caa a22 4500 463230906 CHVBK 20180405153241.0 cr unu---uuuuu 170326e20070301xx s 000 0 eng 10.1007/s10853-006-0987-6 doi (NATIONALLICENCE)springer-10.1007/s10853-006-0987-6 Nanoparticle consolidation using equal channel angular extrusion at room temperature [Elektronische Daten] [I. Karaman, M. Haouaoui, H. Maier] In the present work, we demonstrate the use of equal channel angular extrusion (ECAE) for the consolidation of metallic nanoparticles at room temperature as a bottom up approach to fabricating nanocrystalline (NC) metals. Three different initial average particle sizes of pure copper were used: −325 mesh micron size particles, 130nm and 100nm nanoparticles. The processing work was divided into three major stages (Stages I-III), depending on the powder filling procedure used prior to ECAE, to investigate the effect of processing parameters such as extrusion rate and ECAE route, powder filling environment, and hydrostatic pressure on the final performance of the consolidates. Microstructure of the consolidates and monotonic mechanical behavior were determined at room temperature. The Stage I experiments revealed what can materials, ECAE routes and range of extrusion rates to use for achieving near full density consolidates. In Stages II and III, the effect of initial compact density on the resulting mechanical behavior was investigated. It was found that the prior compaction is helpful in breaking down the initial nanoparticle agglomerates and achieving high tensile strength and ductility levels in the ECAE consolidates. Tensile strength as high as 800MPa and tensile ductility as high as 7% were achieved in 100nm Cu particle consolidates, which were more than 1.5cm in diameter and 10cm in length, with a bimodal grain size distribution in the range of 50-100nm and 300nm-600nm. ECAE was also used to consolidate 316L stainless steel nanoparticles resulting in bulk samples with tensile strength of 1180MPa and 4% ductility. The present study shows that ECAE can be a feasible method for fabricating bulk NC materials with all dimensions in the centimeter range. Future work is needed to further optimize the processing parameters for improving the ductility level further and controlling the grain size distribution. Springer Science+Business Media, LLC, 2006 Karaman I. Department of Mechanical Engineering, Texas A&M University, 77843, College Station, TX, USA aut Haouaoui M. Department of Mechanical Engineering, Texas A&M University, 77843, College Station, TX, USA aut Maier H. Lehrstuhl für Werkstoffkunde, University of Paderborn, 33098, Paderborn, Germany aut Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/5(2007-03-01), 1561-1576 0022-2461 42:5<1561 2007 42 10853 https://doi.org/10.1007/s10853-006-0987-6 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10853-006-0987-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Karaman I. Department of Mechanical Engineering, Texas A&M University, 77843, College Station, TX, USA aut NATIONALLICENCE 700 1- Haouaoui M. Department of Mechanical Engineering, Texas A&M University, 77843, College Station, TX, USA aut NATIONALLICENCE 700 1- Maier H. Lehrstuhl für Werkstoffkunde, University of Paderborn, 33098, Paderborn, Germany aut NATIONALLICENCE 773 0- Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/5(2007-03-01), 1561-1576 0022-2461 42:5<1561 2007 42 10853 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer