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Sintering study of Ti6Al4V powders with different particle sizes and their mechanical properties

International Journal of Minerals,Metallurgy and Materials 2018年第12期25卷 1389-1401页

作者： JoséLuis Cabezas-Villa JoséLemus-Ruiz didier bouvard Omar Jiménez Héctor Javier Vergara-Hernández Luis Olmos University Michoacana of San Nicolás of Hidalgo IIMMMorelia 58060México University Grenoble Alpes CNRSSIMaPGrenoble 38000France University of Guadalajara Departamento de Ingeniería de ProyectosZapopan 45100México National Technological Institute of Mexico I.T.MoreliaMorelia 58120México University Michoacana of San Nicolás of Hidalgo INICITMorelia 58060México

Ti6Al4V powders with three different particle size distributions(0–20, 20–45, and 45–75 μm) were used to evaluate the effect of the particle size distribution on the solid-state sintering and their mechanical properties. The sintering kinetics was determined by dilatometry at temperatures from 900 to 1260°C. The mechanical properties of the sintered samples were evaluated by microhardness and compression tests. The sintering kinetics indicated that the predominant mechanism depends on the relative density irrespective of the particle size used. The mechanical properties of the sintered samples are adversely affected by increasing pore volume fraction. The elastic Young's modulus and yield stress follow a power law function of the relative density. The fracture behavior after compression is linked to the neck size developed during sintering, exhibiting two different mechanisms of failure: interparticle neck breaking and intergranular cracking in samples with relative densities below and above of 90%, respectively. The main conclusion is that relative density is responsible for the kinetics, mechanical properties, and failure behavior of Ti6 Al4 V powders.

关键词： Ti6Al4V powders dilatometry microhardness sintering kinetics compression failure behavior

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Impaired Executive Function in Everyday Life: A Predictor of OCD Relapse?

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Journal of Behavioral and Brain Science 2019年第3期9卷 90-107页

作者： Nathalie Fournet Ouafae Achachi Arnaud Roy Jérémy Besnard Céline Lancelot didier Le Gall Martine bouvard Université Grenoble Alpes Université Savoie Mont Blanc CNRS LPNC Grenoble France Laboratoryof Psychology des Pays de la Loire EA4638 Université Bretagne Loire—Université d’Angers Angers France Reference Center of Learning Disorders—Centre Référent des Troubles d’Apprentissage Centre de Compétence Nantais de Neurofibromatose H&#244 pital Femme-Enfant-Adolescent CHU de Nantes Nantes France

Objectives: In the present study, we set out to establish whether executive function in everyday life is impaired in obsessive-compulsive disorder patients, and if it is more impaired (or not) in patients who relapsed after cognitive behavioural therapy than in treatment-na?ve obsessive-compulsive disorder patients. Method: The Behavior Rating Inventory of Executive Function— Adult Version (BRIEF-A) was used to measure executive function in everyday life in three groups of 19 participants: treatment-na?ve obsessive-compulsive disorderpatients, obsessive-compulsive disorder patients having relapsed after CBT, and healthy controls. Results: The BRIEF-A results revealed an impairment in executive function in the treatment-na?ve and relapsed obsessive-compulsive disorder groups, relative to the healthy control group. There was no significant difference in executive function between the two groups of patients. Conclusions: These results show that impaired executive function is not associated with relapse in patients with obsessive-compulsive disorder having undergone cognitive behavioural therapy.

关键词： Obsessive Compulsive Disorder Relapse Executive Function Cognitive Behavioural Therapy

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