No abstract

The current work aims to investigate the mechanical properties of rare oxide reinforced Mg alloy based MMCs. Magnesium matrix considered in the study is AZ91D alloy, whereas rare earth oxides reinforced were CeO2 and Y2O3. The Y2O3 particulate reinforcement percentage was varied from 1 to 3% in the steps of 1% to study its influence on mechanical properties of MMCs. Stir casting route was adopted to fabricate sample for study. Microstructure analysis illustrated the uniform distribution of particulate in matrix alloys. The obtained results revealed the enhanced mechanical properties such as tensile strength, yield strength, elongation and hardness of MMCs due to increased percentage of reinforcement. Fractography analysis of fracture surfaces demonstrated the microcracks and cleavage were dominant in pure alloy. While particle debonding, extensive plastics deformation were prominent in-addition to microcracks in MMCs.

No abstract

No abstract

The present experimental study is to evaluate the performance of coated HSS tools during drilling of different hardness EN8 alloy. Four PVD coated HSS tools are used to drill different hardness specimen. ANOVA analysis of surface roughness, thrust force and tool is carried out for optimising the process. Results indicated that the tool 2 with R2 composition of TiSiNo+AP [AlCrN] performs better with respect to better surface finish thrust force and tool wear. It was found that, the favorable performance of the tools are in the order of tool 1,4 and 3 with composition of (TiSiNo[AlTiN/TiSiN]), (FTR[TiAlNmultilayer],+AP[AlCrN]) and (FTR[TiAlN multilayer]) respectively. Lowest and highest surface roughness is obtained for tool 2 and tool 3 with values of 1.55 and 1.85 micrometer, respectively. Also, minimum and maximum thrust force is obtained for tool 2 and tool 3 with 27 and 35 N respectively. Additionally, normal probability plot depict lower and higher thrust force for tool 2 and 3. During drilling tool 3 had resulted in higher tool wear accounting 68.69% while that of tool 2 remained 66.26%. The normal probability plot of tool 2 compared to tool 3 had 15% difference in contribution to quality of the machined alloy.