scholarly journals Study of age hardening process on Al/SiC/Al2O3 hybrid composite

2020 ◽  
Vol 912 ◽  
pp. 052025
Author(s):  
Kolli Balasivarama Reddy ◽  
Chiguluri Shaivinay ◽  
T Jeevan Naidu ◽  
Shri Lekhaz ◽  
Nived Akula
Keyword(s):  
Hybrid Composite ◽  
Age Hardening ◽  
Hardening Process

Metallography & Bulk Hardness of Artificially Aged Al6061-B4C-SiC Stir Cast Hybrid Composites

2016 ◽  
Vol 880 ◽  
pp. 140-143
Author(s):  
Sathya Shankar Sharma ◽  
K. Jagannath ◽  
P.R. Prabhu ◽  
Shankar M.C. Gowri ◽  
S.R. Harisha ◽  
...  
Keyword(s):  
Hybrid Composite ◽  
Hybrid Composites ◽  
Intermetallic Phase ◽  
Aging Treatment ◽  
Casting Process ◽  
Stir Casting ◽  
Nucleation Site ◽  
Age Hardening ◽  
Bulk Hardness ◽  
Al6061 Alloy

Present investigation focusses on combined effect of B4C and SiC on the improvement in hardness with an average size of 35-40μm on Al6061 hybrid composite. Composites are produced by stir casting process. The effect of artificial aging treatment with different aging temperatures of 100, 150 and 200OC on the improvement in hardness is also investigated. Optical micrographs and Brinell hardness number have been discussed. An attempt is made to find out the intermetallic phase responsible for strengthening by Transmission Electron Microscopy. Due to positive response to age hardening treatment there is an improvement in the mechanical properties of Al6061 alloy & its hybrid composite. The aging kinetics is more accelerated in case of hybrid composites as compared to unreinforced Al6061 alloy because of presence of reinforcement particulate, which act as nucleation site for precipitation. Artificially aged at 100OC shows improvement in hardness by 120-220% due to the precipitation of secondary solute rich phase of alloying elements as compared Al6061 alloy.

scholarly journals Age Hardening of Snow at the South Pole

1963 ◽  
Vol 4 (35) ◽  
pp. 521-536 ◽  
Author(s):  
Anthony J. Gow ◽  
René O. Ramseier
Keyword(s):  
Particle Size ◽  
Compressive Strength ◽  
Solar Radiation ◽  
Thin Section ◽  
Low Temperatures ◽  
Age Hardening ◽  
South Pole ◽  
The South ◽  
Hardening Process ◽  
Snow Particle

The age hardening of artificially and naturally compacted snow has been investigated at the South Pole. Results show that the age-hardening process is greatly retarded at low temperatures. Artificially compacted samples of density 0.55 g./cm.3 attained a compressive strength of less than 3.0 kg./cm.2 after one year’s ageing at −49° C. Exposure to solar radiation accelerated the age hardening. Irradiated samples attained a strength of 6.0 kg./cm.2 after 100 hr., increasing to a virtual maximum of 8.0 kg./cm.2 at the end of 600 hr. Compressive strengths increased with decrease in snow-particle size and with increasing angularity of the particles. Below 3 m. the strength of naturally compacted snow was found to increase rapidly with increase in density. Naturally compacted snow of density 0.55 g./cm.3 possessed considerably greater strength than any of the age-hardened samples of artificially compacted snow of the same density. Thin-section studies show that age hardening can be correlated with the formation and growth of intergranular bonds, and that bond growth falls off rapidly with decreasing temperature. In view of the low strengths found in both naturally compacted snows near the surface and in artificially compacted snow at the South Pole, “cut-and-cover” under-snow camp construction may not prove too practical at the South Pole.

scholarly journals Age-hardening process of Al-Mg-Si alloys.

1993 ◽  
Vol 43 (3) ◽  
pp. 146-151 ◽  
Author(s):  
Masahiro YANAGAWA ◽  
Shojiro OIE ◽  
Mutsumi ABE
Keyword(s):  
Age Hardening ◽  
Hardening Process

scholarly journals Age Hardening of Snow at the South Pole

1963 ◽  
Vol 4 (35) ◽  
pp. 521-536 ◽  
Author(s):  
Anthony J. Gow ◽  
René O. Ramseier
Keyword(s):  
Particle Size ◽  
Compressive Strength ◽  
Solar Radiation ◽  
Thin Section ◽  
Low Temperatures ◽  
Age Hardening ◽  
South Pole ◽  
The South ◽  
Hardening Process ◽  
Snow Particle

The age hardening of artificially and naturally compacted snow has been investigated at the South Pole. Results show that the age-hardening process is greatly retarded at low temperatures. Artificially compacted samples of density 0.55 g./cm.3 attained a compressive strength of less than 3.0 kg./cm.2 after one year’s ageing at −49° C. Exposure to solar radiation accelerated the age hardening. Irradiated samples attained a strength of 6.0 kg./cm.2 after 100 hr., increasing to a virtual maximum of 8.0 kg./cm.2 at the end of 600 hr. Compressive strengths increased with decrease in snow-particle size and with increasing angularity of the particles. Below 3 m. the strength of naturally compacted snow was found to increase rapidly with increase in density. Naturally compacted snow of density 0.55 g./cm.3 possessed considerably greater strength than any of the age-hardened samples of artificially compacted snow of the same density. Thin-section studies show that age hardening can be correlated with the formation and growth of intergranular bonds, and that bond growth falls off rapidly with decreasing temperature. In view of the low strengths found in both naturally compacted snows near the surface and in artificially compacted snow at the South Pole, “cut-and-cover” under-snow camp construction may not prove too practical at the South Pole.

scholarly journals Optimization of Age Hardening Behaviour of AA2024 Hybrid Composite Reinforced with Red Mud and Fly Ash through RSM

2019 ◽  
Vol 9 (1) ◽  
pp. 762-770
Keyword(s):  
Process Parameters ◽  
Red Mud ◽  
Hybrid Composite ◽  
Ageing Time ◽  
Ageing Temperature ◽  
Age Hardening ◽  
Artificial Ageing ◽  
Weight Percentage ◽  
Morphological Studies ◽  
The Impact

Hybrid AA2024 Metal Matrix composite find explicit application, so important factors like Hardness, lightweight is considered and hybrid composite was synthesized by stir casting route. In this investigation, the effects of age hardening on Hardness of AA2024 reinforced with industrial wastes is measured by using a Vickers hardness test and the influence of different process parameters are studied using Design Expert. A Response Surface Methodology is an effective technique used to observe the impact of age hardening parameters and their interconnection on surface hardness of the prepared hybrid AA2024 composite. A mathematical model was created to optimize the weight percentage of reinforcement and artificial ageing process parameters for maximum Hardness. Adequacy and lack of fit of the developed model were checked using the Analysis of variance Technique. Hardness is taken as the response and optimum parameters are obtained by using the quadratic model. Based on the results, it can be perceived that the weight percentage of Red mud, ageing temperature and ageing time has shown a notable effect on the response. For a specifically optimized parameter, the hardness is improved and it was observed that ageing temperature is the most influencing factor based on the RSM. The optimized parameters for the desired response are Ageing Temperature is 198.87ᵒC, Ageing time is 6.82884 hours, and Red mud wt % is 4.2865 respectively. A confirmation test is carried out with the optimized parameters experimentally and its error is less than the 5 % which shows good results with RSM. Surface morphological studies are carried for the optimized Age Hardened hybrid composite and it showed the uniform distribution of reinforcements in the matrix. Because of the increased hardness, these hybrid composite would perceive real time applications like Orthopaedic braces, aircraft structures and manufacturing crew machine products.

scholarly journals Quality Enhancement of TIG Welded Al6061 SiCp Composites by Age Hardening Process

2018 ◽  
Vol 15 (3) ◽  
pp. 5573-5582 ◽  
Author(s):  
M. C. G. Shankar ◽  
Jayashree P. K ◽  
S. S. Sharma ◽  
R. Shetty ◽  
K. Vinay
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Weld Zone ◽  
Weight Ratio ◽  
Substantial Improvement ◽  
Age Hardening ◽  
Peak Hardness ◽  
Specific Strength ◽  
Hardening Process ◽  
Peak Aged

Aluminium and its alloys have exceptional corrosion resistant properties, simplicity of fabrication and extraordinary specific strength-to-weight ratio. The main objective of this study is to explore the effect of age hardening on the mechanical properties of tungsten inert gas (TIG) welded joints of the composite. This study highlights the enrichment in mechanical properties like hardness and tensile strength of TIG welded Al6061-SiC composites. A single-pass TIG welding using 5356 filler material is carried out on the composite with varying percentages of SiC having 25 µm. The hardness and tensile strength of the weld zone in as-weld condition is measured. The samples are then subjected to age hardening treatment at different temperatures and the peak hardness values are determined. The tensile strength is noted, and these values are compared with the values of the as-weld condition. The microstructure of the fracture surface in as-weld and peak aged condition is taken and the type of failure mode is found out. X-ray diffraction (XRD) spectra of the peak-aged sample is also considered for the analysis. The results indicated that there was significant influence leading to substantial improvement of hardness and tensile strength values of the samples after the age hardening process.

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