The effect of Al on microstructure and properties of Cu-15Ni-8Sn during the agingHong, Songbai; Luo, Wei; Wang, Dongya; Luo, Yi; Li, Xuehua; Liu, Feng
doi: 10.1088/1742-6596/2892/1/012011pmid: N/A
In this paper, microstructure evlution, hardness and tensile properties of Cu-15Ni-8Sn-(0.5Al) alloys during aging at 500°C were investigated in detail. The results showed that the grain was refined and the elongation of alloy at solid solution was improved with the additon.of Al. The DO22 ordered phase was suppressed during aging in the Cu-15Ni-8Sn-0.5Al alloy, while the L12 ordered phase stability was significantly improved. Therefore, the L12 ordered phase was not consumed by the discontinuous precipitation (DP) reaction during the prolonged aging process, which effectively suppressed the development of DP and improved the resistance to over-aging of the alloy. However, Al also leads to a serious decrease in the plasticity of Cu-15Ni-8Sn alloys, which has no yield point during tensile process after aging for 1h.
Why Using Spiro Compounds as Interlayers Can Enhance the Performance of Perovskite Solar Cells?Li, Yang; Zhang, Lixin; Wang, Bingzhe; Li, Jingyun; Fu, Yajie
doi: 10.1088/1742-6596/2892/1/012015pmid: N/A
Lattice defects in perovskite solar cells (PSCs) impede charge carrier recombination, thus limiting power conversion efficiency (PCE) enhancements. Herein, spiro[fluorene-9,9 ‘ - xanthene]-based molecules S1 and S2 were introduced as interfacial materials, improving perovskite crystallization, reducing trap density, and decreasing defects. The integration of S2 as an interlayer increases the average PCE to 21.06% under maximum power point (MPP) tracking, significantly higher than control devices with enhanced photostability.
Analysis of Stamping Forming and Springback of Arc-shaped Corrugated DiaphragmWang, Yu; Zhang, Chunguang; Li, Shangqing; An, Lei; Wu, Ye
doi: 10.1088/1742-6596/2892/1/012004pmid: N/A
The arc-shaped corrugated diaphragm is the packaging component of pressure sensors, and the quality of diaphragms directly affects the performance of pressure sensors. Diaphragms are usually produced by blanking process. Common production defects include the severe warping and the insufficient forming height. In order to reduce production defects, this paper uses the flat punch and the corrugated punch as research objects to clarify the effect of production process and punch structure on diaphragm production quality. The results show that the production process causes the diaphragm to have a convex warping tendency, which is opposite to the warping tendency caused by corrugation. Moving the corrugation away from the center of the diaphragm and increasing the corrugation spacing can improve the diaphragm quality, while the effect of the corrugation height can be ignored.
The effect of asymmetric rolling on aluminum alloy 5XXX series with scandiumNikitina, M.A.; Pesin, A.M.; Tandon, P.; Pustovoytov, D.O.; Pesin, I.A.; Lokotunina, N.M.; Biryukova, O.D.
doi: 10.1088/1742-6596/2892/1/012008pmid: N/A
One of the directions of development of aluminum alloys is to increase strength characteristics without increasing density. Scandium is an effective additive for improving the strength characteristics of alloys with a high magnesium content. The main disadvantage of scandium-containing alloys is the high cost, the cost of ligature in Russia Al-2%Sc reaches $ 50 per kg. The high cost of semi-finished products is a deterrent to the use of aluminum-scandium alloys in various industries. In this paper, we consider the replacement of symmetric rolling with asymmetric rolling in the last passes of hot and cold rolling as one of the ways to reduce the cost in the production of semi-finished products. The research was carried out on an aluminum wrought non-heat-treatable alloy of the 5XXX series with scandium having the Russian marking 1545K. Rolled semi-finished products using symmetric rolling, as well as using asymmetric, were manufactured at the Zhilyaev Laboratory of the Nosov Magnitogorsk State Technical University using the unique laboratory industrial rolling mill 400. Asymmetric rolling is used for both hot and cold rolling. Asymmetric rolling made it possible to significantly reduce the force per pass, the pressure per pass became higher than when using standard technology. The obtained mechanical characteristics and the study of the micro-structure indicate a positive effect of asymmetric rolling. The use of this approach can significantly reduce costs in the manufacture of semi-finished products without reducing the quality of the resulting semi-finished products.
Crystal Grain Rotation during Tensile Test of Polycrystalline Pure Titanium Thin Sheet Based on Surface Height and Crystal OrientationTada, Naoya; Ohashi, Hiroaki; Uemori, Takeshi; Sakamoto, Junji
doi: 10.1088/1742-6596/2892/1/012002pmid: N/A
Thin sheets and wires of polycrystalline pure titanium are important materials for various devices used in electrical, mechanical, dental, and medical fields. Since pure titanium shows strong anisotropy in elastic and plastic deformation, and the individual grains comprising a polycrystalline body have different orientations and geometries, inhomogeneous deformation always occurs on the microscopic scale. This inhomogeneity is more significant in thin films than in bulk materials. It is therefore important to investigate the inhomogeneous deformation of pure titanium thin sheets to ensure the reliability of various titanium devices. In this study, thin-sheet specimens made of polycrystalline pure titanium were subjected to tensile testing. Inhomogeneous deformation was evaluated on the basis of two kinds of crystal grain rotations based on surface height and crystal orientation. The results under elastic and plastic tensile conditions were compared.
Peer Review Statementdoi: 10.1088/1742-6596/2892/1/011002pmid: N/A
All papers published in this volume have been reviewed through processes administered by the Editors. Reviews were conducted by expert referees to the professional and scientific standards expected of a proceedings journal published by IOP Publishing.• Type of peer review: Single Anonymous• Conference submission management system: Morressier• Number of submissions received: 34• Number of submissions sent for review: 34• Number of submissions accepted: 0• Acceptance Rate (Submissions Accepted / Submissions Received × 100): 100• Average number of reviews per paper: 0• Total number of reviewers involved: 56• Contact person for queries:Name: Summer WangEmail: [email protected]: Shanghai Spectrum Academy
On dynamic responses of gear transmission system during rough tooth surface wornMeng, Fanshan; Yi, Wenhao; Zhang, Xin; Wang, Jiaxu
doi: 10.1088/1742-6596/2892/1/012017pmid: N/A
This study investigates the dynamic responses of gear systems while considering the morphology of worn gear tooth surfaces after different working times. Specifically, the anisotropic three-dimensional micro-morphology of the rough tooth surface model is established based on the W-B fractal theory. The non-uniform wear of the rough tooth surface under different rotational speeds and working hours is quantified according to Archard’s theory. The time-varying meshing stiffness (TVMS) and backlash are calculated with the wear values and then serve as internal excitation input parameters of the dynamic model. The dynamic responses are solved with the variable step Runge-Kutta algorithm. The results show that with increasing gear rotational speed and durations, the depth of tooth surface wear increases gradually, leading to a decrease in TVMS and an increase in backlash. The gear transmission system, considering the micro-morphology of the tooth surface, exhibits diverse dynamic response characteristics as speeds vary. With prolonged working hours, the system’s dynamic response transitions from periodic motion to chaotic motion, manifesting as chaotic vibrations, which are detrimental to steady operation. Transmission systems in chaotic motion can be transformed into stable periodic motion by adjusting the torque or rotational speed of the gears. The findings can provide theoretical guidance for selecting suitable operating conditions for gears subject to different wear degrees.
Prefacedoi: 10.1088/1742-6596/2892/1/011001pmid: N/A
The 7th International Conference on Mechanical Engineering and Applied Composite Materials (MEACM 2024) was held from September 23-25, 2024, in Singapore. We are pleased to report that the event ran exceptionally smoothly, with safety protocols strictly followed, and a productive, enjoyable, and stimulating meeting was held.MEACM is an annual international conference dedicated to discussing the latest advancements in mechanical engineering and applied composite materials. The organizing committee aimed to make MEACM 2024 an excellent platform for all attendees to gain new insights through discussions and the exchange of information on these topics.This year, we received an overwhelming response from the scientific community, with a total of 81 paper submissions. Each submission underwent a rigorous peer-review process to ensure that only the highest quality research was selected. After careful evaluation by our esteemed review panel, 21 papers were accepted for presentation at the conference.List of Committee Members are available in this Pdf.