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On the contribution of boundaries towards strength in oxygen free high conductivity copper subjected to repetitive upsetting–extrusion

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Progress in Natural Science:Materials international 2016年第6期26卷 621-629页

作者： K.Sahithya i.balasundar Vajinder Singh P.Ghosal T.Raghu Near Net Shape Group Aeronautical Materials Division Defence Metallurgical Research Laboratory Kanchanbagh Post Electron Microscopy Group Material Science Division Defence Metallurgical Research Laboratory Kanchanbagh Post

Oxygen free high conductivity(OFHC) copper was subjected to 1, 5, 10, 15 and 20 cycles of repetitive upsetting and extrusion(RUE) process at room temperature. Microstructure and microhardness in the RUE processed material were evaluated at specific locations and correlated with the equivalent plastic strain. The microhardness of the material was found to be independent of strain or number of RUE cycles at certain locations whereas it exhibited strain softening behaviour at certain locations even though significant grain refinement was achieved. This difference in behaviour is attributed to the varied strength contribution from different types of boundaries present in the material after deformation.

关键词： Severe plastic deformation OFHC Copper RUE EBSD

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Modeling the hot working behavior of near-α titanium alloy iMi 834

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Progress in Natural Science:Materials international 2013年第6期23卷 598-607页

作者： i.balasundar T.Raghu B.P.Kashyap Near Net Shape Group Aeronautical Materials DivisionDefence Metallurgical Research Laboratory Department of Metallurgical Engineering and Materials Science Indian Institute of Technology Bombay

The hot working behavior of near-a titanium alloy iMi 834 with a duplex starting microstructure was studied using the technique of processing *** processing map was interpreted in terms of the microstrucmral processes occurring during deformation,based on the values of dimensionless parameter η which represents the energy dissipation through microstructural *** instability criterion(ξied to demarcate the flow instability regions in the processing *** the parameters(η and ξ) were computed using the experimental data generated by carrying out hot compression tests over a range of temperatures(850-1060℃) and strain rates(3×10-1/s).The deterministic domains observed under the investigated temperature and strain rate conditions were attributed to continuous dynamic recrystallization or globularisation of a lamellae,dynamic recrystallization and growth of β grains through microstructural *** unified strain compensated constitutive equation was established to describe the hot working behavior of the material in the selected temperature-strain rate *** established constitutive equation was validated using standard statistical parameters such as correlation coefficient and average absolute relative error.

关键词： Titanium alloys iMi 834 Hot working Processing maps Constitutive modeling

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Mechanical and wear behaviour of Mg-SiC-Gr hybrid composites

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Journal of Magnesium and Alloys 2016年第3期4卷 197-206页

作者： K.Soorya Prakash P.balasundar S.Nagaraja P.M.Gopal V.Kavimani department of mechanical engineering anna university regional campuscoimbatore-641046tamil naduindia department of mechanical engineering rajalakshmi institute of technologychennai-600124tamil naduindia department of mechanical engineering sns college of engineeringcoimbatore-641107tamil naduindia

The present research deals with development and characterisation of magnesium–SiC–Gr hybrid composites through powder metallurgy *** analysis of the magnesium and reinforcement powder particles has been carried out using particle size analyser(PSA)and X-ray diffraction(XRD),and then the mixed powders were analysed through scanning electron microscope(SEM).The developed composite exhibit increased hardness when compared to base material,which could be attributed to the presence of hard ***,a slight decrease in hardness is observed for the hybrid composite when compared to Mg–SiC composite due to the presence of soft Gr *** tribological properties of the developed composite materials were investigated using pin-on-disc wear test apparatus under dry sliding *** wear resistance of the developed composites improved significantly than that of the magnesium matrix due to the upright effect offered by both of the *** SEM analysis was carried out on the worn out surfaces for better understanding of wear mechanisms.5%Gr reinforced Mg-10SiC composites confer better wear resistance among the developed composites.

关键词： Magnesium Hybrid composites Powder metallurgy Sliding wear

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Effect of nano-silver on microstructure, mechanical and tribological properties of cast 6061 aluminum alloy

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Transactions of Nonferrous Metals Society of China 2017年第10期27卷 2137-2145页

作者： G.PiTCHAYYAPiLLAi P.SEENiKANNAN P.balasundar P.NARAYANASAMY Department of Mechanical Engineering Sethu Institute TechnologyKariapatti Virudhunagar 626 115 Tamilnadu India Department of Mechanical Engineering Rajalakshmi Institute of TechnologyChennai 600 124 Tamil Nadu India Department of Mechanical Engineering Kamaraj College of Engineering and TechnologyVirudhunagar 626 001 Tamil Nadu India

Al6061matrix with different amounts of nano-silver(1%and2%)was produced by stir-casting *** were characterized by hardness,tensile,compression and wear *** hardness of the specimens at room temperature wasmeasured by Brinnell hardness testing *** magnitude of hardness increased evidently with the function of the mass fractionof the nano-Ag *** polished specimens were examined with an optical *** fracture surfaces of tensile andcompressive specimens were further examined by scanning electron *** mechanisms were discussed based on thescanning electron microscopy observations of worn surface and wear debris *** is an increase in compressivestrength,ultimate tensile strength,elongation and wear resistance of the Al?Ag composites compared with base *** executionof stir-casting technique is relatively homogenous and fine microstructure which improves the addition of reinforcement material inthe molten *** results show that Al6061?nano-silver which is the best combination of hardness can replace the conventionalmaterial for better performance and longer life.

关键词： Al6061 alloy nano silver stir casting mechanical properties tribological properties

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