신소재공학과

Seminar

Date 20161018 

■ Topic : Formation of bulk nanocrystalline hybrid metals under high pressure
                   
■ Speaker : Prof. Megumi Kawasaki (Dept. of MSE, Hanyang Univ.)

 

■ Invitation : Prof. Hyuck Mo Lee


■ Date & Time : October 18 (Tue) 16:00


■ Venue : KAIST Applied Engineering B/D(W1), Multimedia Lecture Hall (1st Floor)


■ Abstract :

Processing of metals through the application of severe plastic deformation (SPD) provides an opportunity for achieving ultrafine grains in the submicrometer or even the nanometer range. Provided these grains in the bulk metals usually show superior mechanical and physical properties. In practice, the strength at ambient temperatures is dictated through the Hall-Petch relationship in which the yield stress varies inversely with the grain size raised to a power of one-half, so that strength increases as the grain size is reduced. At high temperatures, in the regime where diffusion becomes important, there is a potential for achieving superplastic flow and a superplastic forming capability in materials having very small grain sizes. Several SPD methods are now available but the most promising appear to be Equal-Channel Angular Pressing (ECAP) and High-Pressure Torsion (HPT). This presentation examines these procedures with special emphasis on evolution of microstructure and the mechanical properties of the ultrafine-grained (UFG) materials and bulk nanostructured materials (BNM) processed by these SPD techniques.  


     


No. Subject Author Date Views
Notice 5/30 (Tue) Prof. Chang Hyeon Ko (Sookmyung Univ) ADMINI 2017.05.26 36
198 11/1(Tue) Prof. Seung Hwan Ko (Dept. of ME, Seoul National Univ.) ADMINI 2016.11.01 679
197 [Special Seminar] 10/19(Wed), Prof. Wei-Chuan Shih (Departments of Electrical & Computer Engineering, University of Houston) ADMINI 2016.10.18 635
» 10/18(Tue) Prof. Megumi Kawasaki (Dept. of MSE, Hanyang Univ.) ADMINI 2016.10.17 651
195 [Special Seminar] 10/11(Tue), Prof. Leon Abelmann (KIST Europe) ADMINI 2016.10.07 662
194 10/4(Tue) Prof. Junsuk Rho (Dept. of ME/CE, POSTECH) ADMINI 2016.10.04 785
193 10/4(Tue) KAIST Self-Assembly Symposium 2016 file ADMINI 2016.09.30 725
192 [Special Seminar] 9/30(Fri) Mark Ediger (University of Wisconsin-Madison / Department of Chemistry) ADMINI 2016.09.30 667
191 9/27(Tue) Prof. Sungtae Shin (Dept. of DSP, Korea Univ. Sejong Campus) ADMINI 2016.09.23 1193
190 9/20(Tue) Dr. Sang Soo Han, (KIST) ADMINI 2016.09.19 1218
189 9/6(Tue) Prof. Seung Yong Park, (The Nelson Mandela African Institution of Science and Technology, Head of the Department of Materials and Energy Science and Engineering) ADMINI 2016.08.29 1685
188 [Special Seminar] 8/23(Tue) Prof. Ji Hwan Kim (MIT) ADMINI 2016.08.22 1304
187 8/2(Tue) KAIST International MSE Workshop 2016 ADMINI 2016.07.25 2129
186 [Special Seminar] 6/15(Wed) Prof. Chanho Pak (GIST) ADMINI 2016.06.10 1307
185 6/14(Tue) Prof. Haein Yim, (Department of Physics, Sookmyung Women's Univ.) ADMINI 2016.06.09 1363
184 6/7(Tue) Dr. Soongu Kwon, (Center for Nanoparticle Research, Seoul National Univ.& Institute for Basic Science) ADMINI 2016.06.02 1261
183 5/31(Tue) Prof. Dongmok Whang, (School of AMSE, Sungkyunkwan Univ.) ADMINI 2016.05.27 1127
182 [Special Seminar] 6/8(Wed) Prof. Sunghwan Lee (Dept. of Mechanical Engineering, Baylor University) file ADMINI 2016.05.25 1254
181 5/17(Tue) Prof. Jin-Seong Park, (Division of MSE, Hanyang Univ.) ADMINI 2016.05.12 1260
180 5/10(Tue) Prof. Sei Kwang Hahn, (Dept. of MSE, POSTECH) ADMINI 2016.05.05 1264
179 5/3(Tue) Prof. Kwang Ho Kim, (School of MSE, Pusan National Univ.) ADMINI 2016.04.29 1205