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Improving tribological properties of CP-Ti by in-situ fabrication of Ti-WC surface composite using a pinless WC-Co stirring tool

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Journal of Central South University 2024年第10期31卷 3688-3702页

作者： Meisam ASHOURI Reza TAGHIABADI Mohammad EMAMI morteza saghafi yazdi Iman ANSARIAN Department of Metallurgy and Materials Science Imam Khomeini International UniversityQazvin ***Iran Department of Materials Science and Engineering University of BonabBonab ***Iran

A surface Ti-WC composite was fabricated on CP-Ti by surface friction stirring(SFS)using a pinless WC-Cotool at a processing window of 800−2500 r/min and 8−50 mm/*** 1600 r/min-50 mm/min,a defect-free compositelayer with an average hardness of~HV 1170 is *** hardness was increased by WC and TiN reinforcingparticles,dissolved Co atoms in Ti,and the formation of ultrafine *** particles were incorporated into the Tisubstrate owing to the intense frictional interaction/heating at the tool-plate interface(~1000℃),which led to strengthloss and wear of the *** Williamson-Hall analysis of the XRD peaks of the SFSed sample confirmed a significantlysmall crystallite size(~100 nm).Wear tests showed that the wear resistance of the composite structure was about 4.5times higher than that of the *** analysis revealed a significant reduction in average value and fluctuations ofthe friction coefficient.

关键词： surface friction stirring CP-Ti Ti-WC surface composite hardness wear

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Estimating zona pellucida hardness under microinjection to assess oocyte/embryo quality: Analytical and experimental studies

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Advances in Bioscience and Biotechnology 2013年第5期4卷 679-688页

作者： morteza Khalilian Mojtaba Rezazadeh Valojerdi Mehdi Navidbakhsh Mahmoud Chizari Poopak Eftekhari-yazdi Department of Anatomy Faculty of Medical sciences Tarbiat Modares University Tehran Iran Department of Embryology Reproductive Biomedicine Research Center Royan Institute for Reproductive Biomedicine Academic Center for Education Culture and Research (ACECR) Tehran Iran Mechanical Engineering Department Iran University of Science and Technology Tehran Iran School of Design and Engineering Brunel University West London London UK

The precise determination of zona pellucida (ZP) hardness is largely unknown due to the lack of appropriate measuring and modelling methods. In this study, we have used experimental and theoretical models to describe the mechanical behavior of a single oocyte cell to improve the assisted reproductive technology (ART) outcomes by assessing oocyte/embryo quality. This paper presents the development of: i) a microinjection model to estimate the force of ZP penetration, ii) a micropipette aspiration model to determine the corresponding hardness, and iii) an experimental procedure to generate the required data for these two models. Our results show that the estimated penetration force provides a performance target for the penetration process during intracytoplasmic sperm injection (ICSI), while the estimated corresponding hardness serves as an indicator of the extent of deformation sustained by the oocyte prior to penetration. Evaluation of these results shows that a routine assessment of ZP hardness under microinjection would allow for the identification of certain oocyte pools for which further manipulation is recommended in order to improve injection, hatching and finally ART outcomes.

关键词： Human Oocyte Human Embryo Intracytoplasmic Sperm Injection Zona Pellucida Hardness

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