Developments in Processing by Severe Plastic Deformation at the 3rd Pan American Materials Congress

JOM, Aug 2017

The 3rd Pan American Materials Congress in San Diego, California, February 26–March 2, 2017, provided an opportunity to bring together many participants working in the field of severe plastic deformation. This article provides a brief review of these activities.

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Developments in Processing by Severe Plastic Deformation at the 3rd Pan American Materials Congress

Developments in Processing by Severe Plastic Deformation at the 3rd Pan American Materials Congress ROBERTO B. FIGUEIREDO 0 MEGUMI KAWASAKI 0 TERENCE G. LANGDON 0 0 1.-Universidade Federal de Minas Gerais , Belo Horizonte , Brazil. 2.-Oregon State University , Corvallis, OR , USA. 3.-University of Southern California , Los Angeles, CA, USA. 4.- The 3rd Pan American Materials Congress in San Diego, California, February 26-March 2, 2017, provided an opportunity to bring together many participants working in the field of severe plastic deformation. This article provides a brief review of these activities. INTRODUCTION The Pan American Materials Congress was initially established with a meeting in Brazil in 2010 and then a second meeting, also in Brazil, in 2014. This 3rd Pan American Congress was different because it was held in San Diego, California, on February 26–March 2, 2017, as part of the TMS 2017 Annual Meeting and Exhibition (TMS2017). The Congress was specifically designed to bring together a large number of participants from countries throughout the Americas and join with TMS2017 to provide an opportunity for participation by active researchers from many countries around the world. Because of the large worldwide interest in the processing of ultrafine-grained metals through the application of severe plastic deformation (SPD), and especially because of the high participation in a symposium on this topic at the 2nd Pan American Congress in Brazil in 2014, it was decided to develop a symposium in San Diego on ‘‘Nanocrystalline Ultrafine Grain Materials and Bulk Metallic Glasses.’’ This symposium was an outstanding success with a total of 53 papers accepted for oral presentation and an additional 9 papers accepted for presentation as posters. The following brief article describes some of the developments in SPD research in the Americas. SPD RESEARCH IN THE AMERICAS A general conclusion from a review of the titles of papers presented at this symposium is that many (if not all) of the topics of considerable current interest to worldwide researchers in the field of SPD processing are now under active consideration and evaluation in the Americas. Thus, it is clear that these countries are now making an important contribution to our overall understanding of the SPD process and in the development of materials with submicrometer and nanometer grain sizes. For example, there is now much interest in examining the strengthening and weakening that may occur in different materials when processed to produce ultrafine grains. Although SPD processing produces significant grain refinement and this generally leads to a strengthening of the bulk solid, it is now apparent that there are examples where the material is weakened by SPD rather than strengthened. This may occur if, for example, the hardening precipitates within the crystalline matrix become fragmented as a result of the very high pressure imposed in the SPD processing.1 This topic of hardening/weakening has been addressed in detail in several recent publications,2,3 and it was examined in a comprehensive experimental investigation by Gabriel Torres Villasen˜ or and his colleagues at the Universidad Nacional Auto´noma de Mexico (UNAM). Specifically, tests were conducted to investigate these hardening and weakening effects in a Zn-21% Al-2% Cu alloy processed by equal-channel angular pressing (ECAP). There were also other reports from Mexico on processing by ECAP including research on the AA6061 alloy by Carlos Reyes Ruiz at UNAM and on the 2014 and 5083 Al alloys by E. Garcia-Sanchez at the Universidad Auto´noma de Nuevo Leo´n. A detailed report by Jorge Cubero-Sesin of the Instituto Tecnolo´gico de Costa Rica provided information on the microstructural evolution occurring in a Ti-6% Al-7% Nb alloy after processing by highpressure torsion (HPT). Microstructural evolution during and after HPT is again a topic of considerable current interest within the SPD community,4 and this presentation dealt specifically with a material of considerable interest for use in orthopedic applications and as dental prostheses. A review from several years ago showed there is a significant interest in SPD processing in Brazil,5 and this was further supported by several papers presented at this symposium. Roberto Figueiredo of the Universidade Federal de Minas Gerais described research on the biocompatibility and corrosion of pure Mg using processing by both ECAP and HPT; a report on some of these results was published almost simultaneously with the Pan American Congress.6 Other reports from the Universidade Federal de Sa˜ o Carlos in Brazil extended the processing techniques to accumulative roll-bonding (ARB) of an AA1050 aluminum alloy by Andrea Kliauga and her colleagues and cyclic closed-die forming of pure copper at room temperature and subzero temperatures by Vitor Sordi and his colleagues. Processing by HPT was also reported by Diana Marulanda Cardona of the Universidad Antonio Narin˜ o in Bogota´ , Colombia, by experiments in which it was shown that it is possible to process successfully a hard AISI 1020 low-carbon steel. After processing, this material was investigated using scanning electron microscopy, x-ray diffraction, and microhardness measurements. CONCLUSION The Pan American symposium on SPD processing and bulk nanostructured materials attracted much interest at the TMS annual meeting in San Diego in February–March 2017. The symposium was a great success with many presentations by active researchers in the Americas and many countries all over the world, and with these presentations demonstrating advanced techniques of SPD processing and characterization and documenting innovative studies on the superior properties of ultrafine-grained materials. It is clear that researchers are making important contributions to this area of materials science throughout the Americas, and there is no doubt that their publications will become of increasing importance in the future. Accordingly, we await with interest the many presentations that will be forthcoming at the 4th Pan American Congress to be held in Monterey, Mexico, in 2019. ACKNOWLEDGEMENTS This work was supported in part by FAPEMIG under Grant APQ-03888-14 (RBF), in part by the NRF Korea funded by MoE under Grant NRF2016R1A6A1A03013422 (MK) and in part by the National Science Foundation of the United States under Grant DMR-1160966 (TGL). 1. C. Xu , M. Furukawa , Z. Horita , and T.G. Langdon, Acta Mater. 53 , 749 ( 2005 ). 2. M. Kawasaki , J. Mater . Sci. 49 , 18 ( 2014 ). 3. T.G. Langdon, Kovove Mater. 53 , 213 ( 2015 ). 4. S.A. Alsubaie , P. Bazarnik , M. Lewandowska , Y. Huang , and T.G. Langdon , J. Mater . Res. Technol . 5 , 152 ( 2016 ). 5. R.B. Figueiredo and T.G. Langdon , J. Mater . Res. Technol . 1 , 55 ( 2012 ). 6. C.L.P. Silva , A.C. Oliveira , C.G.F. Costa , R.B. Figueiredo , M. de Fa´tima Leite, M.M. Pereira , V.F.C. Lins , and T.G. Langdon , J. Mater . Sci. 52 , 5992 ( 2017 ).


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Roberto B. Figueiredo, Megumi Kawasaki, Terence G. Langdon. Developments in Processing by Severe Plastic Deformation at the 3rd Pan American Materials Congress, JOM, 2017, 1-2, DOI: 10.1007/s11837-017-2500-x