{"title":"Magnesium matrix composites as interesting HIDAMETS","authors":"R. Schaller, D. Mari, F. Chowdhury","doi":"10.4149/KM_2011_3_189","DOIUrl":null,"url":null,"abstract":"Metal matrix composites, made of Mg or Mg-2wt.%Si matrices reinforced with C or SiC long fibres, were processed by gas-pressure infiltration. Such composites are an advantageous solution for developing light metallic materials, which exhibit simultaneously good mechanical properties and a high damping capacity. For instance C/Mg-Si composites have a specific Young's modulus more than 4 times and a damping capacity 10-100 times higher than steels or aluminium alloys. The thermal behaviour of these materials was investigated by mechanical spectroscopy. Thermal stress relaxation at interfaces gives rise to transient damping, which is interpreted as being due to hysteretic dislocation motion. Hysteretic dislocation motion is also responsible for the mechanical loss background. As this mechanism is not thermally activated, high damping is maintained in a wide frequency and temperature range.","PeriodicalId":49937,"journal":{"name":"Kovove Materialy-Metallic Materials","volume":null,"pages":null},"PeriodicalIF":0.7000,"publicationDate":"2011-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Kovove Materialy-Metallic Materials","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.4149/KM_2011_3_189","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
Metal matrix composites, made of Mg or Mg-2wt.%Si matrices reinforced with C or SiC long fibres, were processed by gas-pressure infiltration. Such composites are an advantageous solution for developing light metallic materials, which exhibit simultaneously good mechanical properties and a high damping capacity. For instance C/Mg-Si composites have a specific Young's modulus more than 4 times and a damping capacity 10-100 times higher than steels or aluminium alloys. The thermal behaviour of these materials was investigated by mechanical spectroscopy. Thermal stress relaxation at interfaces gives rise to transient damping, which is interpreted as being due to hysteretic dislocation motion. Hysteretic dislocation motion is also responsible for the mechanical loss background. As this mechanism is not thermally activated, high damping is maintained in a wide frequency and temperature range.
期刊介绍:
Kovove Materialy - Metallic Materials is dedicated to publishing original theoretical and experimental papers concerned with structural, nanostructured, and functional metallic and selected non-metallic materials. Emphasis is placed on those aspects of the science of materials that address:
the relationship between the microstructure of materials and their properties, including mechanical, electrical, magnetic and chemical properties;
the relationship between the microstructure of materials and the thermodynamics, kinetics and mechanisms of processes;
the synthesis and processing of materials, with emphasis on microstructural mechanisms and control;
advances in the characterization of the microstructure and properties of materials with experiments and models which help in understanding the properties of materials.