Structure and mechanical properties of ball milled TiAl-Cr intermetallics consolidated by hot pressing and pulse plasma sintering

Jan M. Dutkiewicz 2,  Andrzej Michalski 1,  Paweł Kurtyka 3,  Wojciech Maziarz 2

1. Warsaw University of Technology, Faculty of Materials Science and Engineering (InMat), Wołoska 141, Warszawa 02-507, Poland
2. Polish Academy of Sciences, Institute of Metallurgy and Materials Sciences (IMIM PAN), Reymonta 25, Kraków 30-059, Poland
3. Pedagogical Academy, Podchorążych 2, Kraków, Poland

Abstract
The TiAl-Cr alloys compositions were chosen from the g-phase stability region up to maximum 5 at. % chromium. The elemental powders were initially blended to desired composition of Ti-49,Al-49,Cr-2 and Ti-48,Al-47,Cr-5 (numbers indicate at. %). The ball milling process was performed in a high energy planetary mill Fritsch Pulverisette P/4 and detailed study of structure and micro-hardness changes during milling was described in [1].
Two consolidation methods of milled powders were applied: hot pressing at 1000C at 35MPa under argon flow and pulse plasma sintering. The conditions of latter method were optimized for pressure, voltage and pressure measuring temperature and shrinkage during the process. The micro-hardness of consolidated samples was about 860 HV1 and only small differences were observed between samples obtained by both methods. The mean density of pulse plasma sintered compact was about 98 % of theoretical while hot pressed samples had lower density close to 95% of theoretical. The TEM observation of consolidated samples revealed that pulse plasma sintered samples has a grain size in the range of tens of nanometers while the grains in the hot pressed samples are bigger and has size below 1 micron.
The compression tests performed in the temperature range between RT and 900C with deformation rate of 4x10-1s-1 demonstrated differences in ductility and strength of consolidated samples probably due to different level of densification and grains size.


[1] W. Maziarz, M. Fujda, L. Lityńska, J. Dutkiewicz, Microstructure and microhardness changes during ball milling of TiAlCr intermetallics, revived and accepted for publication in Proceeding of Advanced Materials and Technologies Conference, Łódź 2004, Poland
Presentation: oral at E-MRS Fall Meeting 2004, Symposium I, by Jan M. Dutkiewicz
See On-line Journal of E-MRS Fall Meeting 2004
Submitted: 2004-05-20 14:13
Revised:   2005-11-30 16:34
Related papers
  1. TiB_{2}-TiC composites produced from boron, carbon and titanium powders using Pulse Plasma Sintering method
  2. WC-6%Co composites sintered by the reactive Pulse Plasma Sintering method.
  3. Microstructure and magnetic properties of two phase b+g ferromagnetic Co-Ni-Al alloys
  4. Reconstruction of lattice structure of ion-implanted near-surface regions of HgCdTe epitaxial layers
  5. Microstructure changes in two phase β+γ Co-Ni-Al ferromagnetic shape memory alloys in relation to Al/Co ratio
  6. HRTEM and TEM studies of amorphous structures in ZrNiTiCu base alloys obtained by rapid solidification or ball milling
  7. Powder metallurgy technology of NiTi shape memory alloy
  8. Phase and structural transformations in Ti-Ta alloys in wide region of compositions
  9. Nanocrystalline materials manufactured by torsion under pressure of 2 GPa
  10. Search for New Metallic Glass Compositions in NiZrTi Base Alloys Near Multicomponent Eutectic Positions
  11. PULSE PLASMA SINTERING OF A NANOCRYSTALLINE Cu POWDER
  12. NANOCRYSTALLINE Cu-Al_2O_3 COMPOSITES SINTERED BY THE PULSE PLASMA TECHNIQUE
  13. NANOCRYSTALLINE CEMENTED CARBIDES SINTERD BY THE PULSE PLASMA METHOD
  14. NANOCRYSTALLINE NiAl-TiC COMPOSITES SINTERED BY THE PULSE PLASMA METHOD
  15. Nanocrystalline TiAl-V intermetallics hot pressed from mechanically alloyed powders
  16. Nanocrystallization and mechanical properties of the amorphous Ni-Zr-Ti -Al-Cu -Si ribbons.
Google
 
Web science24.com
© 1998-2008 pielaszek research, all rights reserved Powered by the Conference Engine