states played an important role in controlling the deformation mechanisms. The potential impact of processing Mg alloys by MAF opens-up a new frontier of strong and ductile low-density materials for light and efficient solutions including energy absorption and formability and provides a perspective in terms of process-structure-property relationship.","PeriodicalId":18270,"journal":{"name":"Materials Technology","volume":"58 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2023-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86598384","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}
ABSTRACT Coordination reaction is a usual way for the concentration of metal ions in aqueous solution. In this work, 5-(5-iodine-2-pyridine azo)-2,2 amie toluene (5-PADAT) was firstly casting onto carbon glass electrode (GCE), play a role of ‘bait’; then, immersed 5-PADAT modified GCE into immersed aqueous solution containing order of magnitude ppm Palladium ions (Pd2+, play a role of ‘fishes’); ‘Fishes’ were captured by ‘bait’ with the reaction process of 5-PADAT and Pd2+, leading to the concentration of Pd2+ onto the GCE; Cyclic voltammetry was employed to reduce Pd2+ in situ, formed Pd nanoparticles (PdNPs) modified GCE. It can be used to detect the oxidation of hydrazine hydrate at a very low potential, 0.1 V.
{"title":"Novel hydrazine hydrate sensor based on”fish-bait” capture mode","authors":"Yaping He, Kexin Zhang, Xinchu Li, Q. Han, Yanyan Huo, Xiaohui Yang, Changhu Zhang","doi":"10.1080/10667857.2023.2190231","DOIUrl":"https://doi.org/10.1080/10667857.2023.2190231","url":null,"abstract":"ABSTRACT Coordination reaction is a usual way for the concentration of metal ions in aqueous solution. In this work, 5-(5-iodine-2-pyridine azo)-2,2 amie toluene (5-PADAT) was firstly casting onto carbon glass electrode (GCE), play a role of ‘bait’; then, immersed 5-PADAT modified GCE into immersed aqueous solution containing order of magnitude ppm Palladium ions (Pd2+, play a role of ‘fishes’); ‘Fishes’ were captured by ‘bait’ with the reaction process of 5-PADAT and Pd2+, leading to the concentration of Pd2+ onto the GCE; Cyclic voltammetry was employed to reduce Pd2+ in situ, formed Pd nanoparticles (PdNPs) modified GCE. It can be used to detect the oxidation of hydrazine hydrate at a very low potential, 0.1 V.","PeriodicalId":18270,"journal":{"name":"Materials Technology","volume":"38 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2023-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90279992","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}
Pub Date : 2023-03-08DOI: 10.1080/10667857.2023.2181680
L. Wang, Jun Yu Li, Z. Liu, S.F. Li, Y.F. Yang, R. Misra, Z. Tian
ABSTRACT A Ti3C2 MXene/Ti composite powder was developed through surface modification and powder coating for producing a high-performance titanium matrix composites (TMCs) by laser power bed fusion. Introducing MXene rarely changed the original sphericity and flowability of Ti powder while it slightly enhanced the laser absorption capacity of Ti powder. The printing conditions in turn affected the morphology and distribution of MXene in as-printed composites. At optimised printing parameters, majority of MXene with high structural integrity and uniform distribution remained along the grain boundaries of as-printed composites, and a combination of high surface quality, geometrical accuracy and densification was obtained. The remaining MXene played the synergy of pulling-out effect and load transfer role, which increased the yield strength from 530 to 710 MPa, while retaining good ductility (elongation of 19.8%). Compared with ASTM standard cast Ti64 alloy, our MXene/Ti composites also exhibited superior comprehensive tensile properties and excellent strength-ductility synergy.
{"title":"Towards strength-ductility synergy in nanosheets strengthened titanium matrix composites through laser power bed fusion of MXene/Ti composite powder","authors":"L. Wang, Jun Yu Li, Z. Liu, S.F. Li, Y.F. Yang, R. Misra, Z. Tian","doi":"10.1080/10667857.2023.2181680","DOIUrl":"https://doi.org/10.1080/10667857.2023.2181680","url":null,"abstract":"ABSTRACT A Ti3C2 MXene/Ti composite powder was developed through surface modification and powder coating for producing a high-performance titanium matrix composites (TMCs) by laser power bed fusion. Introducing MXene rarely changed the original sphericity and flowability of Ti powder while it slightly enhanced the laser absorption capacity of Ti powder. The printing conditions in turn affected the morphology and distribution of MXene in as-printed composites. At optimised printing parameters, majority of MXene with high structural integrity and uniform distribution remained along the grain boundaries of as-printed composites, and a combination of high surface quality, geometrical accuracy and densification was obtained. The remaining MXene played the synergy of pulling-out effect and load transfer role, which increased the yield strength from 530 to 710 MPa, while retaining good ductility (elongation of 19.8%). Compared with ASTM standard cast Ti64 alloy, our MXene/Ti composites also exhibited superior comprehensive tensile properties and excellent strength-ductility synergy.","PeriodicalId":18270,"journal":{"name":"Materials Technology","volume":"55 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2023-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80438687","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}
Pub Date : 2023-02-17DOI: 10.1080/10667857.2023.2176971
I. Muhammad, Xiaoming Yu, Qingchuan Wang, Yanfang Li, Wei-rong Li, L. Tan, Ke Yang
ABSTRACT Mg coating is one of the viable options for Ti to enhance its bioactivity. However, the rapid corrosion of Mg coating in physiological conditions has delayed their introduction for therapeutic applications to date. In this study, a ceramic layer between Ti substrate and Mg coating was prepared and heat treatment was also carried out to improve the corrosion resistance of the Mg coating. The in vitro test revealed that the ceramics layer decreased the galvanic corrosion between the Mg coatings and substrate, improved the corrosion resistance and wear properties. Furthermore, the post-heat treatment of Mg coating on Ti had a significant effect on the surface morphology and microstructure of the coating. The heat-treated Mg coatings on Ti at 400 °C for 10 min substrates showed an improved corrosion resistance compared with the untreated substrate. The heat treatment significantly influenced the hardness, adhesion, friction coefficient, and wear resistance of the coating.
{"title":"Enhancing corrosion and wear resistance of Mg coating on titanium implants by micro-arc oxidation and heat treatment","authors":"I. Muhammad, Xiaoming Yu, Qingchuan Wang, Yanfang Li, Wei-rong Li, L. Tan, Ke Yang","doi":"10.1080/10667857.2023.2176971","DOIUrl":"https://doi.org/10.1080/10667857.2023.2176971","url":null,"abstract":"ABSTRACT Mg coating is one of the viable options for Ti to enhance its bioactivity. However, the rapid corrosion of Mg coating in physiological conditions has delayed their introduction for therapeutic applications to date. In this study, a ceramic layer between Ti substrate and Mg coating was prepared and heat treatment was also carried out to improve the corrosion resistance of the Mg coating. The in vitro test revealed that the ceramics layer decreased the galvanic corrosion between the Mg coatings and substrate, improved the corrosion resistance and wear properties. Furthermore, the post-heat treatment of Mg coating on Ti had a significant effect on the surface morphology and microstructure of the coating. The heat-treated Mg coatings on Ti at 400 °C for 10 min substrates showed an improved corrosion resistance compared with the untreated substrate. The heat treatment significantly influenced the hardness, adhesion, friction coefficient, and wear resistance of the coating.","PeriodicalId":18270,"journal":{"name":"Materials Technology","volume":"410 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2023-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79847513","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}
Pub Date : 2023-02-06DOI: 10.1080/10667857.2023.2174797
P. Zhao, Chongxiang Di, Tong Zhang, Minqing Wang
ABSTRACT The paper describes high cycle rotational bending fatigue (HCF) performance and fracture characteristics of 718Plus alloy at 600°C and 700°C, where the relationship between maximum cyclic stress (S) and fatigue cycles (N) at 600°C and 700°C is explored. We drew S-N curves, and established mathematical model, with simulating S-N curve function. The crack initiation of smooth specimens focus on the surface or subsurface, where the stress concentration caused by inclusions, carbides and microstructure defects, leading to tearing, and inclusion is the main form of crack initiation. In addition, the high cycle fatigue life of 718Plus alloy is greatly affected by the microstructure defects. According to the analysis of high cycle fatigue fracture morphology, at 700°C, the alloy fatigue crack growth is faster, and the number of secondary cracks is more than 600°C. Thus, the growth behaviour is greatly affected by temperature.
{"title":"Fatigue behavior and fracture characteristics of 718Plus nickel-based superalloy at high temperature","authors":"P. Zhao, Chongxiang Di, Tong Zhang, Minqing Wang","doi":"10.1080/10667857.2023.2174797","DOIUrl":"https://doi.org/10.1080/10667857.2023.2174797","url":null,"abstract":"ABSTRACT The paper describes high cycle rotational bending fatigue (HCF) performance and fracture characteristics of 718Plus alloy at 600°C and 700°C, where the relationship between maximum cyclic stress (S) and fatigue cycles (N) at 600°C and 700°C is explored. We drew S-N curves, and established mathematical model, with simulating S-N curve function. The crack initiation of smooth specimens focus on the surface or subsurface, where the stress concentration caused by inclusions, carbides and microstructure defects, leading to tearing, and inclusion is the main form of crack initiation. In addition, the high cycle fatigue life of 718Plus alloy is greatly affected by the microstructure defects. According to the analysis of high cycle fatigue fracture morphology, at 700°C, the alloy fatigue crack growth is faster, and the number of secondary cracks is more than 600°C. Thus, the growth behaviour is greatly affected by temperature.","PeriodicalId":18270,"journal":{"name":"Materials Technology","volume":"1 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2023-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82976318","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}
Pub Date : 2023-02-06DOI: 10.1080/10667857.2023.2172991
H. Ning, Xiaoyan Li, L. Meng, A. Jiang, B. Ya, Shengchen Ji, Weiping Zhang, Jizhu Du, Xingguo Zhang
ABSTRACT Alloying elements (Ni, Mo) were added to grey cast iron, and the effect of Ni, Mo on microstructure and mechanical properties were analysed in this study. When Ni was added alone, the precipitation of graphite was inhibited at the early stage of solidification, and part of graphite was formed between the dendrites, resulted in an uneven distribution of graphite. Ni played a role of solution strengthening and reduced the pearlite interlammer spacing, improved the mechanical properties. The addition of Mo refined the austenite dendrites and made the carbon unevenly distributed, which led to the abnormal growth of graphite. Mo increased the eutectoid supercooling degree, reduced the pearlite interlammer spacing and improved tensile strength. When Ni and Mo were added together, the elements beneficial to strength (Mo, Sn) were not uniformly distributed, and the influence on graphite size and pearlite interlammer spacing was not obvious, resulted in poor mechanical properties.
{"title":"Effect of Ni and Mo on microstructure and mechanical properties of grey cast iron","authors":"H. Ning, Xiaoyan Li, L. Meng, A. Jiang, B. Ya, Shengchen Ji, Weiping Zhang, Jizhu Du, Xingguo Zhang","doi":"10.1080/10667857.2023.2172991","DOIUrl":"https://doi.org/10.1080/10667857.2023.2172991","url":null,"abstract":"ABSTRACT Alloying elements (Ni, Mo) were added to grey cast iron, and the effect of Ni, Mo on microstructure and mechanical properties were analysed in this study. When Ni was added alone, the precipitation of graphite was inhibited at the early stage of solidification, and part of graphite was formed between the dendrites, resulted in an uneven distribution of graphite. Ni played a role of solution strengthening and reduced the pearlite interlammer spacing, improved the mechanical properties. The addition of Mo refined the austenite dendrites and made the carbon unevenly distributed, which led to the abnormal growth of graphite. Mo increased the eutectoid supercooling degree, reduced the pearlite interlammer spacing and improved tensile strength. When Ni and Mo were added together, the elements beneficial to strength (Mo, Sn) were not uniformly distributed, and the influence on graphite size and pearlite interlammer spacing was not obvious, resulted in poor mechanical properties.","PeriodicalId":18270,"journal":{"name":"Materials Technology","volume":"19 6","pages":""},"PeriodicalIF":3.1,"publicationDate":"2023-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72485572","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}
ABSTRACT We elucidate here the temperature and strain rate sensitivity of a duplex stainless steel through the development of deformation maps and by studying the flow behaviour during hot compression tests in the temperature range of 1223–1473 K and at strain rates between 0.01 and 30 s−1. The flow curves exhibited softening after attaining a peak condition and the flow stress increased with the decrease of temperature and increase of strain rate. The observed change in the activation energy is attributed to strain partitioning between the two constituent phases and the deformation maps were characterised by two regions of flow instability. On the other hand, the microstructural evolution indicated that the strain rate and deformation temperature had a significant impact on the flow behaviour. In the flow stability region, the continuous dynamic recrystallisation (DRX) of ferrite was strongly activated, while in the flow instability region, both the continuous dynamic recrystallisation in ferrite and discontinuous DRX in austenite were weak.
{"title":"Strain rate and temperature sensitivity on the flow behaviour of a duplex stainless steel during hot deformation","authors":"Qiannan Li, Huixin Zuo, Jinfeng Feng, Ying Sun, Zhichao Li, Lian-fang He, Huiping Li","doi":"10.1080/10667857.2023.2166216","DOIUrl":"https://doi.org/10.1080/10667857.2023.2166216","url":null,"abstract":"ABSTRACT We elucidate here the temperature and strain rate sensitivity of a duplex stainless steel through the development of deformation maps and by studying the flow behaviour during hot compression tests in the temperature range of 1223–1473 K and at strain rates between 0.01 and 30 s−1. The flow curves exhibited softening after attaining a peak condition and the flow stress increased with the decrease of temperature and increase of strain rate. The observed change in the activation energy is attributed to strain partitioning between the two constituent phases and the deformation maps were characterised by two regions of flow instability. On the other hand, the microstructural evolution indicated that the strain rate and deformation temperature had a significant impact on the flow behaviour. In the flow stability region, the continuous dynamic recrystallisation (DRX) of ferrite was strongly activated, while in the flow instability region, both the continuous dynamic recrystallisation in ferrite and discontinuous DRX in austenite were weak.","PeriodicalId":18270,"journal":{"name":"Materials Technology","volume":"39 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2023-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72887900","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}
Pub Date : 2023-01-23DOI: 10.1080/10667857.2023.2165245
Chenglong Yang, Hong Xu, Yu Wang, Fei Li, H. Mao, Shiyuan Liu
ABSTRACT This paper proposes a casting improvement process to enable the casting of Al-Cu alloy cylinder heads to achieve the required quality. The hot tearing defects generated in the fire face of the cylinder head during casting were simulated using MAGMA software. The simulation results show that the large wall thickness transition difference in the fire face of the cylinder head is the reason for the large temperature and stress gradient during solidification. Therefore, the first solution was optimised by forming the fire face as a whole into a flat plate, but the fire face centre area stress is still too high. The second optimisation option optimises the cold iron structure of the fire face, the probability of cracking in the fire face is reduced to 17%. These results have important reference significance for the optimisation of the Al-Cu alloy cylinder head hot tearing problem.
{"title":"Hot Tearing analysis and process optimisation of the fire face of Al-Cu alloy cylinder head based on MAGMA numerical simulation","authors":"Chenglong Yang, Hong Xu, Yu Wang, Fei Li, H. Mao, Shiyuan Liu","doi":"10.1080/10667857.2023.2165245","DOIUrl":"https://doi.org/10.1080/10667857.2023.2165245","url":null,"abstract":"ABSTRACT This paper proposes a casting improvement process to enable the casting of Al-Cu alloy cylinder heads to achieve the required quality. The hot tearing defects generated in the fire face of the cylinder head during casting were simulated using MAGMA software. The simulation results show that the large wall thickness transition difference in the fire face of the cylinder head is the reason for the large temperature and stress gradient during solidification. Therefore, the first solution was optimised by forming the fire face as a whole into a flat plate, but the fire face centre area stress is still too high. The second optimisation option optimises the cold iron structure of the fire face, the probability of cracking in the fire face is reduced to 17%. These results have important reference significance for the optimisation of the Al-Cu alloy cylinder head hot tearing problem.","PeriodicalId":18270,"journal":{"name":"Materials Technology","volume":"25 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2023-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84513420","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}
Pub Date : 2023-01-22DOI: 10.1080/10667857.2023.2164978
Lei Guo, X. Su, L. Dai, Leilei Wang, Qiaofei Sun, Chaohai Fan, Yalei Wang, Xueda Li
ABSTRACT Strain ageing embrittlement behaviour of X80 self-shielded flux-cored arc welding (FCAW) girth weld metal at different strain ageing conditions (1% prestrain, and aged at 150°C/100°C for 1 –6 h, and 80°C for 1–30 days) was studied. Microstructure of FCAW girth weld generally consisted of coarse granular bainite and lath bainite. After strain ageing, toughness notably decreased, and higher ageing temperature or longer ageing induced lower toughness, until ageing is fully yielded. At initial stage of strain ageing, more dimples were found accompanying with cleavage facet. With the progress of strain ageing, the embrittlement was more obvious, while larger cleavage facet and less dimples were found. Meanwhile, the critical size for cleavage fracture initiation site became smaller. Martensite–austenite constituent (1–2 μm) was found to initiate cleavage fracture when partially strain aged, while submicron inclusions could initiate cleavage facet when fully strain aged.
{"title":"Strain ageing embrittlement behaviour of X80 self-shielded flux-cored girth weld metal","authors":"Lei Guo, X. Su, L. Dai, Leilei Wang, Qiaofei Sun, Chaohai Fan, Yalei Wang, Xueda Li","doi":"10.1080/10667857.2023.2164978","DOIUrl":"https://doi.org/10.1080/10667857.2023.2164978","url":null,"abstract":"ABSTRACT Strain ageing embrittlement behaviour of X80 self-shielded flux-cored arc welding (FCAW) girth weld metal at different strain ageing conditions (1% prestrain, and aged at 150°C/100°C for 1 –6 h, and 80°C for 1–30 days) was studied. Microstructure of FCAW girth weld generally consisted of coarse granular bainite and lath bainite. After strain ageing, toughness notably decreased, and higher ageing temperature or longer ageing induced lower toughness, until ageing is fully yielded. At initial stage of strain ageing, more dimples were found accompanying with cleavage facet. With the progress of strain ageing, the embrittlement was more obvious, while larger cleavage facet and less dimples were found. Meanwhile, the critical size for cleavage fracture initiation site became smaller. Martensite–austenite constituent (1–2 μm) was found to initiate cleavage fracture when partially strain aged, while submicron inclusions could initiate cleavage facet when fully strain aged.","PeriodicalId":18270,"journal":{"name":"Materials Technology","volume":"29 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2023-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90619029","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}
ABSTRACT In the advanced progress of the synthesis of metal nanoparticles, the use of a bio-mimicking approach has been extensively studied and recognised as a non-toxic method. The use of Ag-NPs synthesised from inorganic compounds using plant extracts as surfactants are quite novel. Therefore, this study was carried out by synthesising and characterising Ag-NPs using a composite leave and bark extract solution of Croton macrostachyus as a capping agent. A 1:3 composite solution exhibited small nanoparticles with a rod-like shape that were active against bacteria. In addition, Ag-NPs were observed from leaf and bark extracts of a 1:1 components, as well as sand mall NPs from leaf extract, showing that leaf extract solution contained more reducing biomolecules. Furthermore, we studied the antibacterial activity of the synthesised NPs following the disc diffusion method (by preparing gram-negative and gram-positive bacteria). Thus, the synthesised NPs were active on Streptococcus pyogen compared with Pseudomonas aeruginosa bacteria.
{"title":"Green synthesis and characterisation of silver nanoparticles from leaf and bark extract of Croton macrostachyus for antibacterial activity","authors":"Kindnew Demssie Dejen, Desalegn Yilma Kibret, Tadesu Hailu Mengesha, Eneyew Tilahun Bekele, Abebe Tedla, Temesgen Abera Bafa, Fikade Teketel Derib","doi":"10.1080/10667857.2022.2164647","DOIUrl":"https://doi.org/10.1080/10667857.2022.2164647","url":null,"abstract":"ABSTRACT In the advanced progress of the synthesis of metal nanoparticles, the use of a bio-mimicking approach has been extensively studied and recognised as a non-toxic method. The use of Ag-NPs synthesised from inorganic compounds using plant extracts as surfactants are quite novel. Therefore, this study was carried out by synthesising and characterising Ag-NPs using a composite leave and bark extract solution of Croton macrostachyus as a capping agent. A 1:3 composite solution exhibited small nanoparticles with a rod-like shape that were active against bacteria. In addition, Ag-NPs were observed from leaf and bark extracts of a 1:1 components, as well as sand mall NPs from leaf extract, showing that leaf extract solution contained more reducing biomolecules. Furthermore, we studied the antibacterial activity of the synthesised NPs following the disc diffusion method (by preparing gram-negative and gram-positive bacteria). Thus, the synthesised NPs were active on Streptococcus pyogen compared with Pseudomonas aeruginosa bacteria.","PeriodicalId":18270,"journal":{"name":"Materials Technology","volume":"13 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2023-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75759632","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}
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