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Elaboration of AlSi10Mg casting alloys using directional solidification processing 被引量:1
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作者 Khadoudja Ghedjati Eric Fleury +3 位作者 Mohamed Seghir Hamani Mostefa Benchiheub Khaider Bouacha Bernard Bolle 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2015年第5期509-515,共7页
The effects of pulling velocity on the solidification behavior and microstructural parameters of A1Sil0Mg alloys prepared in a Bridgman-type directional solidification furnace were investigated. The microstructure, pa... The effects of pulling velocity on the solidification behavior and microstructural parameters of A1Sil0Mg alloys prepared in a Bridgman-type directional solidification furnace were investigated. The microstructure, particularly the secondary dendritic arm spacing (SDAS), and the Brinell hardness (BH) of the solidified A1Sil0Mg alloys were characterized for samples with cylindrical shapes and differ- ent conicities (θ = 0°, 5°, and 10°). Microstructural studies revealed an increased density of ct-A1 phase dendrites and a decreased interden- dritic distance with increasing pulling velocity. The dendrites were found to be preferentially oriented along the pulling direction for low pulling velocities. For larger pulling velocities, the dendrites grew first in the cooling direction but then broke as others nucleated and coars- ened. The HB values of the solidified samples increased as the pulling velocity increased. In regard to sample conicity, smaller dendrites were observed for an apex angle of θ = 5°, resulting in the largest HB value. This result was interpreted in terms of the favorable orientation of the dendrite along the pulling direction. 展开更多
关键词 aluminum-silicon-magnesium alloys directional solidification Bridgman technique mierostructure HARDNESS heat flow growth
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Mechanical properties and friction behaviors of CNT/AlSi_(10)Mg composites produced by spark plasma sintering 被引量:1
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作者 Lin-zhi Wang Ying Liu +1 位作者 Jiao-jiao Wu Xi Zhang 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2017年第5期584-593,共10页
The mechanical properties and friction behaviors of CNT/AlSi10Mg composites produced by spark plasma sintering (SPS) were investigated. The results showed that the densities of the sintered composites gradually increa... The mechanical properties and friction behaviors of CNT/AlSi10Mg composites produced by spark plasma sintering (SPS) were investigated. The results showed that the densities of the sintered composites gradually increased with increasing sintering temperature and that the highest microhardness and compressive strength were achieved in the specimen sintered at 450A degrees C. CNTs dispersed uniformly in the Al-Si10Mg matrix when the addition of CNTs was less than 1.5wt%. However, when the addition of CNTs exceeded 1.5wt%, the aggregation of CNTs was clearly observed. Moreover, the mechanical properties (including the densities, compressive strength, and microhardness) of the composites changed with CNT content and reached a maximum value when the CNT content was 1.5wt%. Meanwhile, the minimum average friction coefficient and wear rate of the CNT/AlSi10Mg composites were obtained with 1.0wt% CNTs. 展开更多
关键词 metal matrix composites carbon nanotubes (CNTs) aluminum silicon magnesium alloys spark plasma sintering mechanical properties friction
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