Superplasticity in Advanced Materials最新文献_第3页

Hot plastic behavior of an ultrafine-grained aluminum alloy fabricated by laser powder bed fusion and equal channel angular pressing 激光粉末床熔合等通道角压成形超细晶铝合金的热塑性行为

Superplasticity in Advanced Materials Pub Date : 2023-07-10 DOI: 10.21741/9781644902615-38

J. A. Muñoz, Louis Huvelle, Enrique Manuel Huerta, José María Cabrera

{"title":"Hot plastic behavior of an ultrafine-grained aluminum alloy fabricated by laser powder bed fusion and equal channel angular pressing","authors":"J. A. Muñoz, Louis Huvelle, Enrique Manuel Huerta, José María Cabrera","doi":"10.21741/9781644902615-38","DOIUrl":"https://doi.org/10.21741/9781644902615-38","url":null,"abstract":"Abstract. This research presents the microstructural evolution and mechanical properties of a hypoeutectic AlSi11Cu alloy obtained through laser powder bed fusion (L-PBF) and subsequent severe plastic deformation. The as-built alloy demonstrated a structure formed by an Al matrix surrounded by a Si-enriched cellular network. Tensile tests indicated a yield strength of 350 MPa and elongation to fracture lower than 5% for the as-built material. After subjecting the alloy to severe plastic deformation (SPD) using equal channel angular pressing (ECAP), superior mechanical properties such as an elongation almost twice as high as the as-built condition (12% compared to 6%) and a high tensile yield strength (320 MPa) were observed. ECAP produced average grain size reduction from 10 µm in the as-built state to 1 µm after six ECAP passes. Microstructural analyses highlight in particular the grain refinement of the microstructure after the ECAP process, changing from a microstructure composed of columnar grains to a heterogeneous microstructure characterized by ultra-fine (grain sizes between 200 nm - 500 nm) and elongated grains (grains between 5 µm – 10 µm). This finding supposes a huge improvement for the mechanical performance of this alloy breaking the strength-ductility paradox. The superplastic properties of the materials were characterized, depending on the variation of the temperature and strain rate parameters. This showed that the superplastic behavior was favored by low strain rates (here 0.001 s−1), and by increasing temperature (400 °C). Thus, elongations exceeding 70% were achieved with ECAP material.","PeriodicalId":242571,"journal":{"name":"Superplasticity in Advanced Materials","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129791905","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}

引用次数: 1

Effect of Co addition on the microstructure evolution and superplastic behavior of Ti-4Al-3Mo-1V-0.1B alloy Co添加对Ti-4Al-3Mo-1V-0.1B合金组织演变及超塑性行为的影响

Superplasticity in Advanced Materials Pub Date : 2023-07-10 DOI: 10.21741/9781644902615-20

A. Kotov, Maria N. Postnikova, Ahmed O. Mosleh, A. Mikhaylovskaya

{"title":"Effect of Co addition on the microstructure evolution and superplastic behavior of Ti-4Al-3Mo-1V-0.1B alloy","authors":"A. Kotov, Maria N. Postnikova, Ahmed O. Mosleh, A. Mikhaylovskaya","doi":"10.21741/9781644902615-20","DOIUrl":"https://doi.org/10.21741/9781644902615-20","url":null,"abstract":"Abstract. Temperature reduction of superplastic forming of titanium alloys is currently a significant issue. The present study focused on the effect of modifying the Ti-4Al-3Mo-1V-0.1B alloy with 0.5-2 wt% Co additions on the superplastic behavior and microstructure evolution. The results demonstrated that Co alloying promoted the formation of recrystallized and globular microstructure before the beginning of superplastic deformation due to the acceleration of diffusivity by Co in comparison with the Co-free alloy. The diffusivity acceleration also led to dynamic grain growth during superplastic deformation but promoted a stable superplastic flow of alloys with 0.5-2% Co at temperatures of 700-750 °C. This enhanced the strain rate sensitivity coefficient m from 0.35-0.4 to 0.5-0.65 and the elongation to failure from 200-350% to 500-1000% compared to the Co-free alloy. The 2 wt% Co alloying provided excellent low-temperature superplasticity in the temperature range of 625-775 °C with a coefficient m of 0.5-0.65 and elongation to failure of 800-1000% at a constant strain rate of 1 × 10-3 s-1.","PeriodicalId":242571,"journal":{"name":"Superplasticity in Advanced Materials","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121674607","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}

引用次数: 0

Study on superplastic gas-bulging properties and microstructure evolution of as-rolled 2A97 Al-Li alloy 2A97铝锂合金轧制态超塑性气体胀形性能及组织演变研究

Superplasticity in Advanced Materials Pub Date : 2023-07-10 DOI: 10.21741/9781644902615-16

Yanling Zhang, Jiajia Liu, Huiyuan Xu, Du Lihua

{"title":"Study on superplastic gas-bulging properties and microstructure evolution of as-rolled 2A97 Al-Li alloy","authors":"Yanling Zhang, Jiajia Liu, Huiyuan Xu, Du Lihua","doi":"10.21741/9781644902615-16","DOIUrl":"https://doi.org/10.21741/9781644902615-16","url":null,"abstract":"Abstract. In this paper, the forming properties of as-rolled 2A97 Al-Li alloy at 370 ~430 ℃ and 0.02~0.08 MPa/min were studied by Superplastic gas-bulging experiment, the microstructure and mechanical properties of 2A97 Al-Li alloy after deformation were evaluated and analysed by means of EBSD, TEM and other testing methods. The results show that the as-rolled 2A97 Al-Li alloy has good superplastic deformation ability, the optimum forming parameters are 390℃, 0.06 MPa/min, and the maximum height of cap cone is 74 mm under these conditions. Dynamic recry -stallization of rolled microstructure occurs during superplastic deformation, the microstructure after superplastic deformation is fine, equiaxed and the average grain size is less than 5 μm. The material keeps good strength and plasticity after superplastic deformation, the tensile fracture shows obvious ductile fracture characteristics, and there are a lot of dimples with regular shape and uniform distribution on the fracture surface. After superplastic forming, it undergoes 520 ℃/2h solution treatment, water quenching, and aging at 165 ℃/36h, the properties of 2A97 Al- Li were as follows: tensile strength 527MPa, yield strength 441MPa, and elongation 8.3%, respectively.","PeriodicalId":242571,"journal":{"name":"Superplasticity in Advanced Materials","volume":"2001 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125745907","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}

引用次数: 0

Experimental study of the effect of increasing technological plasticity during asymmetric rolling of aluminum alloys 提高铝合金非对称轧制工艺塑性效果的实验研究

Superplasticity in Advanced Materials Pub Date : 2023-07-10 DOI: 10.21741/9781644902615-36

Anna Kozhemyakina, A. Pesin, D. Pustovoytov, Leonid Nosov, Anna Baryshnikova, Natalia Lokotunina, Dmitry Grachev

{"title":"Experimental study of the effect of increasing technological plasticity during asymmetric rolling of aluminum alloys","authors":"Anna Kozhemyakina, A. Pesin, D. Pustovoytov, Leonid Nosov, Anna Baryshnikova, Natalia Lokotunina, Dmitry Grachev","doi":"10.21741/9781644902615-36","DOIUrl":"https://doi.org/10.21741/9781644902615-36","url":null,"abstract":"Abstract. In this paper the effect of asymmetric rolling on the possibility of increasing the technological plasticity of aluminum alloys was investigated. The experimental research was carried out on a laboratory asymmetric rolling mill with an individual drive of the work rolls with the possibility of creating a speed ratio from 1.0 to 5.0. It was shown that the increase of speed ratio of the work rolls from 1.0 to 5.0 significantly reduce the rolling force in comparison with symmetric rolling. Rolling force decreased in 1.9 times for alloy AD33 (AA6061), in 2.3 times for alloy AMg6, in 3.2 times for alloy D16 (AA2024). At the same time the technological plasticity was increased. Technological plasticity characterizes the ability of a material to undergo higher thickness reductions without fracture under certain conditions of stress, temperature, and strain rate. In asymmetric rolling the thickness reduction was increased from 48 to 87% for alloy D16, from 50 to 59% for alloy AMg6, and from 40 to 75% for alloy AD33 in comparison with symmetric rolling. In all cases the samples had initially room temperature and were subjected only to deformation heating and friction heating. Extremely high thickness reduction (87%) was achieved by a single pass asymmetric rolling (at speed ratio 5.0) for alloy D16. It was found that the ductility of the alloy D16 was 12.3% after asymmetric rolling with a thickness reduction of 87% and without the use of annealing. This was approximately 2 times higher than the initial ductility (6.2%) of the same alloy in the initial annealed state and much higher than ductility (0.3%) after symmetric rolling. New technological schemes of sheet rolling of aluminum alloys with high ductility and increased technological plasticity have been developed.","PeriodicalId":242571,"journal":{"name":"Superplasticity in Advanced Materials","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127482531","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}

引用次数: 0

Effects of deformation conditions on the superplastic deformation behavior of LZ91 Mg-Li alloy under electric field 变形条件对电场作用下LZ91 Mg-Li合金超塑性变形行为的影响

Superplasticity in Advanced Materials Pub Date : 2023-07-10 DOI: 10.21741/9781644902615-12

Bao Meng, Feng Pan, Jianqiang Yang, Dongsheng Li, M. Wan

{"title":"Effects of deformation conditions on the superplastic deformation behavior of LZ91 Mg-Li alloy under electric field","authors":"Bao Meng, Feng Pan, Jianqiang Yang, Dongsheng Li, M. Wan","doi":"10.21741/9781644902615-12","DOIUrl":"https://doi.org/10.21741/9781644902615-12","url":null,"abstract":"Abstract. The electro-superplastic effect (ESP effect) can enhance the superplastic deformation ability of alloy, and can also make alloy with poor plasticity have superplastic properties. Diverse grain sizes of LZ91 Mg-Li alloy were successfully prepared through equal channel angular pressing (ECAP) process. In order to explore the superplastic deformation behavior of LZ91 Mg-Li alloy under the electric current, an electric field assisted superplastic uniaxial tensile test platform was designed and fabricated. A decreasing constant voltage electrification scheme was proposed, and the experiments under different current densities, initial strain rates and grain sizes were carried out. The results indicate that the true strain-stress curve of LZ91 Mg-Li alloy gradually comes to steady with the increase of current density, presenting a steady-state rheological characteristic. The initial strain rate has a significant effect on the superplastic deformation behavior of LZ91 Mg-Li alloy under high voltage condition. For the fine-grained LZ91 Mg-Li alloy, the electric field can effectively reduce the superplastic deformation temperature and considerably enhance the elongation. This paper enriches the understanding of the superplastic deformation behavior of LZ91 Mg-Li alloy under the action of electric field.","PeriodicalId":242571,"journal":{"name":"Superplasticity in Advanced Materials","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121659597","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}

引用次数: 1

Achieving superplasticity in hard-to-deform metallic materials using high-pressure sliding (HPS) process 利用高压滑动(HPS)工艺实现难变形金属材料的超塑性

Superplasticity in Advanced Materials Pub Date : 2023-07-10 DOI: 10.21741/9781644902615-2

Z. Horita, Y. Takizawa

引用次数: 0

Superplastic forming process research of front aluminum alloy opening and closing mechanism hatch for multiple units 前部铝合金多单元启闭机构舱口超塑性成形工艺研究

Superplasticity in Advanced Materials Pub Date : 2023-07-10 DOI: 10.21741/9781644902615-17

Ranran Chen, Guangzhong He, Kefei Wang, Guofeng Wang

{"title":"Superplastic forming process research of front aluminum alloy opening and closing mechanism hatch for multiple units","authors":"Ranran Chen, Guangzhong He, Kefei Wang, Guofeng Wang","doi":"10.21741/9781644902615-17","DOIUrl":"https://doi.org/10.21741/9781644902615-17","url":null,"abstract":"Abstract. In this paper, the forming process research of the front opening and closing mechanism hatch for multiple units was carried out, and the industrial grade 5083 aluminum alloy was selected as the original material. The uniform rapid superplastic forming process combined with hot stamping and direct-reverse superplastic forming was used to form the hatch body skin, the cold stamping and argon arc welding process were used to produce the connection support, and the hatch integral part was obtained by argon arc welding finally, which solved the problem of poor environmental protection and high ratio of traditional FRP hatch and high precision forming of the large complex thin-walled structural part that cannot be achieved by the traditional forming process. After process research and development, finite element analysis, and forming tests, the aluminum alloy hatch with good forming quality was successfully manufactured. The ultimate thinning rate of the part was 23.8%, the overall wall thickness was evenly distributed, the deviation of shape was controlled within 1 mm, and the mechanical properties met the relevant technical requirements.","PeriodicalId":242571,"journal":{"name":"Superplasticity in Advanced Materials","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130295602","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}

引用次数: 0

Integration of HF and SPF technology in an efficient industrial production flow for high rates aeronautical parts 将高频和SPF技术集成到高速航空部件的高效工业生产流程中

Superplasticity in Advanced Materials Pub Date : 2023-07-10 DOI: 10.21741/9781644902615-13

Yves Marcel, Jeremy Pion, Sharan Raj, Rangasamy Mahendren

引用次数: 0

In-situ heating observations on microstructure relaxation of ultrafine-grained high-entropy alloys using neutron diffraction and laser-scanning confocal microscopy 用中子衍射和激光扫描共聚焦显微镜观察超细晶高熵合金的显微组织弛豫

Superplasticity in Advanced Materials Pub Date : 2023-07-10 DOI: 10.21741/9781644902615-27

Megumi Kawasaki, Jae-Kyung Han, Suk-Chun Moon, K. Liss

{"title":"In-situ heating observations on microstructure relaxation of ultrafine-grained high-entropy alloys using neutron diffraction and laser-scanning confocal microscopy","authors":"Megumi Kawasaki, Jae-Kyung Han, Suk-Chun Moon, K. Liss","doi":"10.21741/9781644902615-27","DOIUrl":"https://doi.org/10.21741/9781644902615-27","url":null,"abstract":"Abstract. The thermal stability of ultrafine-grained metals can be fully understood when observing time-resolved microstructural changes over multiple-length scales. The global microstructural relaxation behavior upon heating of an ultrafine-grained (UFG) CoCrFeNi high-entropy alloy (HEA) was characterized by in-situ heating neutron diffraction measurements. Before heating, the nanocrystalline microstructure was introduced by applying high-pressure torsion (HPT), leading to severe lattice distortion by excess dislocations and defects. The sequential information on the structural relaxation of recovery, recrystallization, and grain growth are identified by in-situ heating neutron diffraction analysis defining the texture development, linear thermal lattice expansion, and stress relaxation behaviors of the UFG HEA with increasing temperature up to 1300K. By contrast, nanocrystalline metals processed by HPT are often inhomogeneous microstructurally and compositionally. The influence of such inhomogeneity on the macro-scale microstructural relaxation is monitored using an HPT-processed CoCrFeNiMn high-entropy alloy through in-situ heating laser-scanning confocal microscopy. This study emphasizes the importance of characterization techniques for further in-depth exploration of the SPD-processed ultrafine-grained structure.","PeriodicalId":242571,"journal":{"name":"Superplasticity in Advanced Materials","volume":"25 10","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114058093","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}

引用次数: 1

An investigation of forming of Ti-6Al-4V at lower temperatures Ti-6Al-4V低温成形的研究

Superplasticity in Advanced Materials Pub Date : 2023-07-10 DOI: 10.21741/9781644902615-5

Hosam Elrakayby, Diego Gonzalez, P. Mandal, Paul Blackwell

{"title":"An investigation of forming of Ti-6Al-4V at lower temperatures","authors":"Hosam Elrakayby, Diego Gonzalez, P. Mandal, Paul Blackwell","doi":"10.21741/9781644902615-5","DOIUrl":"https://doi.org/10.21741/9781644902615-5","url":null,"abstract":"Abstract. Forming components of titanium alloys via superplastic forming at elevated temperatures while being exposed to oxygen leads to surface oxidation. The hard oxide layer formed on the surface of components is referred to as the alpha case. This alpha case layer requires post-form processing to remove it, thus increasing overall manufacturing costs and times. Superplastic forming at lower temperatures can significantly reduce the formation of the alpha case and has other benefits, such as life extension of tooling and less energy consumption. This paper shows the work done in terms of forming non-commercial components at temperatures significantly lower than the traditional ones, proving that forming at those temperatures is readily achievable. Forming pressures and tonnage need to be readjusted because of the increase in the flow stresses of the material. This paper also illustrates the implementation of a microstructural-based model to predict the hot forming behaviour of commercial titanium alloy Ti-6Al-4V (Ti64) during forming at 800°C. The material model is implemented into a commercial finite element software, Abaqus, and PAM-STAMP to obtain the optimal pressure cycle to form a non-commercial research component at 800 °C with a view to minimizing alpha case formation.","PeriodicalId":242571,"journal":{"name":"Superplasticity in Advanced Materials","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128566580","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}

引用次数: 0