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| 1 | Nanoindentation and Wear Characteristics of Al 5083/SiC_p Nanocomposites Synthesized by High Energy Ball Milling and Spark Plasma Sintering显示文摘Al 5083/10 wt% SiC p nano composites have been synthesized by means of high energy ball milling followed by spark plasma sintering (SPS). Nano composites produced via this method exhibited near-theoretical density while retaining the nano-grained features. X-ray diffraction (XRD) analysis indicated that the crystalline size of the ball milled Al 5083 matrix was observed to be ~25 nm and it was coarsened up to ~30 nm after SPS. Nano indentation results of nano composites demonstrated a high hardness of ~280 HV with an elastic modulus of 126 GPa. Wear and friction characteristics with addition of SiC p reinforcement exhibited significant improvement in terms of coefficient of friction and specific wear rate to that of nano structured Al 5083 alloy. The reduction in specific wear rate in the nanocomposite was mainly due to the change of wear mechanism from adhesive to abrasive wear with the addition of SiC p which resulted in high hardness associated with nano-grained microstructure. | Sivaiah Bathula Saravanan M Ajay Dhar | 2012 | Journal of Materials Science & Technology2012，28，11： | 3 |
| 2 | Enhanced thermoelectric performance in p-type ZrCoSb based half-Heusler alloys employing nanostructuring and compositional modulation显示文摘ZrCoSb based half-Heusler(HH)alloys have been widely studied as a p-type thermoelectric(TE)material for power generation applications in the mid-temperature regime.However,their intrinsically high thermal conductivity has been found to be detrimental for the improvement in their thermoelectric figure-of-merit(ZT),which presently is far below unity.In the current work,a state-of-the-art ZT~1.1 at 873 K was realized in an optimized composition of nanostructured Zr1-xHfxCoSb_(0.9)Sn_(0.1) HH alloys by employing compositional modulation i.e.grain-by-grain compositional variations,which leads to a substantial increase in its power factor coupled with a concurrent decrease in its thermal conductivity.Significant reduction in the phonon mean-free-path is observed on Hf substitution,which is comparable to the average crystallite size(~25 nm),thus leading to a very low thermal conductivity of~2.2Wm^(-1)K^(-1) at 873 K,which is amongst the lowest reported in HH alloys.The TE device characteristics,estimated using cumulative temperature dependence model for quantitative evaluation of TE performance,yielded an output power density of~10 Wcm2 with a leg efficiency of~10%in the optimized composition of nanostructured Zr_(1-x)Hf_(x)CoSb_(0.9)Sn_(0.1) HH alloys,which is comparable to the reported efficiencies of other state-of-the-art TE materials. | Nagendra S.Chauhan Sivaiah Bathula Avinash Vishwakarma Ruchi Bhardwaj Kishor Kumar Johari Bhasker Gahtori Ajay Dhar | 2019 | Journal of Materiomics2019，5，1： | 3 |
| 3 | Microstructural features and mechanical properties of Al 5083/SiC p metal matrix nanocomposites produced by high energy ball milling and spark plasma sintering显示文摘 | Sivaiah Bathula R.C. Anandani Ajay Dhar A.K. Srivastava | 2012 | Materials Science & Engineering A2012，，： | 1 |
| 4 | High-pressure sintering of cubic boron nitridc显示文摘 | Bindal M M Nayar R K Singhal S K AJAY DHAR RAJEEV CHOPRA | 1986 | Journal of Materials Science1986，，21： | 1 |
| 5 | A prospective evaluation of hemodynamic instability during off-pump coronary artery bypass surgery显示文摘 | Manisha Mishra Shipra Shrivastava Ajay Dhar Ramesh Bapna Anil Mishra Zile Singh Meharwal Naresh Trehan | 2003 | Journal of Cardiothoracic and Vascular Anesthesia2003，，4： | 1 |
| 6 | Segment III Cholangiojejunostomy for Carcinoma of the Gallbladder显示文摘 | Adarsh Chaudhary Puneet Dhar Sudhir Tomey Ajay Sachdev Anil Agarwal | 1997 | World Journal of Surgery1997，，8： | 1 |
| 7 | Modeling opti-mal release policy under fuzzy paradigm in imperfect debuggingenvironment显示文摘 | Pachauri Bhoopendra Kumar Ajay Dhar Joydip | 2013 | Information and Software Technology2013，55，11： | 1 |
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