Effects of treatments on the properties of polyester based hemp composite

The aim of present study is to enhance the properties of polyester based hemp composites by using different treatments.The effect of different treatments, such as alkali and benzoylation (chemical treatments), and sodium bicarbonate(ecofriendly treatment), on water absorption, and mechanical & dynamic mechanical properties of hemp/polyestercomposites has been studied. The composites are prepared by hand lay-up technique using constant (15 wt. %) fibrescontent. Water absorption properties are investigated in terms of maximum water uptake, and sorption, diffusion &permeability coefficients. Dynamic mechanical properties, such as storage modulus E', glass transition temperature g T & damping Tan , and mechanical properties such as tensile strength & modulus, flexural strength & modulus,and impact strength are also investigated. The results suggest a significant effect of chemical treatment in terms of increasein mechanical and dynamic mechanical properties, and decrease in water absorption properties. The benzoylation treatmentshows the better impact among all three chemical treatments

Effect of Ti reinforcement on the physical and mechanical properties of AZ91/Ti composites

602-607Magnesium-metal matrix composites reinforced with ceramic materials (TiO2, SiC, B4C, Al2O3) have better mechanical strength as compared to pure magnesium but their ductility is very low. On the other hand, the Mg-based composites reinforced with carbonaceous (carbon nanotubes, graphite, graphene, etc.) reinforcements have better wear resistance; however, there are chances of agglomeration of reinforcement. To overcome the limitations mentioned above; the Mg based composites reinforced with metallic reinforcements (Ti) have prepared in the present work. The physical and mechanical properties of prepared Mg/Ti composites have diagnosed experimentally. The density (green and sintered), hardness, compressive stress, and ductility have increased with the addition of Ti to the Mg matrix. Reason for increase in the density and other mechanical properties after the addition of Ti to the Mg matrix is the increased compressibility, reduced porosity and proper mechanical bonding of Mg-Ti. The maximum hardness (47.5 BHN) and ultimate compressive strength (187 MPa) has obtained for Mg + 6% Ti composite

Effect of Ti reinforcement on the physical and mechanical properties of AZ91/Ti composites

Magnesium-metal matrix composites reinforced with ceramic materials (TiO2, SiC, B4C, Al2O3) have better mechanical strength as compared to pure magnesium but their ductility is very low. On the other hand, the Mg-based composites reinforced with carbonaceous (carbon nanotubes, graphite, graphene, etc.) reinforcements have better wear resistance; however, there are chances of agglomeration of reinforcement. To overcome the limitations mentioned above; the Mg based composites reinforced with metallic reinforcements (Ti) have prepared in the present work. The physical and mechanical properties of prepared Mg/Ti composites have diagnosed experimentally. The density (green and sintered), hardness, compressive stress, and ductility have increased with the addition of Ti to the Mg matrix. Reason for increase in the density and other mechanical properties after the addition of Ti to the Mg matrix is the increased compressibility, reduced porosity and proper mechanical bonding of Mg-Ti. The maximum hardness (47.5 BHN) and ultimate compressive strength (187 MPa) has obtained for Mg + 6% Ti composite

Effects of treatments on the properties of polyester based hemp composite

313-319The aim of present study is to enhance the properties of polyester based hemp composites by using different treatments. The effect of different treatments, such as alkali and benzoylation (chemical treatments), and sodium bicarbonate (ecofriendly treatment), on water absorption, and mechanical & dynamic mechanical properties of hemp/polyester composites has been studied. The composites are prepared by hand lay-up technique using constant (15 wt. %) fibres content. Water absorption properties are investigated in terms of maximum water uptake, and sorption, diffusion & permeability coefficients. Dynamic mechanical properties, such as storage modulus (E'), glass transition temperature (Tg) & damping (Tanδ), and mechanical properties such as tensile strength & modulus, flexural strength & modulus and impact strength are also investigated. The results suggest a significant effect of chemical treatment in terms of increase in mechanical and dynamic mechanical properties, and decrease in water absorption properties. The benzoylation treatment shows the better impact among all three chemical treatments

Influence of ECAP processing temperature and number of passes on hardness and microstructure of Al-6063

Equal-channel angular pressing (ECAP) is one the most efficient techniques of severe plastic deformation for grain refinement and improving mechanical properties. In this study, aluminium alloy 6063 is used due to its wide range of applications. The ECAP process depends on die geometry, number of passes, processing temperature, following routes, plunger speed, strain and frictions. In this study, cylindrical billets of Al-6063 are processed at two different temperatures, at room temperature and at elevated temperature (250°C) through route BC. In the present research, specimens deformed after first pass, third pass and the sixth pass are considered for analysing the microstructure evolution and hardness values. Optical microscopy and electron back scattered diffraction (EBSD) techniques are used for microstructural study. Hardness test is carried out for hardness measurement with test load 100 g. The hardness is increased up to 85 HV after six passes at room temperature. Hardness increases up to 83% only after one pass at room temperature. EBSD result shows the low-angle grain boundaries are 91.06% where high-angle grain boundaries are only 8.9% of sample with one pass at 250°C. The elevated processing temperature influences both hardness and microstructure. © 2021 Informa UK Limited, trading as Taylor & Francis Group